CVE-2026-78002high7.5

Rsyslog: rsyslog: denial of service via heap buffer overflow in rainerscript replace() function

Impact

Rsyslog has a denial of service vulnerability via heap buffer overflow in the RainerScript replace() function, exploitable by an unauthenticated remote attacker sending specially crafted syslog messages. The vulnerability arises from an incorrect buffer size calculation. Successful exploitation can lead to a denial of service.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

What to do

To mitigate this vulnerability, restrict network access to the rsyslog service to only trusted hosts. This can be achieved by configuring firewall rules to limit incoming connections to UDP and TCP port 514. Alternatively, if remote syslog reception is not required, disable the imudp and imtcp modules in the /etc/rsyslog.conf configuration file. After modifying the rsyslog configuration or firewall rules, the rsyslog service or firewall service must be restarted for the changes to take effect.

redhat guidance

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

Red Hat · redhat

Red Hat Enterprise Linux 10

1 range

redhat version evidence

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unaffected

0:8.2510.0-5.el10_2.2 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux:10.2

Red Hat · redhat

Red Hat Enterprise Linux 10.0 Extended Update Support

1 range

redhat version evidence

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unaffected

0:8.2412.0-1.el10_0.2 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux_eus:10.0

Red Hat · redhat

Red Hat Enterprise Linux 8

1 range

redhat version evidence

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unaffected

0:8.2102.0-15.el8_10.3 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:enterprise_linux:8::appstream

Red Hat · redhat

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

1 range

redhat version evidence

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unaffected

0:8.2102.0-7.el8_6.2 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_aus:8.6::appstreamcpe:/a:redhat:rhel_eus_long_life:8.6::appstream

Red Hat · redhat

Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

1 range

redhat version evidence

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unaffected

0:8.2102.0-7.el8_6.2 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_aus:8.6::appstreamcpe:/a:redhat:rhel_eus_long_life:8.6::appstream

Red Hat · redhat

Red Hat Enterprise Linux 8.8 Telecommunications Update Service

1 range

redhat version evidence

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unaffected

0:8.2102.0-13.el8_8.1 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_e4s:8.8::appstreamcpe:/a:redhat:rhel_tus:8.8::appstream

Red Hat · redhat

Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

1 range

redhat version evidence

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unaffected

0:8.2102.0-13.el8_8.1 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_e4s:8.8::appstreamcpe:/a:redhat:rhel_tus:8.8::appstream

Red Hat · redhat

Red Hat Enterprise Linux 9

1 range

redhat version evidence

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unaffected

0:8.2510.0-2.el9_8.2 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:enterprise_linux:9::appstream

Red Hat · redhat

Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

1 range

redhat version evidence

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unaffected

0:8.2102.0-113.el9_2.3 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_e4s:9.2::appstream

Red Hat · redhat

Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

1 range

redhat version evidence

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unaffected

0:8.2310.0-4.el9_4.2 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_e4s:9.4::appstream

Red Hat · redhat

Red Hat Enterprise Linux 9.6 Extended Update Support

1 range

redhat version evidence

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unaffected

0:8.2412.0-1.el9_6.2 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhel_eus:9.6::appstream

Red Hat · redhat

Red Hat Update Infrastructure 5

1 range

redhat version evidence

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unaffected

1790241900 → before *

rpm versions

Other versions: affected

Product identifiers (CPE)

cpe:/a:redhat:rhui:5::el9

Red Hat · redhat

Red Hat Enterprise Linux 6

0 ranges

redhat version evidence

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Other versions: unaffected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux:6

Red Hat · redhat

Red Hat Enterprise Linux 6

0 ranges

redhat version evidence

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Other versions: unaffected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux:6

Red Hat · redhat

Red Hat Enterprise Linux 7

0 ranges

redhat version evidence

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Other versions: affected

Product identifiers (CPE)

cpe:/o:redhat:enterprise_linux:7

Original source description

A flaw was found in rsyslog. An unauthenticated remote attacker can trigger a heap buffer overflow in the RainerScript replace() function by sending specially crafted syslog messages. This vulnerability arises from an incorrect buffer size calculation during string replacement, causing memory corruption. Successful exploitation can lead to a denial of service (DoS) for the affected system.

Inside the record

Evidence available

Package identity · not supplied

Version evidence

Remediation guidance

Weakness classification

Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-78002

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-131 ↗

Incorrect Calculation of Buffer Size

redhat

Contributing organizations · 3

redhat

Assigning organization

2026-10-30

CISA-ADP

Additional data publisher

2026-08-27

CVE

Additional data publisher

2026-08-29

What changed

Follow changes

CVE · CVE-2026-780022026-10-30

Observed 2026-10-30T18:28:53.134Z · upstream updated 2026-10-30T17:26:55.509Z

Product or version evidence changed

before

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  },
  {
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  },
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  },
  {
    "vendor": "Red Hat",
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  },
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9",
    "platforms": [],
    "versions": [
      {
        "version": "0:8.2510.0-2.el9_8.2",
        "status": "unaffected",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:enterprise_linux:9::appstream"
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  },
  {
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions",
    "platforms": [],
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        "status": "unaffected",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:rhel_e4s:9.4::appstream"
    ],
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "platforms": [],
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    ],
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    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78002"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Update Infrastructure 5",
    "platforms": [],
    "versions": [
      {
        "version": "1790241900",
        "status": "unaffected",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:rhui:5::el9"
    ],
    "source": "redhat",
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 6",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:6"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78002"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 6",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:6"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78002"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 7",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:7"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78002"
  }
]

after

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    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 10",
    "platforms": [],
    "versions": [
      {
        "version": "0:8.2510.0-5.el10_2.2",
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        "versionType": "rpm"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:10.2"
    ],
    "source": "redhat",
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 10.0 Extended Update Support",
    "platforms": [],
    "versions": [
      {
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        "status": "unaffected",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux_eus:10.0"
    ],
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 8",
    "platforms": [],
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    ],
    "defaultStatus": "affected",
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  },
  {
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    "platforms": [],
    "versions": [
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        "lessThan": "*",
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      }
    ],
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    "platforms": [],
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    ],
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
    "platforms": [],
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  },
  {
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    "name": "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
    "platforms": [],
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      }
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      "cpe:/a:redhat:rhel_e4s:8.8::appstream",
      "cpe:/a:redhat:rhel_tus:8.8::appstream"
    ],
    "source": "redhat",
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9",
    "platforms": [],
    "versions": [
      {
        "version": "0:8.2510.0-2.el9_8.2",
        "status": "unaffected",
        "lessThan": "*",
        "versionType": "rpm"
      }
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      "cpe:/a:redhat:enterprise_linux:9::appstream"
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
    "platforms": [],
    "versions": [
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        "version": "0:8.2102.0-113.el9_2.3",
        "status": "unaffected",
        "lessThan": "*",
        "versionType": "rpm"
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    ],
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions",
    "platforms": [],
    "versions": [
      {
        "version": "0:8.2310.0-4.el9_4.2",
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      "cpe:/a:redhat:rhel_e4s:9.4::appstream"
    ],
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "platforms": [],
    "versions": [
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        "lessThan": "*",
        "versionType": "rpm"
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    "cpes": [
      "cpe:/a:redhat:rhel_eus:9.6::appstream"
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Update Infrastructure 5",
    "platforms": [],
    "versions": [
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    "cpes": [
      "cpe:/a:redhat:rhui:5::el9"
    ],
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 6",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
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      "cpe:/o:redhat:enterprise_linux:6"
    ],
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  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 6",
    "platforms": [],
    "versions": [],
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:6"
    ],
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    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78002"
  },
  {
    "vendor": "Red Hat",
    "name": "Red Hat Enterprise Linux 7",
    "platforms": [],
    "versions": [],
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/o:redhat:enterprise_linux:7"
    ],
    "source": "redhat",
    "url": "https://www.cve.org/CVERecord?id=CVE-2026-78002"
  }
]

References changed

before

[
  "https://access.redhat.com/errata/RHSA-2026:69540",
  "https://access.redhat.com/errata/RHSA-2026:69541",
  "https://access.redhat.com/errata/RHSA-2026:71603",
  "https://access.redhat.com/errata/RHSA-2026:80817",
  "https://access.redhat.com/errata/RHSA-2026:81321",
  "https://access.redhat.com/errata/RHSA-2026:84576",
  "https://access.redhat.com/errata/RHSA-2026:86124",
  "https://access.redhat.com/errata/RHSA-2026:87408",
  "https://access.redhat.com/errata/RHSA-2026:90349",
  "https://access.redhat.com/security/cve/CVE-2026-78002",
  "https://bugzilla.redhat.com/show_bug.cgi?id=2521135",
  "https://github.com/rsyslog/rsyslog/security/advisories/GHSA-g72f-gc6v-f2w3",
  "http://www.openwall.com/lists/oss-security/2026/08/29/1"
]

after

[
  "https://access.redhat.com/errata/RHSA-2026:69540",
  "https://access.redhat.com/errata/RHSA-2026:69541",
  "https://access.redhat.com/errata/RHSA-2026:71603",
  "https://access.redhat.com/errata/RHSA-2026:80817",
  "https://access.redhat.com/errata/RHSA-2026:81321",
  "https://access.redhat.com/errata/RHSA-2026:84576",
  "https://access.redhat.com/errata/RHSA-2026:86124",
  "https://access.redhat.com/errata/RHSA-2026:87408",
  "https://access.redhat.com/errata/RHSA-2026:90349",
  "https://access.redhat.com/errata/RHSA-2026:91582",
  "https://access.redhat.com/security/cve/CVE-2026-78002",
  "https://bugzilla.redhat.com/show_bug.cgi?id=2521135",
  "https://github.com/rsyslog/rsyslog/security/advisories/GHSA-g72f-gc6v-f2w3",
  "http://www.openwall.com/lists/oss-security/2026/08/29/1"
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.

References

14 sources

access.redhat.com/errata/RHSA-2026:69540

vendor-advisoryredhat

access.redhat.com/errata/RHSA-2026:69541

vendor-advisoryredhat

access.redhat.com/errata/RHSA-2026:71603

vendor-advisoryredhat

access.redhat.com/errata/RHSA-2026:80817

vendor-advisoryredhat

access.redhat.com/errata/RHSA-2026:81321

vendor-advisoryredhat

access.redhat.com/errata/RHSA-2026:84576

vendor-advisoryredhat

View 8 more references

access.redhat.com/errata/RHSA-2026:86124

vendor-advisoryredhat

access.redhat.com/errata/RHSA-2026:87408

vendor-advisoryredhat

access.redhat.com/errata/RHSA-2026:90349

vendor-advisoryredhat

access.redhat.com/errata/RHSA-2026:91582

vendor-advisoryredhat

access.redhat.com/security/cve/CVE-2026-78002

vdb-entryredhat

bugzilla.redhat.com/show_bug.cgi

issue-trackingredhat

github.com/rsyslog/rsyslog/security/advisories/GHSA-g72f-gc6v-f2w3

Security advisoryredhat

www.openwall.com/lists/oss-security/2026/08/29/1

Security advisoryCVE

Priority and evidence

Not in CISA KEVNo package fix recorded

KEV coverage does not rule out exploitation.

KEV checked 31/10/2026, 15:15:33 UTC

redhat · CVSS:3.1 · 7.5

Assessment vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reading the signals

Severity · CVSS: Technical impact and attack conditions. The headline is the highest imported catalog score; sources may disagree.
Observed exploitation · KEV: An absent or unavailable KEV listing does not establish that exploitation has not occurred.
Predicted exploitation · EPSS: No EPSS estimate available in this record.

CISA-ADP · SSVC

CISA Coordinator · 2026-08-27

Exploitation: none
Automatable: yes
Technical Impact: partial

SSVC describes the publisher’s decision context. Your organization’s exposure and priorities may differ.

Record details

Published: 27/08/2026, 16:12:59 UTC
Modified: 30/10/2026, 17:26:55 UTC
Last imported by cve.new: 30/10/2026, 18:28:53 UTC
Aliases: None recorded

Source evidence

Request a correction or dispute

Start with the assigning organization for this record. Include the CVE ID, the disputed information, and supporting evidence. A dispute does not itself reject a record.

Find the responsible CNA →Official dispute and escalation process ↗

CVE CVE-2026-78002

Enrichment coverage

NVDNot fully checked

GHSANot fully checked

EUVDNot fully checked

EPSSNot fully checked

Sponsored by MoxsoBuild security habits with adaptive training and phishing simulations.View as JSON

Rsyslog: rsyslog: denial of service via heap buffer overflow in rainerscript replace() function

Impact

What to do

Affected packages

Affected products

Red Hat Enterprise Linux 10

affected

unaffected

unknown

Red Hat Enterprise Linux 10.0 Extended Update Support

affected

unaffected

unknown

Red Hat Enterprise Linux 8

affected

unaffected

unknown

Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

affected

unaffected

unknown

Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

affected

unaffected

unknown

Red Hat Enterprise Linux 8.8 Telecommunications Update Service

affected

unaffected

unknown

Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

affected

unaffected

unknown

Red Hat Enterprise Linux 9

affected

unaffected

unknown

Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

affected

unaffected

unknown

Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

affected

unaffected

unknown

Red Hat Enterprise Linux 9.6 Extended Update Support

affected

unaffected

unknown

Red Hat Update Infrastructure 5

affected

unaffected

unknown

Red Hat Enterprise Linux 6

affected

unaffected

unknown

Red Hat Enterprise Linux 6

affected

unaffected

unknown

Red Hat Enterprise Linux 7

affected

unaffected

unknown

Original source description

Inside the record

Evidence available

Original records

Underlying weaknesses

What changed

References