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CVE-2026-123555

Zebra 2.3.0 before 7.0.0 Denial of Service via Unscored Script Verification Failures

Products / packages ZcashFoundation zebra

Published

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Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 15/11/2026, 00:05:31 UTC
VulnCheck · CVSS:4.0 · 8.7
Assessment vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
VulnCheck · CVSS:3.1 · 7.5
Assessment vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The headline uses the highest imported catalog score. Assessments can differ by source and CVSS version.

Severity

high8.7

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

Zebra versions 2.3.0 before 7.0.0 and 1.0.0-beta.46 before 18.0.0 contain a denial of service vulnerability, allowing unauthenticated peers to evade misbehavior scoring. Attackers can flood the mempool or serve forged blocks to exhaust CPU and stall block sync. This is due to improper handling of exceptional conditions.

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

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

ZcashFoundation · VulnCheck

zebra

2 ranges
VulnCheck version evidence

Package identity

pkg:cargo/zebradExplore zebrad →

Identity supplied by VulnCheck. Version matching requires compatible range evidence.

Compare with this publisher’s ranges. This does not inspect your installation.

affected

2.3.0 → before 7.0.0

semver versions

unaffected

7.0.0

semver versions

unknown

Other versions: unaffected

ZcashFoundation · VulnCheck

zebra

2 ranges
VulnCheck version evidence

Package identity

pkg:cargo/zebra-consensusExplore zebra-consensus →

Identity supplied by VulnCheck. Version matching requires compatible range evidence.

Compare with this publisher’s ranges. This does not inspect your installation.

affected

1.0.0-beta.46 → before 18.0.0

semver versions

unaffected

18.0.0

semver versions

unknown

Other versions: unaffected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

Zebra from 2.3.0 before 7.0.0 contains a denial of service vulnerability that allows unauthenticated peers to evade misbehavior scoring by sending transactions or blocks with invalid transparent scripts. Attackers can flood mempool with script-failing transactions or serve forged v5 block bodies with altered scriptSig bytes to exhaust CPU and repeatedly stall block sync.

References

3 sources
ZcashFoundation/zebra · security/advisories/GHSA-jq45-ghw5-v37x
Vendor advisoryVulnCheck
ZcashFoundation/zebra · commit e8db87e
PatchVulnCheck
www.vulncheck.com/advisories/zebra-2.3.0-before-7.0.0-denial-of-service-via-unscored-script-verification-failures
Security advisoryVulnCheck

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

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

Original records

CVE-2026-123555

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-755 ↗

Improper Handling of Exceptional Conditions

VulnCheck

Related →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

VulnCheck · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:a:zfnd:zebra:*:*:*:*:*:*:*:*

From (inclusive): 2.3.0

Before: 7.0.0

Vulnerable product

cpe:2.3:a:zfnd:zebra:*:*:*:*:*:*:*:*

From (inclusive): 1.0.0-beta.46

Before: 18.0.0

Applicability preview
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:zfnd:zebra:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "2.3.0",
            "versionEndExcluding": "7.0.0"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:zfnd:zebra:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "1.0.0-beta.46",
            "versionEndExcluding": "18.0.0"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 2
VulnCheck

Assigning organization

2026-11-08
CISA-ADP

Additional data publisher

2026-11-13

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
  1. CVE · CVE-2026-123555

    Observed 2026-11-13T07:16:45.622Z · upstream updated 2026-11-13T03:02:08.303Z

    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-11-13T03:01:56.391913Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "yes"
      },
      {
        "name": "Technical Impact",
        "value": "partial"
      }
    ]
  }
]

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

Showing up to 50 most recent observed changes.