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CVE-2026-19730

Podman: podman: quadlet install --replace non-truncating write retains removed host-access directives

Products / packages Red Hat Enterprise Linux 10 · Red Hat Enterprise Linux 9 · Red Hat Ansible Automation Platform 2 · 7 more

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Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 23:40:32 UTC
redhat · CVSS:3.1 · 4.2
Assessment vectorCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L

Severity

medium4.2

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

Exploit reference published

Source-linked evidence; not proof of attacks in the wild or independent validation.

Remediation

Fix status not established

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

What this means

The 'podman quadlet install --replace' command may retain removed host-access directives from the original Quadlet if the new Quadlet is smaller, potentially leading to undesirable behavior. This issue affects Podman and is caused by a non-truncating write when the initial reflink copy attempt fails. The vulnerable code paths are in quadlet.go and reflink_linux.go.

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.

Red Hat · redhat

Red Hat Enterprise Linux 10

1 range

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affected

unaffected

7:5.8.2-9.el10_2 → before *

rpm versions

unknown

Other versions: affected

Product identifiers (CPE)cpe:/o:redhat:enterprise_linux:10.2

Red Hat · redhat

Red Hat Enterprise Linux 9

1 range

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affected

unaffected

6:5.8.2-7.el9_8 → before *

rpm versions

unknown

Other versions: affected

Product identifiers (CPE)cpe:/a:redhat:enterprise_linux:9::appstream

Red Hat · redhat

Red Hat Ansible Automation Platform 2

0 ranges

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/a:redhat:ansible_automation_platform:2

Red Hat · redhat

Red Hat Ansible Automation Platform 2

0 ranges

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/a:redhat:ansible_automation_platform:2

Red Hat · redhat

Red Hat Ansible Automation Platform 2

0 ranges

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/a:redhat:ansible_automation_platform:2

Red Hat · redhat

Red Hat Ansible Automation Platform 2

0 ranges

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/a:redhat:ansible_automation_platform:2

Red Hat · redhat

Red Hat Enterprise Linux 8

0 ranges

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/a:redhat:enterprise_linux:8

Red Hat · redhat

Red Hat Hardened Images

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/a:redhat:hummingbird:1

Red Hat · redhat

Red Hat OpenShift Container Platform 4

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/a:redhat:openshift:4

Red Hat · redhat

Red Hat OpenShift Container Platform 5

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/a:redhat:openshift:5

Red Hat · redhat

Red Hat OpenShift Dev Spaces

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affected

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unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/a:redhat:openshift_devspaces:3

Red Hat · redhat

Red Hat OpenShift Dev Spaces

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unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/a:redhat:openshift_devspaces:3

Red Hat · redhat

Red Hat OpenShift Dev Spaces

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/a:redhat:openshift_devspaces:3

Red Hat · redhat

Red Hat OpenShift Virtualization 4

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/a:redhat:container_native_virtualization:4

Red Hat · redhat

Red Hat Quay 3

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/a:redhat:quay:3

Red Hat · redhat

Red Hat Quay 3

0 ranges

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affected

unaffected

unknown

Other versions: unaffected

Product identifiers (CPE)cpe:/a:redhat:quay:3
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

The sources identify public exploit references. We have not independently tested them; their availability does not establish exploitation in the wild.

podman-container-tools/podman · issues/29013 ↗Attributed to CISA-ADP

Original source description

Read the full publisher description

The 'podman quadlet install --replace' command opens the existing destination file with O_CREATE|O_WRONLY but omits O_TRUNC. When the initial reflink copy attempt fails (common on non-reflink-capable filesystems including many RHEL default XFS configurations), the fallback in ReflinkOrCopy uses io.Copy which performs a non-truncating write. If the original Quadlet is larger than the new Quadlet, the file is not truncated and content from the original is preserved. The command completes with no warning.

There is no risk of information leakage as the user already had access to the Quadlet in order to replace it, and in most cases, this would only lead to invalid Quadlet files. However, security-related options from the end of the old Quadlet could be included in the new Quadlet, and if the truncation resulted in a valid Quadlet file, this could result in undesirable behavior. For example, running podman quadlet install --replace to remove a single line from the end of a Quadlet - including security-sensitive content, like AddCapability - will fail, and the option will continue to be used. Further, with Volume Quadlets, this can include additional mounts which can cause content to be unintentionally exposed into containers. If, later, the image is updated then compromised content might be leaked to an attacker.

The vulnerable code paths are in pkg/domain/infra/abi/quadlet.go (lines 338-360, O_CREATE|O_WRONLY without O_TRUNC) and vendor/go.podman.io/storage/pkg/fileutils/reflink_linux.go (lines 12-19, non-truncating io.Copy fallback).

References

6 sources

Inside the record

Evidence available

Package identity · not supplied
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-2026-19730

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-459 ↗

Incomplete Cleanup

redhat

Related →
Contributing organizations · 2
redhat

Assigning organization

2026-11-05
CISA-ADP

Additional data publisher

2026-08-13

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-2026-19730

    Observed 2026-11-05T19:39:12.048Z · upstream updated 2026-11-05T19:26:51.103Z

    Product or version evidence changed

    before

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    after

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    ]

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

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