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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-19730
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-13 18:17:25 UTC
Updated2026-08-13 19:17:19 UTC
DescriptionThe '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).

Risk And Classification

Primary CVSS: v3.1 4.2 MEDIUM from [email protected]

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

Problem Types: CWE-459 | CWE-459 Incomplete Cleanup

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.2MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L
3.1CNACVSS4.2MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Ansible Automation Platform 2 Not specified Not specified
CNA Red Hat Red Hat Ansible Automation Platform 2 Not specified Not specified
CNA Red Hat Red Hat Ansible Automation Platform 2 Not specified Not specified
CNA Red Hat Red Hat Ansible Automation Platform 2 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 10 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 8 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 9 Not specified Not specified
CNA Red Hat Red Hat Hardened Images Not specified Not specified
CNA Red Hat Red Hat OpenShift Container Platform 4 Not specified Not specified
CNA Red Hat Red Hat OpenShift Dev Spaces Not specified Not specified
CNA Red Hat Red Hat OpenShift Dev Spaces Not specified Not specified
CNA Red Hat Red Hat OpenShift Dev Spaces Not specified Not specified
CNA Red Hat Red Hat OpenShift Virtualization 4 Not specified Not specified
CNA Red Hat Red Hat Quay 3 Not specified Not specified
CNA Red Hat Red Hat Quay 3 Not specified Not specified

References

ReferenceSourceLinkTags
github.com/podman-container-tools/podman/security/advisories/GHSA-fx76-2... [email protected] github.com
access.redhat.com/security/cve/CVE-2026-19730 [email protected] access.redhat.com
bugzilla.redhat.com/show_bug.cgi [email protected] bugzilla.redhat.com
github.com/podman-container-tools/podman/issues/29013 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Red Hat would like to thank Christopher Lusk (North Echo Security Research) and Paul Holzinger (Podman) for reporting this issue. (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-07-19T00:00:00.000ZReported to Red Hat.
CNA2026-08-10T00:00:00.000ZMade public.

Workarounds

CNA: Patches available at https://github.com/podman-container-tools/podman/commit/a38a9b7d20915c55e6f3c451101ae72d6da33742 for versions 5.8.6 and 6.0.0. If patches cannot be used, possible workarounds are to manually copy the quadlet files to the quadlet directory or remove the destination file before running 'podman quadlet install' (without --replace).

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