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Fencer Vulns
medium 4.2

CVE-2026-19730 json

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

published 2026-08-13 2 mo ago modified 2026-11-05 3 d ago also GHSA-fx76-2j3w-2mx6 , GO-2026-6588 , EUVD-2026-58187

cvss
4.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits
0
none known

Summary

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).

Patch / fix

  • go github.com/containers/podman/v5 5.8.6
  • Red Hat Red Hat Enterprise Linux 10 7:5.8.2-9.el10_2
  • Red Hat Red Hat Enterprise Linux 9 6:5.8.2-7.el9_8
  • podman Debian 14 5.8.6+ds1-1

debian advisories DEBIAN-CVE-2026-19730

  • podman RHEL 10.2 7:5.8.2-9.el10_2
  • podman-tests RHEL 10.2 7:5.8.2-9.el10_2
  • podman-docker RHEL 10.2 7:5.8.2-9.el10_2
  • podman-remote RHEL 10.2 7:5.8.2-9.el10_2
  • podman RHEL 9 6:5.8.2-7.el9_8
  • podman-tests RHEL 9 6:5.8.2-7.el9_8
  • podman-docker RHEL 9 6:5.8.2-7.el9_8
  • podman-remote RHEL 9 6:5.8.2-7.el9_8

red hat advisories RHSA-2026:70201RHSA-2026:69961

  • podman AlmaLinux 9 6:5.8.2-7.el9_8
  • podman-tests AlmaLinux 9 6:5.8.2-7.el9_8
  • podman-docker AlmaLinux 9 6:5.8.2-7.el9_8
  • podman-remote AlmaLinux 9 6:5.8.2-7.el9_8
  • podman-plugins AlmaLinux 9 6:5.8.2-7.el9_8
  • podman AlmaLinux 10 7:5.8.2-9.el10_2.alma.1
  • podman-tests AlmaLinux 10 7:5.8.2-9.el10_2.alma.1
  • podman-docker AlmaLinux 10 7:5.8.2-9.el10_2.alma.1

almalinux advisories ALSA-2026:69961ALSA-2026:70201

  • podman Rocky Linux 10 7:5.8.2-9.el10_2
  • podman Rocky Linux 9 6:5.8.2-7.el9_8

rocky linux advisories RLSA-2026:70201RLSA-2026:69961

  • podman Alpine 3.24 5.8.6-r0

alpine advisories ALPINE-CVE-2026-19730

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-19730 updated cvss 4.2

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

  • Red Hat Enterprise Linux AppStream (v. 9) podman 5.8.2-7.el9_8, podman-tests 5.8.2-7.el9_8, podman-docker 5.8.2-7.el9_8, podman-remote 5.8.2-7.el9_8, podman-plugins 5.8.2-7.el9_8
    fixed: vendor fix RHSA-2026:69961
  • Red Hat Enterprise Linux AppStream (v. 10) podman 5.8.2-9.el10_2, podman-docker 5.8.2-9.el10_2, podman-remote 5.8.2-9.el10_2 Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) podman-tests 5.8.2-9.el10_2
    fixed: vendor fix RHSA-2026:70201
  • Red Hat Ansible Automation Platform 2 ansible-automation-platform-24/eda-controller-rhel8, ansible-automation-platform-25/eda-controller-rhel8, ansible-automation-platform-26/eda-controller-rhel9, ansible-automation-platform-27/eda-controller-rhel9 Red Hat Enterprise Linux 8 podman, podman-tests, podman-docker, podman-remote, podman-gvproxy, podman-plugins, +2 more Red Hat Hardened Images podman 6.0.2-2.1.hum1 Red Hat OpenShift Container Platform 4 podman, podman-tests, podman-docker, podman-remote, podman-gvproxy, podman-plugins, +3 more Red Hat OpenShift Container Platform 5 podman 6.0.2-2.1.hum1 Red Hat OpenShift Dev Spaces devspaces/udi-rhel9, devspaces/udi-base-rhel9, devspaces/udi-base-rhel10
    +2 more products
    Red Hat OpenShift Virtualization 4 container-native-virtualization/ocp-virt-validation-checkup-rhel9 Red Hat Quay 3 quay/quay-builder-rhel8, quay/quay-builder-rhel9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/podman-container-tools/podman/issues/29013 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 4.2 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L
GitHub 3.1 4.2 CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L

Affected packages

ecosystem package affected fixed in
go github.com/containers/podman/v5
>=5.7.0, <5.8.6
5.8.6
go github.com/containers/podman
all versions
 no fix listed
go github.com/containers/podman/v2
all versions
 no fix listed
go github.com/containers/podman/v3
all versions
 no fix listed
go github.com/containers/podman/v4
all versions
 no fix listed

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Ansible Automation Platform 2
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat OpenShift Container Platform 4
  • Red Hat Red Hat OpenShift Container Platform 5
  • Red Hat Red Hat OpenShift Dev Spaces
  • Red Hat Red Hat OpenShift Virtualization 4
  • Red Hat Red Hat Quay 3

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.