CVE-2026-19730Podman: podman: quadlet install --replace non-truncating write retains removed host-access directives
Updated under an hour ago ()
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It affects Red Hat Enterprise Linux 10 and 6 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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).
- CVSS
- 4.2 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L
- Weakness (CWE)
- CWE-459
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- redhat
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 1, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 7:5.8.2-9.el10_2 not affected | CNA record |
Red Hat Red Hat Ansible Automation Platform 2 redhat:ansible_automation_platform | 2 | CNA record |
Red Hat Red Hat Hardened Images redhat:hummingbird | 1 | CNA record |
Red Hat Red Hat OpenShift Container Platform 4 redhat:openshift | 4 | CNA record |
Red Hat Red Hat OpenShift Dev Spaces redhat:openshift_devspaces | 3 | CNA record |
Red Hat Red Hat OpenShift Virtualization 4 redhat:container_native_virtualization | 4 | CNA record |
Red Hat Red Hat Quay 3 redhat:quay | 3 | CNA record |
References
- https://access.redhat.com/errata/RHSA-2026:69961vendor-advisory, x-refsource-redhat
- https://access.redhat.com/errata/RHSA-2026:70201vendor-advisory, x-refsource-redhat
- https://access.redhat.com/security/cve/CVE-2026-19730vdb-entry, x-refsource-redhat
- https://bugzilla.redhat.com/show_bug.cgi?id=2508234issue-tracking, x-refsource-redhat
- https://github.com/podman-container-tools/podman/issues/29013
- https://github.com/podman-container-tools/podman/security/advisories/GHSA-fx76-2j3w-2mx6
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.