# CVE-2026-19730: podman: The 'podman quadlet install --replace' command opens the existing destination file with O_CREATE|O_WRONLY but omits O... CVE-2026-19730 is fixed in 5 products on 1 platform, first by RHSA-2026:70201, released August 18, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-19730 - Priority: High - CVSS: 8.8 (medium) - EPSS: 0.0013 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Aug 10, 2026 ## 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). ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | podman Debian 14 | 5.8.6+ds1-1 | [DEBIAN-CVE-2026-19730](https://patchblox.com/security/data/fix/linux/debian-cve-2026-19730.md) | Aug 31, 2026 | | Linux | podman RHEL 10 | 5.8.2-9.el10_2 | [RHSA-2026:70201](https://patchblox.com/security/data/fix/linux/rhsa-2026-70201.md) | Aug 18, 2026 | | Linux | podman RHEL 9 | 6:5.8.2-7.el9_8 | [RHSA-2026:69961](https://patchblox.com/security/data/fix/linux/rhsa-2026-69961.md) | Sep 23, 2026 | | Linux | podman almalinux 10 | 7:5.8.2-9.el10_2.alma.1 | [ALSA-2026:70201](https://patchblox.com/security/data/fix/linux/alsa-2026-70201.md) | Sep 22, 2026 | | Linux | podman almalinux 9 | 6:5.8.2-7.el9_8 | [ALSA-2026:69961](https://patchblox.com/security/data/fix/linux/alsa-2026-69961.md) | Sep 22, 2026 | | Linux | podman ol 10 | 7:5.8.2-9.0.1.el10_2 | [ELSA-2026-70201](https://patchblox.com/security/data/fix/linux/elsa-2026-70201.md) | Sep 23, 2026 | | Linux | podman ol 9 | 6:5.8.2-7.0.1.el9_8 | [ELSA-2026-69961](https://patchblox.com/security/data/fix/linux/elsa-2026-69961.md) | Sep 23, 2026 | | Linux | podman rocky 10 | 7:5.8.2-9.el10_2 | [RLSA-2026:70201](https://patchblox.com/security/data/fix/linux/rlsa-2026-70201.md) | Sep 23, 2026 | | Linux | podman rocky 9 | 6:5.8.2-7.el9_8 | [RLSA-2026:69961](https://patchblox.com/security/data/fix/linux/rlsa-2026-69961.md) | Sep 23, 2026 | | Linux | podman-docker RHEL 9 | 6:5.8.2-7.el9_8 | [RHSA-2026:69961](https://patchblox.com/security/data/fix/linux/rhsa-2026-69961.md) | Sep 23, 2026 | | Linux | podman-docker almalinux 10 | 7:5.8.2-9.el10_2.alma.1 | [ALSA-2026:70201](https://patchblox.com/security/data/fix/linux/alsa-2026-70201.md) | Sep 22, 2026 | | Linux | podman-docker almalinux 9 | 6:5.8.2-7.el9_8 | [ALSA-2026:69961](https://patchblox.com/security/data/fix/linux/alsa-2026-69961.md) | Sep 22, 2026 | | Linux | podman-docker ol 10 | 7:5.8.2-9.0.1.el10_2 | [ELSA-2026-70201](https://patchblox.com/security/data/fix/linux/elsa-2026-70201.md) | Sep 23, 2026 | | Linux | podman-docker ol 9 | 6:5.8.2-7.0.1.el9_8 | [ELSA-2026-69961](https://patchblox.com/security/data/fix/linux/elsa-2026-69961.md) | Sep 23, 2026 | | Linux | podman-plugins RHEL 9 | 6:5.8.2-7.el9_8 | [RHSA-2026:69961](https://patchblox.com/security/data/fix/linux/rhsa-2026-69961.md) | Sep 23, 2026 | | Linux | podman-plugins almalinux 9 | 6:5.8.2-7.el9_8 | [ALSA-2026:69961](https://patchblox.com/security/data/fix/linux/alsa-2026-69961.md) | Sep 22, 2026 | | Linux | podman-plugins ol 9 | 6:5.8.2-7.0.1.el9_8 | [ELSA-2026-69961](https://patchblox.com/security/data/fix/linux/elsa-2026-69961.md) | Sep 23, 2026 | | Linux | podman-remote RHEL 9 | 6:5.8.2-7.el9_8 | [RHSA-2026:69961](https://patchblox.com/security/data/fix/linux/rhsa-2026-69961.md) | Sep 23, 2026 | | Linux | podman-remote almalinux 10 | 7:5.8.2-9.el10_2.alma.1 | [ALSA-2026:70201](https://patchblox.com/security/data/fix/linux/alsa-2026-70201.md) | Sep 22, 2026 | | Linux | podman-remote almalinux 9 | 6:5.8.2-7.el9_8 | [ALSA-2026:69961](https://patchblox.com/security/data/fix/linux/alsa-2026-69961.md) | Sep 22, 2026 | | Linux | podman-remote ol 10 | 7:5.8.2-9.0.1.el10_2 | [ELSA-2026-70201](https://patchblox.com/security/data/fix/linux/elsa-2026-70201.md) | Sep 23, 2026 | | Linux | podman-remote ol 9 | 6:5.8.2-7.0.1.el9_8 | [ELSA-2026-69961](https://patchblox.com/security/data/fix/linux/elsa-2026-69961.md) | Sep 23, 2026 | | Linux | podman-tests RHEL 9 | 6:5.8.2-7.el9_8 | [RHSA-2026:69961](https://patchblox.com/security/data/fix/linux/rhsa-2026-69961.md) | Sep 23, 2026 | | Linux | podman-tests almalinux 10 | 7:5.8.2-9.el10_2.alma.1 | [ALSA-2026:70201](https://patchblox.com/security/data/fix/linux/alsa-2026-70201.md) | Sep 22, 2026 | | Linux | podman-tests almalinux 9 | 6:5.8.2-7.el9_8 | [ALSA-2026:69961](https://patchblox.com/security/data/fix/linux/alsa-2026-69961.md) | Sep 22, 2026 | | Linux | podman-tests ol 10 | 7:5.8.2-9.0.1.el10_2 | [ELSA-2026-70201](https://patchblox.com/security/data/fix/linux/elsa-2026-70201.md) | Sep 23, 2026 | | Linux | podman-tests ol 9 | 6:5.8.2-7.0.1.el9_8 | [ELSA-2026-69961](https://patchblox.com/security/data/fix/linux/elsa-2026-69961.md) | Sep 23, 2026 | --- Data as of 2026-11-08T19:12:23Z UTC. 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