Podman: podman: quadlet install --replace non-truncating write retains removed host-access directives
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat.
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).
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | — | 7:5.8.2-9.el10_2 | Patch available | CNA |
| Red Hat | Red Hat Enterprise Linux 9 | — | 6:5.8.2-7.el9_8 | Patch available | CNA |
| Red Hat | Red Hat Ansible Automation Platform 2 | — | — | Not affected | CNA |
| Red Hat | Red Hat Ansible Automation Platform 2 | — | — | Not affected | CNA |
| Red Hat | Red Hat Ansible Automation Platform 2 | — | — | Not affected | CNA |
| Red Hat | Red Hat Ansible Automation Platform 2 | — | — | Not affected | CNA |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | Not affected | CNA |
| Red Hat | Red Hat Hardened Images | — | — | Not affected | CNA |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — | Not affected | CNA |
| Red Hat | Red Hat OpenShift Container Platform 5 | — | — | Not affected | CNA |
| Red Hat | Red Hat OpenShift Dev Spaces | — | — | Not affected | CNA |
| Red Hat | Red Hat OpenShift Dev Spaces | — | — | Not affected | CNA |
| Red Hat | Red Hat OpenShift Dev Spaces | — | — | Not affected | CNA |
| Red Hat | Red Hat OpenShift Virtualization 4 | — | — | Not affected | CNA |
| Red Hat | Red Hat Quay 3 | — | — | Not affected | CNA |
| Red Hat | Red Hat Quay 3 | — | — | Not affected | CNA |
| — | github.com/containers/podman/v5 (Go) | 5.7.0 to before 5.8.6 | 5.8.6 | Patch available | GHSA-fx76-2j3w-2mx6 |
- Red Hat Enterprise Linux 10 VendorRed Hat Affected — Fixed in 7:5.8.2-9.el10_2 Patch available CNA
- Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in 6:5.8.2-7.el9_8 Patch available CNA
- Red Hat Ansible Automation Platform 2 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Ansible Automation Platform 2 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Ansible Automation Platform 2 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Ansible Automation Platform 2 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Hardened Images VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat OpenShift Container Platform 4 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat OpenShift Container Platform 5 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat OpenShift Dev Spaces VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat OpenShift Dev Spaces VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat OpenShift Dev Spaces VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat OpenShift Virtualization 4 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Quay 3 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Quay 3 VendorRed Hat Affected — Fixed in — Not affected CNA
- github.com/containers/podman/v5 (Go) Vendor— Affected 5.7.0 to before 5.8.6 Fixed in 5.8.6 Patch available GHSA-fx76-2j3w-2mx6
CPE names CNA · 10
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:/o:redhat:enterprise_linux:10.2 | 10.2 | — | Red Hat |
| cpe:/a:redhat:enterprise_linux:9::appstream | 9 | — | Red Hat |
| cpe:/a:redhat:ansible_automation_platform:2 | 2 | — | Red Hat |
| cpe:/a:redhat:enterprise_linux:8 | 8 | — | Red Hat |
| cpe:/a:redhat:hummingbird:1 | 1 | — | Red Hat |
| cpe:/a:redhat:openshift:4 | 4 | — | Red Hat |
| cpe:/a:redhat:openshift:5 | 5 | — | Red Hat |
| cpe:/a:redhat:openshift_devspaces:3 | 3 | — | Red Hat |
| cpe:/a:redhat:container_native_virtualization:4 | 4 | — | Red Hat |
| cpe:/a:redhat:quay:3 | 3 | — | Red Hat |
- cpe:/o:redhat:enterprise_linux:10.2 Versions 10.2 — ·Red Hat
- cpe:/a:redhat:enterprise_linux:9::appstream Versions 9 — ·Red Hat
- cpe:/a:redhat:ansible_automation_platform:2 Versions 2 — ·Red Hat
- cpe:/a:redhat:enterprise_linux:8 Versions 8 — ·Red Hat
- cpe:/a:redhat:hummingbird:1 Versions 1 — ·Red Hat
- cpe:/a:redhat:openshift:4 Versions 4 — ·Red Hat
- cpe:/a:redhat:openshift:5 Versions 5 — ·Red Hat
- cpe:/a:redhat:openshift_devspaces:3 Versions 3 — ·Red Hat
- cpe:/a:redhat:container_native_virtualization:4 Versions 4 — ·Red Hat
- cpe:/a:redhat:quay:3 Versions 3 — ·Red Hat
Remediation
- Fix · GHSA-fx76-2j3w-2mx6 github.com/containers/podman/v5 (Go) Fixed in 5.8.6 Advisory →
Red Hat 2 advisories
- RHSA-2026:69961 Released 2026-09-22 · Red Hat rating Importantpodman security update
- Red Hat Enterprise Linux AppStream (v. 9) podman-6:5.8.2-7.el9_8, podman-docker-6:5.8.2-7.el9_8, podman-plugins-6:5.8.2-7.el9_8 +2
- RHSA-2026:70201 Released 2026-09-22 · Red Hat rating Importantpodman security update
- Red Hat Enterprise Linux AppStream (v. 10) podman-7:5.8.2-9.el10_2, podman-docker-7:5.8.2-9.el10_2, podman-remote-7:5.8.2-9.el10_2
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) podman-tests-7:5.8.2-9.el10_2
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:70201 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:69961 |
| Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) | Fixed | RHSA-2026:70201 |
Not affected: 8 products
- Red Hat Ansible Automation Platform 2
- Red Hat Enterprise Linux 8
- Red Hat Hardened Images
- Red Hat OpenShift Container Platform 4
- Red Hat OpenShift Container Platform 5
- Red Hat OpenShift Dev Spaces
- Red Hat OpenShift Virtualization 4
- Red Hat Quay 3
Timeline
- 2026-10-02 Threatist record created from CVE-2026-19730
- 2026-10-03 Alias added: GHSA-fx76-2j3w-2mx6
- 2026-10-30 Affected versions changed · CNA
- 2026-10-30 Affected versions changed · Red Hat
References
Other 12
- https://access.redhat.com/security/cve/CVE-2026-19730
- RHBZ#2508234
- https://github.com/podman-container-tools/podman/issues/29013
- https://github.com/podman-container-tools/podman/security/advisories/GHSA-fx76-2j3w-2mx6
- https://github.com/podman-container-tools/podman/pull/27980
- https://github.com/podman-container-tools/podman/commit/0ea4eaee70b7458bcc99d875529761faf5172651
- https://github.com/podman-container-tools/podman/commit/a38a9b7d20915c55e6f3c451101ae72d6da33742
- https://github.com/podman-container-tools/podman/commit/d3adfdeec7d5c9eee5a6978df3bee62a866c958d
- https://github.com/podman-container-tools/podman/commit/d4fe9154ec6e32a02d5fcd096c4a27c38f2040f4
- https://github.com/podman-container-tools/podman
- https://github.com/podman-container-tools/podman/releases/tag/v5.8.6
- https://github.com/podman-container-tools/podman/releases/tag/v6.0.0
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Sources
- CVE-2026-19730 · CVE Program
- CVE-2026-19730 · NVD
- FIRST EPSS
- GHSA-fx76-2j3w-2mx6 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-19730 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences