CVE-2026-19730 (GCVE-0-2026-19730)

Vulnerability from cvelistv5 – Published: 2026-08-13 17:53 – Updated: 2026-11-05 19:26
VLAI
Title
Podman: podman: quadlet install --replace non-truncating write retains removed host-access directives
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).
Severity
4.2 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-13 18:37 UTC
CWE
Assigner
redhat CNA under the redhat root
CNA scorecard B 82/100 over 1197 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Red Hat Red Hat Enterprise Linux 10 Unaffected: 7:5.8.2-9.el10_2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 6:5.8.2-7.el9_8 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9::appstream
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Red Hat Red Hat Ansible Automation Platform 2     cpe:/a:redhat:ansible_automation_platform:2
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Red Hat Red Hat Enterprise Linux 8     cpe:/a:redhat:enterprise_linux:8
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Red Hat Red Hat Hardened Images     cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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Red Hat Red Hat OpenShift Container Platform 5     cpe:/a:redhat:openshift:5
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Red Hat Red Hat OpenShift Dev Spaces     cpe:/a:redhat:openshift_devspaces:3
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Red Hat Red Hat OpenShift Virtualization 4     cpe:/a:redhat:container_native_virtualization:4
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Red Hat Red Hat Quay 3     cpe:/a:redhat:quay:3
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Date Public
2026-08-10 00:00
Credits
Red Hat would like to thank Christopher Lusk (North Echo Security Research) and Paul Holzinger (Podman) for reporting this issue.
Show details on NVD website
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}



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