CVE-2026-19730

CVE.org · Published

Record status: Published
Identifier year (not publication year): 2026
Source publication: Aug 13, 2026
Source updated: Oct 1, 2026
Imported by cveboard: Oct 24, 2026
Source snapshot: cve_2026-10-24_midnight_baseline · Oct 24, 2026

CNA source text (English)

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

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).

Scoped product and version facts

Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.

Exploitation unknown; this catalogue does not assess exploitation.

Red Hat Enterprise Linux 10

Vendor: Red Hat
Product: Red Hat Enterprise Linux 10
Platforms: Unknown
Default status: affected
Package: podman
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 10 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
7:5.8.2-9.el10_2	`unaffected`	rpm	*	Unavailable	None listed

Red Hat Enterprise Linux 9

Vendor: Red Hat
Product: Red Hat Enterprise Linux 9
Platforms: Unknown
Default status: affected
Package: podman
Package collection: https://access.redhat.com/downloads/content/package-browser/

Red Hat Enterprise Linux 9 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
6:5.8.2-7.el9_8	`unaffected`	rpm	*	Unavailable	None listed