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Low severity3.3NVD Advisory· Published Jul 1, 2026· Updated Jul 2, 2026

CVE-2026-41579

CVE-2026-41579

Description

runc is a CLI tool for spawning and running containers according to the OCI specification. In versions prior to 1.3.6, 1.4.0-rc.1, 1.4.0-rc.12, 1.5.0-rc.1, and 1.5.0-rc.1, when setting up the container rootfs, setupPtmx and setupDevSymlinks call os.Remove and os.Symlink with a filepath.Join string which allow an image with /dev as a symlink to trick runc into deleting files called ptmx on the host or creating a hardcoded set of symlinks with specific names and targets in an arbitrary pre-existing host directory. This issue is not exploitable under Docker, because Docker creates a top-level read-only layer that masks any malicious /dev symlink present in the container image — unlike some other Linux container tooling, whose higher-level runtimes built on runc remain exposed to exploitation via a malicious image. This issue has been fixed in versions 1.3.6, 1.4.3 and 1.5.0.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
github.com/opencontainers/runcGo
< 1.3.61.3.6
github.com/opencontainers/runcGo
>= 1.4.0, < 1.4.31.4.3
github.com/opencontainers/runcGo
>= 1.5.0-rc.1, < 1.5.0-rc.31.5.0-rc.3

Affected products

90

Patches

Vulnerability mechanics

References

3

News mentions

0

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