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.
Severity (CVSS)
| Base score | 3.3 |
|---|---|
| Severity | Low |
| Version | CVSS 3.1 |
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N |
| Provided by | CNA |
Weaknesses
- CWE-61 — CWE-61: UNIX Symbolic Link (Symlink) Following
Affected products
| Vendor | Product | Versions |
|---|---|---|
| opencontainers | runc | < 1.3.6; >= 1.4.0-rc.1, < 1.4.3; >= 1.5.0-rc.1, < 1.5.0-rc.3 |
References
- https://github.com/opencontainers/runc/security/advisories/GHSA-xjvp-4fhw-gc47 (x_refsource_CONFIRM)
- https://github.com/opencontainers/runc/commit/864db8042dbb (x_refsource_MISC)
Generated from the official CVE List on 01 Jul 2026 07:05 UTC.