# CVE-2026-41579

## Summary

- **CVE ID:** CVE-2026-41579
- **Severity:** LOW
- **CVSS Score:** 3.3 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N)
- **CWE:** CWE-61
- **Published:** Jul 1, 2026
- **Last Modified:** Jul 1, 2026

## 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 Products

- opencontainers — runc (< 1.3.6)
- opencontainers — runc (>= 1.4.0-rc.1, < 1.4.3)
- opencontainers — runc (>= 1.5.0-rc.1, < 1.5.0-rc.3)

## References

- [CNA](https://github.com/opencontainers/runc/security/advisories/GHSA-xjvp-4fhw-gc47)
- [CNA](https://github.com/opencontainers/runc/commit/864db8042dbb)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.19%
- **EPSS Percentile:** 8.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._