id: PYSEC-2026-2409
published: "2026-07-13T15:15:38.486819Z"
modified: "2026-07-13T16:03:42.071771Z"
aliases:
- CVE-2026-44218
- GHSA-jrm4-4pcf-4763
summary: "ciguard: Container image runs as root (no USER directive)"
details: "## Summary\n\nThe published `ghcr.io/jo-jo98/ciguard` container image inherits the default root user because the `Dockerfile` lacks a `USER` directive. ciguard is a static analyser with no need for root privileges; running as root inside a container makes any future container-runtime escape CVE more impactful than it needs to be.\n\n## Threat scenario\n\nDefence-in-depth gap. Without a known container-runtime CVE in the chain, this finding is not directly exploitable. Recent runc CVEs (e.g. CVE-2024-21626) provided escape primitives that depended on host UID = container UID = 0 for full impact; with this fix, any future such escape primitive lands as a non-root user on the host.\n\n## Patch\n\n- Dockerfile adds `RUN groupadd -r ciguard && useradd -r -g ciguard -d /home/ciguard -m -s /usr/sbin/nologin ciguard && chown -R ciguard:ciguard /reports /policies-mount /app`.\n- Followed by `USER ciguard` before the `CMD` directive.\n- Trivy DS-0002 misconfig clears (`Tests: 20 SUCCESSES: 20 FAILURES: 0`).\n\n## Discovery\n\nFound by Trivy filesystem scan during ciguard's first self-conducted pentest cycle, 2026-04-26.\n\n## CVSS Scoring\n\n- CVSS v3.1: `CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N` — 2.0 (Low)\n- CVSS v4.0: `CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N` — 3.4 (Low) per Cycle 1 report; GitHub's calc 1.8 (Low). Both Low.\n\n## Verification\n\n```\n$ docker run --rm ghcr.io/jo-jo98/ciguard:v0.8.2 id\nuid=999(ciguard) gid=999(ciguard) groups=999(ciguard)\n```\n\n## References\n\n- Fix released in [v0.8.2](https://github.com/Jo-Jo98/ciguard/releases/tag/v0.8.2)\n- CI regression gate added in [v0.8.3](https://github.com/Jo-Jo98/ciguard/releases/tag/v0.8.3)\n- https://www.cve.org/CVERecord?id=CVE-2026-44218"
affected:
- package:
    name: ciguard
    ecosystem: PyPI
    purl: pkg:pypi/ciguard
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: 0.1.0
    - fixed: 0.8.2
  versions:
  - 0.1.0
  - 0.1.1
  - 0.1.2
  - 0.1.3
  - 0.1.4
  - 0.2.0
  - 0.2.1
  - 0.3.0
  - 0.4.0
  - 0.4.1
  - 0.5.0
  - 0.6.0
  - 0.6.1
  - 0.7.0
  - 0.8.1
references:
- type: WEB
  url: https://github.com/Jo-Jo98/ciguard/security/advisories/GHSA-jrm4-4pcf-4763
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2026-44218
- type: PACKAGE
  url: https://github.com/Jo-Jo98/ciguard
- type: WEB
  url: https://github.com/Jo-Jo98/ciguard/releases/tag/v0.8.2
- type: WEB
  url: https://github.com/Jo-Jo98/ciguard/releases/tag/v0.8.3
- type: PACKAGE
  url: https://pypi.org/project/ciguard
- type: ADVISORY
  url: https://github.com/advisories/GHSA-jrm4-4pcf-4763
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:N
- type: CVSS_V4
  score: CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N