CVE-2026-54552sh _uid does not drop supplementary groups (incomplete privilege drop)
Updated under an hour ago ()
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It affects amoffat sh. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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sh provides Python process launching. Prior to 2.2.4, the _uid option in sh.py performs an incomplete privilege drop on Linux and Unix-like systems. When sh runs from an elevated process and launches a command with _uid set to an unprivileged user, the child changes its UID but can retain the parent process's supplementary groups because the privilege-drop sequence does not fully establish the target user's UID, primary GID, and supplementary groups. The child can therefore retain access to files or resources granted to privileged groups such as root, docker, disk, shadow, or sudo, violating the expected _uid privilege boundary. This issue is fixed in version 2.2.4.
- CVSS
- 7.9 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
- Weakness (CWE)
- CWE-273
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Aug 18, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
amoffat sh amoffat:sh (from the name) | before 2.2.4 | CNA record |
References
- https://github.com/amoffat/sh/security/advisories/GHSA-q38v-wp89-2w55x-refsource-confirm
- https://github.com/amoffat/sh/pull/776x-refsource-misc
- https://github.com/amoffat/sh/commit/3d855daba91f87a089b490c0d1cf1df3faace2f1x-refsource-misc
- https://github.com/amoffat/sh/releases/tag/2.2.4x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.