PT-2026-64140 · Pypi · Sh

Published 2026-07-23 · Updated 2026-07-23

OSV

CVSS v3.1

7.9

High

Base vector

AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

Impact

The uid option performed an incomplete privilege drop on Linux/Unix-like systems.

When sh was run from a process with elevated privileges, such as root, and a command was launched with uid=<unprivileged user>, the child process changed its UID and primary GID but did not reset its supplementary groups. As a result, the child process could retain the parent process’s supplementary groups, potentially including privileged groups such as root, docker, disk, shadow, or sudo.

This could allow a subprocess that was expected to run with reduced privileges to access files or resources available to the original process’s supplementary groups. Users are impacted if they rely on uid as a privilege boundary when launching commands from a privileged parent process.

Patches

Upgrade to version >= 2.2.4

Workarounds

Avoid using uid when the user represents a less-privileged user.

Fix

Related Identifiers

PYSEC-2026-3540

Affected Products

Sh

References · 7

• https://osv.dev/vulnerability/PYSEC-2026-3540 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-54552 · Security Note
• https://github.com/amoffat/sh/releases/tag/2.2.4 · Note
• https://github.com/amoffat/sh · Note
• https://github.com/amoffat/sh/security/advisories/GHSA-q38v-wp89-2w55 · Note
• https://github.com/advisories/GHSA-q38v-wp89-2w55 · Note
• https://pypi.org/project/sh · Note