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🛡️ CVE-2026-54552 — sh

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-273 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

sh _uid does not drop supplementary groups (incomplete privilege drop)

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs administrative privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity high, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: High — administrative rights are needed first.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Changed — a successful attack reaches components beyond the vulnerable one.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: None.

Weakness class

CVE-2026-54552 is classified as CWE-273: Improper Check for Dropped Privileges. The product attempts to drop privileges but does not check or incorrectly checks to see if the drop succeeded.

Affected software

CVE-2026-54552 is recorded against 2 packages.

  • sh (fixed in 2.2.4)
  • unknown

Timeline and source

Published on 23 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
github.com (Package)
github.com (Web)
pypi.org (Package)
github.com (Advisory)
nvd.nist.gov (Advisory)

Same weakness in other software

These advisories are the same class of weakness (CWE-273: Improper Check for Dropped Privileges) in other software:

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
CWE CWE-273
Public Exploit ✅ No
Source NVD
Published 2026-07-23
Updated 2026-08-20
Modified 2026-07-23
Fix URL N/A

Affected Packages

Software From version Fixed in
sh — 2.2.4
unknown — —

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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