CVE-2026-35366

Summary

printenv: environment variables with invalid UTF-8 are silently skipped (evades inspection)

Severity

medium

CVSS

4.4

EPSS

0.2% (p7)

CWE

CWE-116, CWE-754

Also known as

GHSA-7259-cwhx-3xx3, GHSA-p7h3-7q52-72w8

Published

2026-07-06

Updated

2026-07-06

Advisory details

The printenv utility in uutils coreutils fails to display environment variables containing invalid UTF-8 byte sequences. While POSIX permits arbitrary bytes in environment strings, the uutils implementation silently skips these entries rather than printing the raw bytes. This vulnerability allows malicious environment variables (e.g., adversarial LD_PRELOAD values) to evade inspection by administrators or security auditing tools, potentially allowing library injection or other environment-based attacks to go undetected.

Zellic finding 3.66. Reported in the Zellic uutils coreutils Program Security Assessment (for Canonical, Jan 2026), audited commit 3a07ffc5a9bd4c283e75afa548ba1f1957bad242.

References

• https://github.com/advisories/GHSA-p7h3-7q52-72w8
• https://github.com/uutils/coreutils/security/advisories/GHSA-p7h3-7q52-72w8
• https://nvd.nist.gov/vuln/detail/CVE-2026-35366
• https://github.com/uutils/coreutils/issues/9701
• https://github.com/uutils/coreutils/pull/9728
• https://github.com/uutils/coreutils/commit/0bfbbc00c7895c0fb6ea94987b4aab99e3d7ee52
• https://github.com/uutils/coreutils/releases/tag/0.6.0

Related advisories

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• CVE-2026-62681 — critical · npm/orval
• CVE-2026-62682 — critical · npm/orval
• CVE-2026-72717 — critical · npm/orval
• CVE-2026-71869 — critical · npm/orval
• CVE-2026-71871 — critical · npm/orval
• CVE-2026-71865 — critical · npm/orval
• CVE-2026-71864 — critical · npm/orval

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