CVE-2026-35342

Summary

mktemp: empty TMPDIR creates temp files in CWD instead of /tmp

Severity

low

CVSS

3.3

EPSS

0.1% (p3)

CWE

CWE-377

Also known as

GHSA-2cxp-xq3c-mjxx, GHSA-2w8r-9xj7-69j5

Published

2026-07-06

Updated

2026-07-06

Advisory details

The mktemp utility in uutils coreutils fails to properly handle an empty TMPDIR environment variable. Unlike GNU mktemp, which falls back to /tmp when TMPDIR is an empty string, the uutils implementation treats the empty string as a valid path. This causes temporary files to be created in the current working directory (CWD) instead of the intended secure temporary directory. If the CWD is more permissive or accessible to other users than /tmp, it may lead to unintended information disclosure or unauthorized access to temporary data.

Zellic finding 3.11. Reported in the Zellic uutils coreutils Program Security Assessment (for Canonical, Jan 2026), audited commit 3a07ffc5a9bd4c283e75afa548ba1f1957bad242.

References

• https://github.com/advisories/GHSA-2w8r-9xj7-69j5
• https://github.com/uutils/coreutils/security/advisories/GHSA-2w8r-9xj7-69j5
• https://nvd.nist.gov/vuln/detail/CVE-2026-35342
• https://github.com/uutils/coreutils/pull/10566
• https://github.com/uutils/coreutils/commit/eb25ec328b226d8fbbaa4058bf9187165bf06d51
• https://github.com/uutils/coreutils/releases/tag/0.6.0

Related advisories

• CVE-2026-55086 — medium · npm/ep_etherpad-lite
• CVE-2026-46406 — medium · npm/@anthropic-ai/claude-code

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