Vulnerability in Uutils Coreutils
CVE-2026-35342
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.002 (3.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 3.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.000
Affected products
- Uutils Coreutils — versions 0
Weakness classification (CWE)
References
- github.com/uutils/coreutils/pull/10566 (issue-tracking, Patch, patch, Issue Tracking)
- github.com/uutils/coreutils/releases/tag/0.6.0 (vendor-advisory, Release Notes)
Frequently asked questions
- What is CVE-2026-35342?
- CVE-2026-35342 is a low-severity vulnerability in Uutils Coreutils, classified under Insecure Temporary File. CVSS score: 3.3/10. Published 2026-04-22.
- How severe is CVE-2026-35342?
- Low severity. CVSS v3 base score is 3.3 out of 10.