CVE-2026-35342

The record

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.

Affected packages

Related vulnerabilities

• GHSA-2cxp-xq3c-mjxx uutils coreutils' mktemp utility doesn't properly handle an empty TMPDIR environment… Same vulnerability
• GHSA-532v-xp3f-837c uutils coreutils has an Incorrect Provision of Specified Functionality Issue in its cut… Also affects coreutils
• GHSA-6g8r-74qp-6859 uutils coreutils has a Time-of-check Time-of-use (TOCTOU) Race Condition Also affects coreutils
• GHSA-53gr-wmf4-8hh3 uutils coreutils's User Interface (UI) Misrepresents Critical Information Also affects coreutils
• GHSA-5pv5-xh52-hvrp uutils coreutils has an Incorrect Short Circuit Evaluation Issue Also affects coreutils
• GHSA-5v4g-vw9x-h534 uutils coreutils has an Improper Input Validation Issue in its env Utility Also affects coreutils
• GHSA-4wrp-79m8-9m9p uutils coreutils has a Time-of-check Time-of-use (TOCTOU) Race Condition Also affects coreutils
• GHSA-fhr3-xh3q-69w6 uutils coreutils has an Incorrect Provision of Specified Functionality Issue Also affects coreutils