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Back to active CVEs
Low · CVSS 2.0CVE-2026-41991

Predictable Temporary File in GNU gzipCVE-2026-41991

Answer in brief

CVE-2026-41991 records a Low severity (CVSS 2.0) vulnerability in Predictable Temporary File in GNU gzip. The current sources do not mark it as known exploited. The current feed maps GNU/gzip (generic), GNU/gzip (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jun 29, 2026Updated Oct 25, 2026Source checked Nov 4, 2026First seen by HOL Jun 29, 2026Material review Oct 25, 2026
Upstream Advisory

Key facts

Risk
Low · CVSS 2.0
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 2.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps GNU/gzip (generic), GNU/gzip (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:gnu:gzip:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
GNU/gzipgeneric>=0 <=1.14Not reported
GNU/gzipgeneric0Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for GNU/gzip, GNU/gzip.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Jun 29, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 25, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Jun 29, 2026

Sources and claim methodology

  • Source referencecert.pl
  • Source referencecgit.git.savannah.gnu.org
  • Source referencegnu.org
Upstream source description

GNU gzip contains a vulnerability in the gzexe utility related to insecure temporary file handling. When the mktemp utility is not available in the user’s PATH, gzexe falls back to constructing a temporary file path based solely on the process ID (PID). This predictable filename is created without exclusive access or existence checks. A local attacker can pre‑create the predicted temporary file path as a symbolic link pointing to an arbitrary file writable by the victim. When gzexe runs, it follows the symlink and overwrites the target file, resulting in a time‑of‑check to time‑of‑use (TOCTOU) condition that allows arbitrary file overwrite. This issue has been fixed in the commit 4e6f8b24ab823146ab8776f0b7fe486ab34d4269

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-377
Source
CVE List V5
Source checked
Nov 4, 2026
References
3 linked sources
Open source record