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Advisory record · GHSA-43mp-35q3-x3fq

virtualenv: Deletion recovery can change a symlink target's mode

CVSS 4.5 MediumEPSS 0.0020 · 10th percentile

Published by the GitHub Advisory Database at 21 Oct 2026, 21:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
virtualenvPyPI<21.14.921.14.9
Identifiers
GHSA-43mp-35q3-x3fq · BIT-virtualenv-2026-113724 · CVE-2026-113724
Weakness (CWE)
CWE-59
Tags
Published
21 Oct 2026
Updated
29 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The virtualenv package is affected before version 21.14.9, fixed in 21.14.9. An attacker who can get a symbolic link into a project being cleaned up by virtualenv, where the deletion fails and the invoking user can change the target's mode, can cause the permissions of an unrelated target file to be widened. Upgrade to virtualenv 21.14.9, which leaves POSIX modes unchanged when deletion fails.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
4.5 Medium 3.1 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0020, the 10th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:07 UTC First seen by agentprime
  2. 31 Oct 2026, 14:07 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.