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Advisory record · GHSA-c947-3pg5-gm8q

virtualenv activate.fish runs commands from a path or prompt with a backslash before a quote

CVSS 7.8 HighEPSS 0.0024 · 14th percentile

Published by the GitHub Advisory Database at 21 Oct 2026, 16:39 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
virtualenvPyPI<21.14.221.14.2
Identifiers
GHSA-c947-3pg5-gm8q · BIT-virtualenv-2026-113732 · CVE-2026-113732
Weakness (CWE)
CWE-78 · CWE-116
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.

Virtualenv versions before 21.14.2 generate an activate.fish script that can run shell commands embedded in the environment path or prompt value, because a backslash before a quote is misread by fish. An attacker needs to control the environment path or prompt, for example through a CI job or a directory in a cloned repository, and the victim must source the generated activate.fish. Upgrade to virtualenv 21.14.2, which escapes these values correctly.

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
7.8 High 3.1 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0024, the 14th 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.