Virtualenvwrapper: virtualenv activate.fish runs commands from a path or prompt with a backslash before a quote
Affects virtualenvwrapperSource GCVE Database
Not known to be exploited · CVSS 7.8 High : upgrade to 6.1.1_3 or 4.8.4_2 soon.
Data as of 30 Oct 2026, 05:16 UTC
Thin evidence
One scorer or none| CNA (GitHub_M) | CVSS 3.1 | 7.8 |
|---|
- Patch
- Available – fixed in 6.1.1_3, 4.8.4_2
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 20 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
Upgrade virtualenvwrapper to 6.1.1_3 or 4.8.4_2.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Homebrewvirtualenvwrapperpkg:brew/virtualenvwrapperOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A patch is available in virtualenvwrapper version 21.14.2 that fixes the quoting issue in activate.fish. Users should upgrade to this version or later. As a workaround, avoid creating virtual environments whose path or prompt contains backslashes, and carefully inspect activate.fish scripts before sourcing them if they were not created by you.
Description
A command injection vulnerability exists in virtualenvwrapper's activate.fish script due to improper quoting of environment path and prompt values. This allows an attacker who can influence the environment path or prompt (e.g., via directory names or CI job names) to execute arbitrary commands when sourcing activate.fish. The issue affects all releases up to 21.14.1 that ship activate.fish and was fixed in version 21.14.2 by properly escaping backslashes and single quotes.
References
- github.com/pypa/virtualenv/security/advisories/GHSA-c947-3pg5-gm8q (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-113732 (opens in a new tab)
- github.com/pypa/virtualenv/commit/3bddeaf8d02c3ee7f576503efb082f8f494cfcab (opens in a new tab)
- github.com/pypa/virtualenv (opens in a new tab)
- github.com/pypa/virtualenv/releases/tag/21.14.2 (opens in a new tab)