BREW-VIRTUALENV-CVE-2026… (CVE-2026-102925)
Vulnerability from osv_homebrew – Published: 2026-10-05 04:49 – Updated: 2026-10-29 23:06 – Source websitevirtualenv is a tool for creating isolated virtual python environments. Prior to 21.7.13, the generated activate (bash and zsh) and activate.fish scripts place values already escaped by shlex.quote inside an additional quoted context. In the bash and zsh script, a crafted virtual environment path reaches VIRTUAL_ENV when a relocated environment's recorded directory is absent; in the fish script, crafted Tcl or Tk library paths reach TCL_LIBRARY or TK_LIBRARY. The surplus quotes can terminate the data-only quoted run and leave shell metacharacters parsed as commands when a user sources the activation script, allowing code execution with that user's privileges. This issue is fixed in version 21.7.13.
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"upstream_fixed_in": "21.7.13"
},
"package": {
"ecosystem": "Homebrew",
"name": "virtualenv",
"purl": "pkg:brew/virtualenv"
},
"ranges": [
{
"events": [
{
"introduced": "20.33.0"
},
{
"fixed": "21.7.14"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "git",
"upstream_evidence": [
{
"ecosystem": "GIT",
"key": "https://github.com/pypa/virtualenv",
"name": "https://github.com/pypa/virtualenv",
"strategy": "git",
"subject_version": "21.15.1"
},
{
"ecosystem": "PyPI",
"key": "pkg:pypi/virtualenv@21.15.1",
"name": "virtualenv",
"strategy": "registry",
"subject_version": "21.15.1"
},
{
"ecosystem": "Debian",
"key": "Debian/python-virtualenv",
"name": "python-virtualenv",
"strategy": "distro"
},
{
"ecosystem": "GIT",
"key": "upstream:https://github.com/pypa/virtualenv",
"name": "https://github.com/pypa/virtualenv",
"strategy": "distro",
"subject_version": "21.15.1"
},
{
"ecosystem": "PyPI",
"key": "upstream:pkg:pypi/virtualenv@21.15.1",
"name": "virtualenv",
"strategy": "distro",
"subject_version": "21.15.1"
},
{
"ecosystem": "Ubuntu",
"key": "Ubuntu/python-virtualenv",
"name": "python-virtualenv",
"strategy": "distro"
}
]
},
"details": "virtualenv is a tool for creating isolated virtual python environments. Prior to 21.7.13, the generated activate (bash and zsh) and activate.fish scripts place values already escaped by shlex.quote inside an additional quoted context. In the bash and zsh script, a crafted virtual environment path reaches __VIRTUAL_ENV__ when a relocated environment\u0027s recorded directory is absent; in the fish script, crafted Tcl or Tk library paths reach __TCL_LIBRARY__ or __TK_LIBRARY__. The surplus quotes can terminate the data-only quoted run and leave shell metacharacters parsed as commands when a user sources the activation script, allowing code execution with that user\u0027s privileges. This issue is fixed in version 21.7.13.",
"id": "BREW-virtualenv-CVE-2026-102925",
"modified": "2026-10-29T23:06:10Z",
"published": "2026-10-05T04:49:24Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pypa/virtualenv/releases/tag/21.7.13"
},
{
"type": "ADVISORY",
"url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102925.json"
},
{
"type": "ADVISORY",
"url": "https://github.com/pypa/virtualenv/security/advisories/GHSA-p58f-9548-mpm2"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-102925"
},
{
"type": "FIX",
"url": "https://github.com/pypa/virtualenv/commit/4d5a105ec2a2723b8c7f4571bb68f4f71d01e3f6"
},
{
"type": "FIX",
"url": "https://github.com/pypa/virtualenv/pull/3252"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
],
"summary": "virtualenv bash and fish activation scripts execute commands embedded in paths",
"upstream": [
"CVE-2026-102925",
"GHSA-p58f-9548-mpm2",
"PYSEC-2026-4013",
"BIT-virtualenv-2026-102925"
]
}
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
Loading timeline…
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.