GHSA-94p9-xgh2-xp45

Suggest an improvement
Source
https://github.com/advisories/GHSA-94p9-xgh2-xp45
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-94p9-xgh2-xp45/GHSA-94p9-xgh2-xp45.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-94p9-xgh2-xp45
Aliases
Published
2026-09-30T23:54:13Z
Modified
2026-10-01T00:00:04Z
Severity
  • 7.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
virtualenv: Downloaded seed wheels (pip/setuptools) are not integrity-checked before use
Details

download_wheel() runs pip download and hands the result straight to the seeder, with nothing checking the bytes it gets back. The embedded pip and setuptools wheels carry a BUNDLE_SHA256 that virtualenv checks on every load, but a wheel fetched over the network for the periodic-update feature or the --download flag had no equivalent verification.

A compromised index, a stale mirror, or a MITM'd download (when TLS is intercepted, e.g. via a misconfigured or malicious CA) could substitute a different wheel under the same distribution/version/filename, and virtualenv would cache and seed it into every environment created afterward with no warning.

Fixed by computing the downloaded wheel's sha256 and comparing it against the digest PyPI's public JSON API reports for that exact release, independent of which index actually served the file. The check is skipped, not treated as failure, when a custom index (PIP_INDEX_URL, PIP_EXTRA_INDEX_URL, PIP_INDEX) is configured, since a private index can legitimately serve a different, intentionally rebuilt wheel. Fix: https://github.com/pypa/virtualenv/pull/3251

Database specific 
{
    "cwe_ids":  [
        "CWE-494"
    ],
    "github_reviewed":  true,
    "github_reviewed_at":  "2026-09-30T23:54:13Z",
    "nvd_published_at":  "2026-09-29T21:17:18Z",
    "severity":  "HIGH"
}
References

Affected packages

PyPI / virtualenv

Package

Name
virtualenv
View open source insights on deps.dev
Purl
pkg:pypi/virtualenv

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
21.7.12

Affected versions

0.*
0.8
0.8.1
0.8.2
0.8.3
0.8.4
0.9
0.9.1
0.9.2
1.*
1.0
1.1
1.2
1.3
1.3.1
1.3.2
1.3.3
1.3.4
1.4rc1
1.4
1.4.1
1.4.2
1.4.3
1.4.4
1.4.5
1.4.6
1.4.7
1.4.8
1.4.9
1.5
1.5.1
1.5.2
1.6
1.6.1
1.6.2
1.6.3
1.6.4
1.7
1.7.1
1.7.1.1
1.7.1.2
1.7.2
1.8
1.8.1
1.8.2
1.8.3
1.8.4
1.9
1.9.1
1.10
1.10.1
1.11
1.11.1
1.11.2
1.11.3
1.11.4
1.11.5
1.11.6
12.*
12.0
12.0.1
12.0.2
12.0.4
12.0.5
12.0.6
12.0.7
12.1.0
12.1.1
13.*
13.0.0
13.0.1
13.0.2
13.0.3
13.1.0
13.1.1
13.1.2
14.*
14.0.0
14.0.1
14.0.2
14.0.3
14.0.4
14.0.5
14.0.6
15.*
15.0.0
15.0.1
15.0.2
15.0.3
15.1.0
15.2.0
16.*
16.0.0
16.1.0
16.2.0
16.3.0
16.3.1.dev0
16.4.0
16.4.1
16.4.3
16.4.4.dev0
16.5.0
16.6.0
16.6.1
16.6.2
16.7.0
16.7.1
16.7.2
16.7.3
16.7.4
16.7.5
16.7.6
16.7.7
16.7.8
16.7.9
16.7.10
16.7.11
16.7.12
20.*
20.0.0b1
20.0.0b2
20.0.0
20.0.1
20.0.2
20.0.3
20.0.4
20.0.5
20.0.6
20.0.7
20.0.8
20.0.9
20.0.10
20.0.11
20.0.12
20.0.13
20.0.14
20.0.15
20.0.16
20.0.17
20.0.18
20.0.19
20.0.20
20.0.21
20.0.22
20.0.23
20.0.24
20.0.25
20.0.26
20.0.27
20.0.28
20.0.29
20.0.30
20.0.31
20.0.32
20.0.33
20.0.34
20.0.35
20.1.0
20.2.0
20.2.1
20.2.2
20.3.0
20.3.1
20.4.0
20.4.1
20.4.2
20.4.3
20.4.4
20.4.5
20.4.6
20.4.7
20.5.0
20.6.0
20.7.0
20.7.1
20.7.2
20.8.0
20.8.1
20.9.0
20.10.0
20.11.0
20.11.1
20.11.2
20.12.0
20.12.1
20.13.0
20.13.1
20.13.2
20.13.3
20.13.4
20.14.0
20.14.1
20.15.0
20.15.1
20.16.0
20.16.1
20.16.2
20.16.3
20.16.4
20.16.5
20.16.6
20.16.7
20.17.0
20.17.1
20.18.0
20.19.0
20.20.0
20.21.0
20.21.1
20.22.0
20.23.0
20.23.1
20.24.0
20.24.1
20.24.2
20.24.3
20.24.4
20.24.5
20.24.6
20.24.7
20.25.0
20.25.1
20.25.2
20.25.3
20.26.0
20.26.1
20.26.2
20.26.3
20.26.4
20.26.5
20.26.6
20.27.0
20.27.1
20.28.0
20.28.1
20.29.0
20.29.1
20.29.2
20.29.3
20.30.0
20.31.0
20.31.1
20.31.2
20.32.0
20.33.0
20.33.1
20.34.0
20.35.0
20.35.1
20.35.2
20.35.3
20.35.4
20.36.0
20.36.1
20.38.0
20.39.0
20.39.1
21.*
21.0.0
21.1.0
21.2.0
21.2.1
21.2.2
21.2.3
21.2.4
21.3.0
21.3.1
21.3.2
21.3.3
21.4.0
21.4.1
21.4.2
21.4.3
21.5.0
21.5.1
21.5.2
21.6.0
21.6.1
21.7.0
21.7.1
21.7.2
21.7.3
21.7.4
21.7.5
21.7.6
21.7.7
21.7.8
21.7.9
21.7.10
21.7.11

Database specific

last_known_affected_version_range 
"<= 21.7.11"
source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-94p9-xgh2-xp45/GHSA-94p9-xgh2-xp45.json"