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CVE-2026-102930— virtualenv: Downloaded seed wheels (pip/setuptools) are not integrity-checked before use

Quick assessment

Affected
pypa virtualenv
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

virtualenv is a tool for creating isolated virtual python environments. Prior to 21.7.12, download_wheel() accepts pip and setuptools seed wheels fetched for periodic updates or the --download option without checking their bytes against an authoritative digest

CVSS 7.7 · High
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I. Basic Information for CVE-2026-102930

Vulnerability Information

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Vulnerability Title
virtualenv: Downloaded seed wheels (pip/setuptools) are not integrity-checked before use
Source: CVE Program / CVE List V5
Vulnerability Description
virtualenv is a tool for creating isolated virtual python environments. Prior to 21.7.12, download_wheel() accepts pip and setuptools seed wheels fetched for periodic updates or the --download option without checking their bytes against an authoritative digest equivalent to the embedded wheels' BUNDLE_SHA256 verification. A compromised index, stale mirror, or intercepted TLS connection can substitute a different wheel under the requested distribution, version, and filename, after which virtualenv caches and seeds the attacker-controlled wheel into subsequently created environments. The verification applies to the default PyPI path and is intentionally skipped when PIP_INDEX_URL, PIP_EXTRA_INDEX_URL, or PIP_INDEX configures a custom index that may legitimately publish rebuilt wheels. This issue is fixed in version 21.7.12.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
下载代码缺少完整性检查
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
pypa virtualenv < 21.7.12 -

II. Public POCs for CVE-2026-102930

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III. Intelligence Information for CVE-2026-102930

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Other References for CVE-2026-102930 (3)

Same Patch Batch · pypa · 2026-09-29 · 4 CVEs total

CVE-2026-102925 7.8 HIGH virtualenv bash and fish activation scripts execute commands embedded in paths
CVE-2026-102937 7.3 HIGH virtualenv: Command injection via --prompt in activate.bat (batch activator)
CVE-2026-102938 5.8 MEDIUM virtualenv writes prompt values into pyvenv.cfg without sanitizing line boundaries, allowi

IV. Related Vulnerabilities

Same product: virtualenv
Same vendor: pypa
Same weakness: CWE-494

V. Comments for CVE-2026-102930

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