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Vulnerabilities

Security fix · CVE-2026-113717

virtualenv is a tool for creating isolated virtual python environments.

Published Oct 20, 2026 · catalog updated Oct 23, 2026 · virtualenv is a tool

Last checked Nov 3, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-113717. EPSS is 0.29%. Act only if a listed version of virtualenv is a tool is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (virtualenv is a tool).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Low2.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.29%
Remediation
Version ranges on file
Affected products
PyPI virtualenv · pip virtualenv · pypi virtualenv

## Summary The pip seeder acquires bundled wheels with download=False and lets pip access the index when --download is selected. Index candidates on that path do not pass through virtualenv's wheel digest verification. Anthropic's OSS Scanner reported this as in , received on 15 October 2026. ## Affected area Wheel selection by the pip seeder when downloads are enabled. ## Attacker-controlled input The pip seeder and download option must be selected. The finding concerns the default-index digest-verification policy. Explicit custom-index settings already opt out of comparison against PyPI metadata; this patch retains that policy. ## Affected code The relevant 21.14.8 source is in [pip seeder](https://github.com/pypa/virtualenv/blob/a795ab116356afde11039cf2763d77e8a06da738/src/virtualenv/seed/embed/pip_invoke.py). ## Mechanism With , first calls , so virtualenv's and are skipped. It then lets consult the configured index. An index wheel with the same package and version as the bundled wheel can be selected without virtualenv comparing its SHA-256 with PyPI metadata. The default app-data seeder takes the verification path for the same option. ## Reproduction and evidence The scanner built a local index named in that served a modified copy of the bundled pip wheel under the same filename. In the control run, rejected the wheel with a digest mismatch. In the second run, adding produced an environment whose installed matched the index wheel; ran the added line. The reproducer checked the installed bytes and marker before reporting . Both and are needed. The report used a non-PyPI index from and left , , and unset, so virtualenv's default-seeder PyPI comparison remained active. This does not establish index control in the default PyPI setup. The unchecked pip-seeder download path is older, while the comparison with the default seeder arose when digest verification was added in 21.7.12. [PR #3430](https://github.com/pypa/virtualenv/pull/3430) acquires and verifies selected

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • PyPI virtualenv0 → 21.14.9
  • pip virtualenv< 21.14.9
  • pypi virtualenv<21.14.9

How to fix CVE-2026-113717

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-113717. EPSS is 0.29%. Act only if a listed version of virtualenv is a tool is installed.

Which versions are affected?

Compare what you have installed with 0 → 21.14.9, < 21.14.9, <21.14.9. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-494. EPSS 0.29%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 20, 2026 · NIST NVD

    Detected

    virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.9, PipInvoke.get_pip_install_cmd() handles --seeder pip --download by calling get_wheel(download=False) and then allowing pip to consult the configured index, bypassing virtualenv's download_wheel() and verify_wheel_digest() path. When virtualenv's default-index PyPI digest comparison remains enabled, an index c

  2. Oct 22, 2026 · NIST NVD

    Updated

    virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.9, PipInvoke.get_pip_install_cmd() handles --seeder pip --download by calling get_wheel(download=False) and then allowing pip to consult the configured index, bypassing virtualenv's download_wheel() and verify_wheel_digest() path. When virtualenv's default-index PyPI digest comparison remains enabled, an index c

  3. Oct 23, 2026 · GitHub Advisory Database

    Updated

    ## Summary The pip seeder acquires bundled wheels with download=False and lets pip access the index when --download is selected. Index candidates on that path do not pass through virtualenv's wheel digest verification. Anthropic's OSS Scanner reported this as in , received on 15 October 2026. ## Affected area Wheel selection by the pip seeder when downloads are enabled. ## Attacker-controlled inpu

  4. Oct 23, 2026 · PyPA Advisory Database

    Fix available

    virtualenv fixed in 21.14.9

  5. Oct 23, 2026 · PyPA Advisory Database

    Fix available

    virtualenv fixed in 21.14.9

  6. Oct 23, 2026 · PyPA Advisory Database

    Updated

    ## Summary The pip seeder acquires bundled wheels with download=False and lets pip access the index when --download is selected. Index candidates on that path do not pass through virtualenv's wheel digest verification. Anthropic's OSS Scanner reported this as in , received on 15 October 2026. ## Affected area Wheel selection by the pip seeder when downloads are enabled. ## Attacker-controlled inpu

Sources

  • CVE.orgVulnerability recordCVE-2026-113717

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-113717

    30-day exploitation probability 0.29%

    first.org
  • GitHub Advisory DatabasePackage advisoryGHSA-cx28-75q4-x26q

    virtualenv: Pip seeding with download omits wheel digest verification

    github.com
  • GitLab Advisory DatabasePackage advisoryCVE-2026-113717

    The pip seeder acquires bundled wheels with download=False and lets pip access the index when &ndash;download is selected. Index candidates on that path do not pass through virtualenv's wheel digest verification. Anthropic's OSS Scanner reported this as ANT-2026-74ALJBUF in virtualenv-20261015-005, received on 15 October 2026.

    advisories.gitlab.com
  • GitLab Advisory DatabasePackage advisorypypi/virtualenv/CVE-2026-113717.yml

    The pip seeder acquires bundled wheels with download=False and lets + pip access the index when --download is selected.\nIndex candidates on that path + do not pass through virtualenv's wheel digest verification.\n\nAnthropic's OSS Scanner + reported this as in , received on 15 + October 2026." +date: "2026-10-23" +pubdate: "2026-10-23" +affected_range: "<21.14.9" +fixed_versions: +- "21.14.9" +af

    gitlab.com
  • NIST NVDVulnerability recordCVE-2026-113717

    virtualenv is a tool for creating isolated virtual python environments. Prior to 21.14.9, PipInvoke.get_pip_install_cmd() handles --seeder pip --download by calling get_wheel(download=False) and then allowing pip to consult the configured index, bypassing virtualenv's download_wh

    nvd.nist.gov
  • PyPA Advisory DatabasePackage advisoryGHSA-cx28-75q4-x26q

    virtualenv: Pip seeding with download omits wheel digest verification

    osv.dev

References

Freshness

Last verified in this catalog Nov 3, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 3, 2026
  • GitLab Advisory DatabaseOct 27, 2026
  • PyPA Advisory DatabaseOct 25, 2026
  • GitLab Advisory DatabaseOct 25, 2026
  • GitHub Advisory DatabaseOct 24, 2026
  • CVE.orgOct 23, 2026
  • NIST NVDOct 22, 2026