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CVE-2026-21860

Werkzeug is a comprehensive WSGI web application library. Prior to version 3.1.5, Werkzeug's safe_join function allows path segments with Windows device names that have file extensions or trailing spaces. On Windows, there are special device names such as CON, AUX, etc that are implicitly present and readable in every directory. Windows still accepts them with any file extension, such as CON.txt, or trailing spaces such as CON. This issue has been patched in version 3.1.5.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:528985b8e10726d29770e324e3629a09763db59af462f78c9db1da1a7f7e7b54
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"werkzeug","vendor":"pallets","versions":[{"status":"affected","version":"< 3.1.5"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9da99cef3edf739da387d5a4dfd72a4339977ed5e5148f7cf899b052eedbf0a5 · sha256:2800df968fb60c91… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":6.3,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9da99cef3edf739da387d5a4dfd72a4339977ed5e5148f7cf899b052eedbf0a5 · sha256:2800df968fb60c91… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-67","description":"CWE-67: Improper Handling of Windows Device Names","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9da99cef3edf739da387d5a4dfd72a4339977ed5e5148f7cf899b052eedbf0a5 · sha256:2800df968fb60c91… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/pallets/werkzeug/commit/7ae1d254e04a0c33e241ac1cca4783ce6c875ca3","tags":["x_refsource_MISC"],"url":"https://github.com/pallets/werkzeug/commit/7ae1d254e04a0c33e241ac1cca4783ce6c875ca3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9da99cef3edf739da387d5a4dfd72a4339977ed5e5148f7cf899b052eedbf0a5 · sha256:2800df968fb60c91… · /containers/cna/references/1
{"name":"https://github.com/pallets/werkzeug/security/advisories/GHSA-87hc-h4r5-73f7","tags":["x_refsource_CONFIRM"],"url":"https://github.com/pallets/werkzeug/security/advisories/GHSA-87hc-h4r5-73f7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9da99cef3edf739da387d5a4dfd72a4339977ed5e5148f7cf899b052eedbf0a5 · sha256:2800df968fb60c91… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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