Is urllib3 affected by CVE-2026-44431?

PyPI urllib3 is affected in >=1.23 <2.7.0.

Is CVE-2026-44431 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

medium

CVE-2026-44431

Q: Is CVE-2026-44431 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

PyPI · urllib3

Summary

urllib3 is an HTTP client library for Python. From 1.23 to before 2.7.0, cross-origin redirects followed from the low-level API via ProxyManager.connection_from_url().urlopen(..., assert_same_host=False) still forward these sensitive headers. This vulnerability is fixed in 2.7.0.

Severity: medium
EPSS: 0.3% (p17)
Also known as: GHSA-qccp-gfcp-xxvc, PYSEC-2026-141
Published: 2026-05-13

References

https://github.com/urllib3/urllib3/security/advisories/GHSA-qccp-gfcp-xxvc

Related advisories

CVE-2026-44432 — high · PyPI/urllib3
CVE-2026-21441 — high · PyPI/urllib3
CVE-2025-66471 — high · PyPI/urllib3
CVE-2025-66418 — high · PyPI/urllib3
CVE-2025-50182 — medium · PyPI/urllib3
CVE-2025-50181 — medium · PyPI/urllib3

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.