Is urllib3 affected by CVE-2026-44432?

PyPI urllib3 is affected in >=2.6.0 <2.7.0.

Is CVE-2026-44432 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

high

CVE-2026-44432

Q: Is CVE-2026-44432 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

PyPI · urllib3

Summary

urllib3 is an HTTP client library for Python. From 2.6.0 to before 2.7.0, urllib3 could decompress the whole response instead of the requested portion (1) during the second HTTPResponse.read(amt=N) call when the response was decompressed using the official Brotli library or (2) when HTTPResponse.dra

Severity: high
EPSS: 0.4% (p28)
Also known as: GHSA-mf9v-mfxr-j63j, PYSEC-2026-142
Published: 2026-05-13

References

https://github.com/urllib3/urllib3/security/advisories/GHSA-mf9v-mfxr-j63j

Related advisories

CVE-2026-21441 — high · PyPI/urllib3
CVE-2025-66471 — high · PyPI/urllib3
CVE-2025-66418 — high · PyPI/urllib3
CVE-2026-44431 — medium · 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.