PyPI/urllib3 CVE-2025-66471: high 7.5, EPSS 0.68%

urllib3 streaming API improperly handles highly compressed data

Action: Upgrade urllib3 to 2.6.0 or later.

pip install urllib3==2.6.0

Affected

Fixed versions

Sources

• osv: PYSEC-2026-1994
• nvd: CVE-2025-66471
• https://github.com/urllib3/urllib3/security/advisories/GHSA-2xpw-w6gg-jr37
• https://github.com/urllib3/urllib3/commit/c19571de34c47de3a766541b041637ba5f716ed7
• https://github.com/urllib3/urllib3
• https://pypi.org/project/urllib3
• https://github.com/advisories/GHSA-2xpw-w6gg-jr37

CVE-2025-66471 · published 2026-07-07T16:03:12.332335Z · modified 2026-07-07T17:48:15.379954669Z · JSON