CVE-2026-9375

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CVE-2026-9375

CVE-2026-9375 is disclosed by multiple advisories tied to python-urllib3. The issue is a decompression-bomb style bypass in urllib3’s streaming API with Brotli support, enabling DoS via oversized decompressed data. Public details confirm affected software (python-urllib3) and the root cause (deco...

Decompression bomb bypass via negative max_length in streaming API (incomplete fix for CVE-2025-66471)

Description The fix for CVE-2025-66471 in urllib3 2.6.0 added maxlength support to all decoders to prevent decompression bombs when using the streaming API. However, three independent code paths in response.py bypass this protection in urllib3 2.6.3 latest. Bypass 1 — Negative maxlength from buff...