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CVE PROGRAM SOURCE RECORD8.9 High

CVE-2026-44432

urllib3: Decompression-bomb safeguards bypassed in parts of the streaming API

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Status
Published
Published
Updated
Assigning organization
GitHub_M

Description

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.drain_conn() was called after the response had been read and decompressed partially (compression algorithm did not matter here). These issues could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This could result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data) on the client side. This vulnerability is fixed in 2.7.0.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

urllib3 urllib3

  • >= 2.6.0, < 2.7.0affected

References