PYSEC-2026-142
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/urllib3/PYSEC-2026-142.yaml
- JSON Data
- https://api.test.osv.dev/v1/vulns/PYSEC-2026-142
- Aliases
- Published
- 2026-05-13T16:16:57.303Z
- Modified
- 2026-05-20T09:19:21.038869Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
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.
- References
Affected packages
PyPI / urllib3
Package
- Name
- urllib3
- View open source insights on deps.dev
- Purl
- pkg:pypi/urllib3