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.
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Fri, 22 May 2026 00:15:00 +0000
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threat_severity
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Fri, 15 May 2026 19:15:00 +0000
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ssvc
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Thu, 14 May 2026 14:00:00 +0000
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Python
Python urllib3 |
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| CPEs | cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:* | |
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Python urllib3 |
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cvssV3_1
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Wed, 13 May 2026 19:00:00 +0000
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Urllib3 urllib3 |
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Urllib3
Urllib3 urllib3 |
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| 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. | |
| Title | urllib3: Decompression-bomb safeguards bypassed in parts of the streaming API | |
| Weaknesses | CWE-409 | |
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cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-05-13T15:17:12.611Z
Updated: 2026-05-15T18:25:06.331Z
Reserved: 2026-05-06T14:40:00.954Z
Link: CVE-2026-44432
Updated: 2026-05-15T18:25:01.877Z
Status : Analyzed
Published: 2026-05-13T16:16:57.303
Modified: 2026-05-14T13:49:25.483
Link: CVE-2026-44432
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