PYSEC-2026-4177 urllib3: HTTPResponse.stream()/read_chunked() buffers an unbounded chunk-size line into memory

Impact urllib3's streaming API is designed for efficiently handling large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once. When decoding a chunked-transfer-encoded response, this API reads each chunk's size field by buffering until...

urllib3: HTTPResponse.stream()/read_chunked() buffers an unbounded chunk-size line into memory

Impacturllib3's streaming API is designed for efficiently handling large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once. When decoding a chunked-transfer-encoded response, this API reads each chunk's size field by buffering until ...

PT-2026-105920

Impact urllib3's streaming API is designed for efficiently handling large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once. When decoding a chunked-transfer-encoded response, this API reads each chunk's size field by buffering until...

GHSA-VXQ7-64XX-V4GW urllib3: HTTPResponse.stream()/read_chunked() buffers an unbounded chunk-size line into memory

Impact urllib3's streaming API is designed for efficiently handling large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once. When decoding a chunked-transfer-encoded response, this API reads each chunk's size field by buffering until...

urllib3: HTTPResponse.stream()/read_chunked() buffers an unbounded chunk-size line into memory

Impact urllib3's streaming API is designed for efficiently handling large HTTP responses by reading the content in chunks, rather than loading the entire response body into memory at once. When decoding a chunked-transfer-encoded response, this API reads each chunk's size field by buffering until...

Allocation of Resources Without Limits or Throttling

Overview urllib3 is a HTTP library with thread-safe connection pooling, file post, and more. Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via HTTPResponse.updatechunklength in response.py, where the chunk-size line in a chunked...

Apache Tomcat Chunked Transfer Denial of Service - Ver 2 (CVE-2012-3544)

A denial of service vulnerability has been identified in Apache Tomcat as it processes Chunked-Transfer encoded requests. The error is caused by Tomcat not discarding any extensions included in very long Chunked-transfer requests, even if they were not processed. A remote attacker could exploit...