Amazon Linux 2023 Security Advisory: ALAS2023-2026-3184
Advisory Released Date: 2026-10-12
Advisory Updated Date: 2026-10-12
Severity:
Important
Issue Overview:
urllib3 is an HTTP client library for Python. From 1.10.3 until 2.8.0, the HTTPResponse.read_chunked and HTTPResponse.stream methods can allocate unbounded memory because the streaming chunk parser buffers the chunk-size field until newline or EOF without a length bound. The trigger is that a malicious server returns Transfer-Encoding: chunked followed by a very long run of bytes without a newline. The attack mechanism is that a malicious HTTP server sends a very long unterminated chunk-size line. The impact is that unbounded memory allocation can exhaust the client process. This issue is fixed in version 2.8.0. (CVE-2026-97689)
Affected Packages:
python-urllib3
Issue Correction:
Run dnf update python-urllib3 --releasever 2023.12.20261012 or dnf update --advisory ALAS2023-2026-3184 --releasever 2023.12.20261012 to update your system.
More information on how to update your system can be found on this page: Amazon Linux 2023 documentation
New Packages:
noarch:
python3-urllib3-1.25.10-5.amzn2023.0.9.noarch
src:
python-urllib3-1.25.10-5.amzn2023.0.9.src