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High ALAS2023-2026-3159 1 CVE

Important: python-hpack security update (Amazon Linux 2023)

Published Oct 12, 2026 · Updated Oct 12, 2026

Ecosystem: Amazon Linux

Summary

Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2026-59980: A flaw was found in hpack, an HTTP/2 Header Encoding for Python. Unbounded variable integer decoding can lead to excessive computation when processing specially crafted, malformed input. A remote attacker could exploit this vulnerability to cause a denial of service by effectively blocking further processing within the affected component.

Fixed packages 1

ReleasePackageFixed in
Amazon Linux · 2023 python3-hpack 0:4.0.0-2.amzn2023.0.3

Vulnerabilities 1

  • Medium 6.3
    CVE-2026-59980

    hpack: Unbounded variable integer decoding can cause run-away computation on malformed input

    hpack is an HTTP/2 Header Encoding for Python. Prior to version 4.2.0, unbounded variable integer decoding can cause run-away computation on malformed input leading to O(n^2) runtime, effectively blocking further processing with large enough unsanitized input…

    python-hyper hpack python-hpack hpack Debian Ubuntu PyPI

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-59980.html