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High ALAS2023-2026-1734 1 CVE

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

Published May 25, 2026 · Updated May 26, 2026

Ecosystem: Amazon Linux

Summary

Package updates are available for Amazon Linux 2023 that fix the following vulnerabilities: CVE-2026-42304: The twisted.names module is vulnerable to a Denial of Service (DoS) attack via resource exhaustion during DNS name decompression. A remote, unauthenticated attacker can exploit this by sending a crafted TCP DNS packet containing deeply chained compression pointers. This flaw bypasses previous loop-prevention logic, causing the single-threaded Twisted reactor to hang while processing millions of recursive lookups, effectively freezing the server.

Fixed packages 2

ReleasePackageFixed in
Amazon Linux · 2023 python3-twisted 0:22.4.0-129.amzn2023.0.6
Amazon Linux · 2023 python3-twisted+tls 0:22.4.0-129.amzn2023.0.6

Vulnerabilities 1

  • High 7.5
    CVE-2026-42304

    Twisted: Denial of Service (DoS) in twisted.names via Crafted DNS Compression Pointer Chains

    Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.4.0rc2, the twisted.names module is vulnerable to a Denial of Service (DoS) attack via resource exhaustion during DNS name decompression. A remote, unauthentica…

    twisted twisted twisted twisted Debian Ubuntu Azure Linux PyPI

References

  • web
    https://alas.aws.amazon.com/cve/html/CVE-2026-42304.html