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python-h11 vulnerabilities

Vulnerabilities published for python-h11 in the last 30 days: 0. Listed in the KEV catalogue: 0.

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Vulnerability: 1

  1. CVE-2025-43859

    Critical · CVSS 9.1EPSS 0.59%Fix available

    h11 accepts some malformed Chunked-Encoding bodies

    h11 is a Python implementation of HTTP/1.1. Prior to version 0.16.0, a leniency in h11's parsing of line terminators in chunked-coding message bodies can lead to request smuggling vulnerabilities under certain conditions. This issue has been patched in version 0.16.0. Since exploitation requires the combination of buggy h11 with a buggy (reverse) proxy, fixing either component is sufficient to mitigate this issue.

    python-h11Operating systems
    • Update to 0.14.0-1.1~deb12u1
    Published Updated
    Source advisory 1 ↗Source advisory 2 ↗Source advisory 3 ↗

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