DEBIAN-CVE-2026-85024

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    DEBIAN-CVE-2026-85024

    Published: 4 Sept 2026Last Modified: 17 Sept 2026
    Upstream:
    CVE-2026-85024

    Summary:

    Details: undici bundles a WebSocket client whose permessage-deflate size-limit cleanup removes all listeners from the internal zlib inflate stream, including its error listener, while that stream can still emit. When a remote peer sends a compressed payload that crosses the built-in 128 MiB decompressed-payload limit and then contains a malformed DEFLATE byte, the inflate stream emits a data error with no listener attached, which Node.js treats as a fatal unhandled error and terminates the entire process. Exploitation is remote and unauthenticated, requires no application mistake, and is asymmetric, since roughly 130 KB on the wire expands past the limit and crashes the process, and reconnecting can repeat the crash. This affects undici versions from 6.25.0 up to 6.28.1, from 7.28.0 up to 7.29.1, and from 8.1.0 up to 8.10.2. Users should upgrade to undici 6.28.1, 7.29.1, or 8.10.2.

    References: https://security-tracker.debian.org/tracker/CVE-2026-85024

    Affected packages

    Package

    Name: node-undici

    Purl: pkg:deb/debian/node-undici?arch=source&distro=bookworm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    5.15.0+dfsg1+~cs20.10.9.3-1
    5.15.0+dfsg1+~cs20.10.9.3-1+deb12u1
    5.15.0+dfsg1+~cs20.10.9.3-1+deb12u2
    5.15.0+dfsg1+~cs20.10.9.3-1+deb12u3
    5.15.0+dfsg1+~cs20.10.9.3-1+deb12u4

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    DEBIAN-CVE-2026-85024 | CVE-DB