UBUNTU-CVE-2026-85534

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    UBUNTU-CVE-2026-85534

    Published: 4 Sept 2026Last Modified: 18 Sept 2026
    Upstream:
    CVE-2026-85534

    Summary:

    Details: A flaw was found in libsoup. When a client sends an HTTP/2 request body from a non-pollable input stream, the library can buffer more data than the current flow-control window later allows. A malicious HTTP/2 server can shrink SETTINGS_INITIAL_WINDOW_SIZE while that buffered read is still in progress. The client then copies the full buffer into a smaller DATA callback without a runtime bounds check, which can abort the process or fail the HTTP/2 session.

    References: https://ubuntu.com/security/CVE-2026-85534, https://www.cve.org/CVERecord?id=CVE-2026-85534, https://gitlab.gnome.org/GNOME/libsoup/-/work_items/551, https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/561

    Affected packages

    Package

    Name: libsoup2.4

    Purl: pkg:deb/ubuntu/libsoup2.4?arch=source&distro=esm-infra-legacy%2Fxenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    2.50.0-2debian1

    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
    UBUNTU-CVE-2026-85534 | CVE-DB