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    CVE-2026-102560

    A flaw was found in libsoup. When the permessage-deflate WebSocket extension compresses a very large outgoing message, truncated size calculations used for GByteArray growth could wrap, causing zlib to write past the allocated buffer and resulting in a heap buffer overflow.

    Published:Sep 29, 2026
    Last Modified:Oct 16, 2026
    EPS:Sep 29, 2026
    EPSS Score:0.00391
    CVSS Score:8.6

    Affected Products

    Vendor
    Gnome
    Product
    Libsoup
    Vendor
    Libsoup
    Product
    Libsoup
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2026-102559 (CVSS 8.6) — A flaw was found in libsoup. When constructing a masked WebSocket client frame for a very large outgoing paylo…
    CVE-2026-102558 (CVSS 8.6) — A flaw was found in libsoup. When max-incoming-payload-size is unlimited (0), SoupWebsocketConnection could gr…
    CVE-2026-102555 (CVSS 8.2) — A flaw was found in libsoup. The soup_uri_decode_data_uri() function incorrectly treated base64 data-URI paylo…
    CVE-2026-102557 (CVSS 8.6) — A flaw was found in libsoup. When reassembling fragmented WebSocket messages into a GByteArray, libsoup did no…
    CVE-2026-102556 (CVSS 8.6) — A flaw was found in libsoup. When handling an incoming WebSocket Pong frame, SoupWebsocketConnection emitted t…
    CVE-2026-85534 (CVSS 5.9) — A flaw was found in libsoup. When a client sends an HTTP/2 request body from a non-pollable input stream, the …
    CVE-2026-66337 (CVSS 6.5) — A flaw was found in libsoup. An unsigned integer underflow in the soup_filter_input_stream_read_until() functi…
    CVE-2026-66338 (CVSS 5.4) — A flaw was found in libsoup. The chunked transfer encoding parser uses a permissive parsing function for chunk…
    CVE-2026-66339 (CVSS 6.5) — A flaw was found in libsoup. After a CONNECT tunnel is established through an HTTP proxy, libsoup incorrectly …
    CVE-2026-12548 (CVSS 4.2) — A heap out-of-bounds read flaw was found in libsoup. When parsing multipart HTTP messages, an integer type mis…

    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
    CVE-2026-102560 — Gnome, Libsoup + (High 8.6) | CVE-DB