CVE-2026-102556CWE-843

CVE-2026-102556

High · published September 29, 2026

CVSS v3.1
8.6
EPSS
0%
Percentile
18.7
In the wild
Unconfirmed
What it is

A flaw was found in libsoup. When handling an incoming WebSocket Pong frame, SoupWebsocketConnection emitted the ::pong signal with a GByteArray pointer even though the signal is declared to pass a GBytes. Applications connecting a handler that follows the documented GBytes API can trigger heap corruption or a crash upon receiving a crafted Pong.

The record
Technical detail
CVSS v3.1
8.6 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
CVSS v4.0
Not supplied
EPSS
0.00274 · 18.7th percentile
Weakness
CWE-843 · Access of Resource Using Incompatible Type ('Type Confusion')
Published
2026-09-29T21:17Z
Affected products (5)
ProductVersionsFixed in
gnome/libsoup< 3.7.33.7.3
redhat/enterprise_linuxall versions—
redhat/enterprise_linuxall versions—
redhat/enterprise_linuxall versions—
redhat/enterprise_linuxall versions—
References (5)
https://access.redhat.com/errata/RHSA-2026:83384 · [email protected]https://access.redhat.com/errata/RHSA-2026:83618 · [email protected]https://access.redhat.com/errata/RHSA-2026:84586 · [email protected]https://access.redhat.com/security/cve/CVE-2026-102556 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2543229 · [email protected]
EPSS history
Timeline
  • 01 OCT 03:44Z
    EPSS moved — → 0%
    epss
  • 29 SEP 16:11Z
    Libsoup: libsoup: heap buffer overflow from websocket pong signal type confusion
    cvelistv5