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ALSA-2026:83384 — Important: libsoup security update

Affected: AlmaLinux:9: libsoup, AlmaLinux:9: libsoup-devel

The libsoup packages provide an HTTP client and server library for GNOME.

Security Fix(es):

* libsoup: libsoup: Heap buffer overflow from WebSocket Pong signal type confusion (CVE-2026-102556) * libsoup: libsoup: Heap buffer overflow during WebSocket message reassembly (CVE-2026-102557) * libsoup: libsoup: Heap buffer overflow during WebSocket receive-buffer growth (CVE-2026-102558) * libsoup: libsoup: Heap buffer overflow during WebSocket client-frame masking (CVE-2026-102559) * libsoup: libsoup: Heap buffer overflow during outgoing permessage-deflate buffer growth (CVE-2026-102560)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

fkie_cve-2026-102559

A flaw was found in libsoup. When constructing a masked WebSocket client frame for a very large outgoing payload, size values passed to GByteArray allocation APIs could be truncated while the masking routine still used the full length, causing a heap buffer overflow.

GHSA-cj4p-f4hv-cp74

openSUSE-SU-2026:12084-1 — libsoup-2_4-1-2.74.3-24.1 on GA media

libsoup-2_4-1-2.74.3-24.1 on GA media

SUSE-SU-2026:4690-1 — Security update for libsoup

Security update for libsoup

UBUNTU-CVE-2026-102559

Affected: Ubuntu:Pro:16.04:LTS: libsoup2.4, Ubuntu:Pro:18.04:LTS: libsoup2.4, Ubuntu:Pro:20.04:LTS: libsoup2.4, Ubuntu:22.04:LTS: libsoup2.4, Ubuntu:Pro:22.04:LTS: libsoup3, Ubuntu:24.04:LTS: libsoup2.4, Ubuntu:24.04:LTS: libsoup3, Ubuntu:26.10: libsoup2.4, Ubuntu:26.10: libsoup3, Ubuntu:26.04:LTS: libsoup3 and 1 more