8.6 High

CVE-2026-102558 Libsoup: libsoup: heap buffer overflow during websocket receive-buffer growth

Description

A flaw was found in libsoup. When max-incoming-payload-size is unlimited (0), SoupWebsocketConnection could grow its incoming GByteArray based on an attacker-controlled frame length until the length wrapped, causing a heap buffer overflow while reading frame data.

CVSS 3.1 detail

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Exploitable remotely over the network, without an account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector: Network
Attack complexity: Low
Privileges required: None
Interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: Low
Availability: High

Affected products and versions

Product	Affected versions	Fixed in
Red Hat Enterprise Linux 10	Versions not published
Red Hat Enterprise Linux 6	Versions not published
Red Hat Enterprise Linux 7	Versions not published
Red Hat Enterprise Linux 8	Versions not published
Red Hat Enterprise Linux 9	Versions not published
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	Versions not published
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	Versions not published
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	Versions not published
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	Versions not published

Show the 7 other branches

Product	Affected versions	Fixed in
Red Hat Enterprise Linux 8.8 Telecommunications Update Service	Versions not published
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	Versions not published
Red Hat Enterprise Linux 7 Extended Lifecycle Support	Versions not published
Red Hat Enterprise Linux 9.6 Extended Update Support	Versions not published
Red Hat Enterprise Linux 10.0 Extended Update Support	Versions not published
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	Versions not published
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	Versions not published

References

RHSA-2026:83384 access.redhat.com
RHSA-2026:83618 access.redhat.com
RHSA-2026:84586 access.redhat.com
RHSA-2026:92347 access.redhat.com
RHSA-2026:93445 access.redhat.com
RHSA-2026:93446 access.redhat.com
RHSA-2026:93447 access.redhat.com
RHSA-2026:93465 access.redhat.com
RHSA-2026:93466 access.redhat.com
RHSA-2026:93583 access.redhat.com
RHSA-2026:93716 access.redhat.com
access.redhat.com access.redhat.com
RHBZ#2543274 bugzilla.redhat.com

Timeline

Published September 29, 2026
Last modified November 4, 2026

The 1454 CVEs of Red Hat Enterprise Linux 10 →

CVE-2026-123151 Gdb: gdb: stack buffer overflow in parse_tsv_definition via stale rs->buf tail Not rated CVE-2026-121997 Gdb: gdbserver: heap buffer overflow in cmd_qtdpsrc via qtdpsrc declared/actual length mismatch 8.1 High CVE-2026-121996 Gdb: gdbserver: heap disclosure and wild pointer in gdb_parse_agent_expr via untrusted agent-expression length 8.2 High CVE-2026-121995 Gdb: gdb: stack buffer overflow in parse_tracepoint_definition via stale rs->buf tail 7.5 High

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