CVE-2026-102558

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

8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

EPSS

0.4% chance of exploitation in the next 30 days; higher than 32% of CVEs (scores of 2026-10-25)

CWE

CWE-125

Published

2026-09-29

Modified

2026-10-19

Record from

the NVD, synced 2026-10-19

Affected

• gnome:libsoup
• redhat:enterprise_linux

References

• https://access.redhat.com/errata/RHSA-2026:83384
• https://access.redhat.com/errata/RHSA-2026:83618
• https://access.redhat.com/errata/RHSA-2026:84586
• https://access.redhat.com/security/cve/CVE-2026-102558
• https://bugzilla.redhat.com/show_bug.cgi?id=2543274

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