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Vulnerability record · CVE-2026-102559 · published 29 September 2026

CVE-2026-102559: Gnome libsoup out-of-bounds read vulnerability

Gnome · Libsoup

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.

8.6 CVSS 3.1 High EPSS 0.63% · top 49.6% CWE-125 · Out-of-bounds read
8.6CVSS 3.1 base score
0.63%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
15References
11 Nov 2026Last modified by NVD

Description

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:83384 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:83618 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:84586
https://access.redhat.com/errata/RHSA-2026:92347
https://access.redhat.com/errata/RHSA-2026:93445
https://access.redhat.com/errata/RHSA-2026:93446
https://access.redhat.com/errata/RHSA-2026:93447
https://access.redhat.com/errata/RHSA-2026:93465
https://access.redhat.com/errata/RHSA-2026:93466
https://access.redhat.com/errata/RHSA-2026:93583
https://access.redhat.com/errata/RHSA-2026:93716
https://access.redhat.com/errata/RHSA-2026:98453
https://access.redhat.com/errata/RHSA-2026:98560
https://access.redhat.com/security/cve/CVE-2026-102559 MitigationThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2543285 Issue TrackingPatchThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-102559), CISA KEV, FIRST EPSS (scores of 2026-11-11). This page is refreshed as NVD updates the record.