CVE-2026-102559
highA flaw was found in libsoup.
Vendor / product: 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.
CVSS
8.6
8.6 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-09-29 18:17
Modified: 2026-10-19 05:17
NVD status: Modified
Last synced 2 days ago
Verified against the source API 2026-10-27 06:56 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
gnome / libsoup <3.7.3
redhat / enterprise_linux 7.0, 8.0, 9.0, 10.0
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Patch / mitigation: https://access.redhat.com/security/cve/CVE-2026-102559
Patch / mitigation: https://bugzilla.redhat.com/show_bug.cgi?id=2543285
References
- https://access.redhat.com/errata/RHSA-2026:83384 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:83618 secalert@redhat.com
- https://access.redhat.com/errata/RHSA-2026:84586 secalert@redhat.com
- https://access.redhat.com/security/cve/CVE-2026-102559 secalert@redhat.com
- https://bugzilla.redhat.com/show_bug.cgi?id=2543285 secalert@redhat.com
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:56 UTC · record ↗