What is CVE-2026-102556?

CVE-2026-102556 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 8.6/10. Published 2026-09-29.

How severe is CVE-2026-102556?

High severity. CVSS v3 base score is 8.6 out of 10.

Vulnerability in Red Hat Enterprise Linux 10

CVE-2026-102556

A flaw was found in libsoup. When handling an incoming WebSocket Pong frame, SoupWebsocketConnection emitted the ::pong signal with a GByteArray pointer even though the signal is declared to pass a GBytes. Applications connecting a handler that follows the documented GBytes API can trigger heap corruption or a crash upon receiving a crafted Pong.

Published 2026-09-29 · last modified 2026-09-29.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-843 — Access of Resource Using Incompatible Type (Type Confusion)

References

access.redhat.com/security/cve/CVE-2026-102556 (vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking)

Frequently asked questions

What is CVE-2026-102556?: CVE-2026-102556 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 8.6/10. Published 2026-09-29.
How severe is CVE-2026-102556?: High severity. CVSS v3 base score is 8.6 out of 10.