What is CVE-2026-102558?

CVE-2026-102558 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Out-of-bounds Read. CVSS score: 8.6/10. Published 2026-09-29.

How severe is CVE-2026-102558?

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

Out-of-bounds Read in Red Hat Enterprise Linux 10

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.

Vulnerability class: Buffer Overflow

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-125 — Out-of-bounds Read

References

access.redhat.com/security/cve/CVE-2026-102558 (vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking)

Frequently asked questions

What is CVE-2026-102558?: CVE-2026-102558 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under Out-of-bounds Read. CVSS score: 8.6/10. Published 2026-09-29.
How severe is CVE-2026-102558?: High severity. CVSS v3 base score is 8.6 out of 10.