What is CVE-2026-5673?

CVE-2026-5673 is a medium-severity vulnerability in Xiph Theora, classified under Out-of-bounds Read. CVSS score: 5.6/10. Published 2026-04-06.

How severe is CVE-2026-5673?

Medium severity. CVSS v3 base score is 5.6 out of 10.

Out-of-bounds Read in Xiph Theora

CVE-2026-5673

A flaw was found in libtheora. This heap-based out-of-bounds read vulnerability exists within the AVI (Audio Video Interleave) parser, specifically in the avi_parse_input_file() function. A local attacker could exploit this by tricking a u…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (0.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.6 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:H.

Affected products

Xiph Theora
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Redhat Enterprise_linux — versions 6.0, 7.0, 8.0

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

secalert@redhat.com (x_refsource_REDHAT, Third Party Advisory, vdb-entry)
RHBZ#2455340 (x_refsource_REDHAT, issue-tracking, Third Party Advisory, Issue Tracking)
secalert@redhat.com (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2026-5673?: CVE-2026-5673 is a medium-severity vulnerability in Xiph Theora, classified under Out-of-bounds Read. CVSS score: 5.6/10. Published 2026-04-06.
How severe is CVE-2026-5673?: Medium severity. CVSS v3 base score is 5.6 out of 10.