CVE-2026-5673 Libtheora: libtheora: denial of service or information disclosure via malformed avi file processing
A local attacker can cause a crash or leak heap memory by tricking a user into opening a malformed AVI file processed by libtheora.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-5673?
CVE-2026-5673 is a medium-severity vulnerability in Redhat Enterprise Linux, published on 6 Apr 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
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 user into opening a specially crafted AVI file containing a truncated header sub-chunk. This could lead to a denial-of-service (application crash) or potentially leak sensitive information from the heap.
Weakness: CWE-125
Which versions are affected by CVE-2026-5673?
It affects 2 products.
Products include Redhat Enterprise Linux, Xiph Theora.
How do I fix CVE-2026-5673?
Apply the vendor's patch.
Is CVE-2026-5673 being exploited?
There is no known exploitation of CVE-2026-5673 in the wild and no public exploit code.
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- CVE-2018-14667 Red Hat JBoss RichFaces Framework Expression Language Injection
- CVE-2021-20325 Missing fixes for CVE-2021-40438 and CVE-2021-26691 in the versions of httpd, as shipped in Red Hat Enterprise Linux 8.5.0, causes a securit
- CVE-2018-25011 Memory corruption in libwebp
- CVE-2018-25014 Other in libwebp
- CVE-2014-3585 Supply chain in redhat-upgrade-tool
Sources
Also known as DEBIAN-CVE-2026-5673, ECHO-5fc2-c517-ff68, GHSA-cjcp-vc46-rm2h, OESA-2026-2210, ROOT-OS-DEBIAN-13-CVE-2026-5673, UBUNTU-CVE-2026-5673.