CVE-2024-56431

Description

oc_huff_tree_unpack in huffdec.c in libtheora in Theora through 1.0 7180717 has an invalid negative left shift. NOTE: this is disputed by third parties because there is no evidence of a security impact, e.g., an application would not crash.

Is your site exposed to CVE-2024-56431?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-863 Incorrect Authorization

Affected Products

Vendor	Product	Versions
xiph	theora	< 1.2.0

References

Exploits

https://github.com/UnionTech-Software/libtheora-CVE-2024-56431-PoC

Other References

https://github.com/xiph/theora/blob/7180717276af1ebc7da15c83162d6c5d6203aabf/lib/huffdec.c#L193 https://github.com/xiph/theora/issues/17#issuecomment-2480630603 https://www.openwall.com/lists/oss-security/2025/04/25/6 http://www.openwall.com/lists/oss-security/2025/04/25/4 http://www.openwall.com/lists/oss-security/2025/04/25/6

Frequently Asked Questions

What is CVE-2024-56431? +

oc_huff_tree_unpack in huffdec.c in libtheora in Theora through 1.0 7180717 has an invalid negative left shift. NOTE: this is disputed by third parties because there is no evidence of a security impact, e.g., an application would not crash. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2024-56431? +

CVE-2024-56431 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2024-56431? +

CVE-2024-56431 affects products from xiph, specifically: theora. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-56431? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-50008

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. From version …

CVE-2026-60125

MISP’s importModule() path used getEnabledModule() to resolve a single import module by name, but this lookup did not enforce the …

CVE-2026-42571

Pelican is a platform for creating data federations. From versions 7.21.0 to before 7.21.5, 7.22.0 to before 7.22.3, 7.23.0 to …

CVE-2026-42137

Kirby is an open-source content management system. Prior to versions 4.9.0 and 5.4.0, `pages.access/list` and `files.access/list` permissions are not consistently …

CVE-2026-54358

An incorrect authorization vulnerability in MISP allows an organization administrator to target site administrator accounts belonging to the same organization …

CVE-2026-42160

Data Space Portal is an open-source Software as a Service (SaaS) solution designed to streamline Dataspace management. From version 2.1.1 …