CVE-2024-56431
criticalpriority · track · 11OT risk · elevatedEPSS 0.018 · 79 %ileexploit · PoCEURUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
exploits (1)
Public proof-of-concept and weaponised exploit code.
affected products (3)
Products and version ranges known to be affected.
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (14)
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/cve-2024-56431cnnvd
- https://github.com/UnionTech-Software/libtheora-CVE-2024-56431-PoCcnnvd
- https://github.com/xiph/theora/blob/7180717276af1ebc7da15c83162d6c5d6203aabf/lib/huffdec.c#L193cnnvd
- https://github.com/xiph/theora/issues/17#issuecomment-2480630603cnnvd
- https://github.com/UnionTech-Software/libtheora-CVE-2024-56431-PoCenisa_euvd
- https://github.com/xiph/theora/blob/7180717276af1ebc7da15c83162d6c5d6203aabf/lib/huffdec.c#L193enisa_euvd
- https://github.com/xiph/theora/issues/17#issuecomment-2480630603enisa_euvd
- https://www.openwall.com/lists/oss-security/2025/04/25/6enisa_euvd
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