CVE-2024-56431

Exp

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.

Published: 2024-12-25 Last update: 2025-04-25 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-56431 is rated High Exploit Risk (87/100): CVSS Critical severity, with high exploitation likelihood (EPSS 14.36%, 95th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2024-56431

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2024-56431

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-03 14.69% 14.36% -0.33%
2 2026-05-22 14.36% 14.69% +0.33%
3 2026-05-16 — 14.36% —

Full EPSS history (35 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-56431

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2024-56431

OS Trackers for CVE-2024-56431

vendor priority summary link
debian unimportant CVE-2024-56431 unimportant priority: Debian including 1 source packages (libtheora), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2024-56431
redhat low — https://access.redhat.com/security/cve/CVE-2024-56431
suse medium — https://www.suse.com/security/cve/CVE-2024-56431/
ubuntu medium CVE-2024-56431 medium priority: Ubuntu including 1 source packages (libtheora), 8 status rows across 8 suites (bionic, focal, jammy, noble, oracular, plucky, upstream, xenial): not-affected 7, released 1. https://ubuntu.com/security/CVE-2024-56431

Affected software / configurations for CVE-2024-56431

Vendor Product Version Raw CPE
xiph theora < 1.2.0 cpe:2.3:a:xiph:theora:*:*:*:*:*:*:*:*

References for CVE-2024-56431

cvelogic Threat Intelligence