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Fencer Intel
critical 9.8

CVE-2024-56431 json

oc_huff_tree_unpack in huffdec.c in libtheora in Theora through 1.0 7180717 has an invalid negative left shift.

published last yr. modified 4mo ago also EUVD-2024-53141

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

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.

Patch / fix

  • xiph theora 1.2.0
  • libtheora Debian 14, Debian 13 1.2.0~alpha1+dfsg-6

debian advisories DEBIAN-CVE-2024-56431

  • mozjs60 SLE Module for Desktop Applications 15 SP6, SLE Module for Basesystem 15 SP6, SLE Micro 5.4 +4 more 60.9.0-150200.6.3.1
  • mozjs115 SLE Module for Desktop Applications 15 SP6, openSUSE Leap 15.6 115.4.0-150600.3.9.1
  • mozjs78 SLE Module for Package Hub 15 SP6, openSUSE Leap 15.6 78.15.0-150400.3.14.1
  • mozjs52 SLE Module for Package Hub 15 SP6, openSUSE Leap 15.6 52.6.0-150000.3.6.1

suse advisories SUSE-SU-2025:1365-1SUSE-SU-2025:1340-1SUSE-SU-2025:1288-1SUSE-SU-2025:1287-1

  • mozjs102 Package Hub 15 SP6, openSUSE Leap 15.6 102.15.1-bp156.3.3.1
  • mozjs128 openSUSE Tumbleweed 128.9.0-2.1
  • mozjs115 openSUSE Tumbleweed 115.15.0-5.1
  • libtheora openSUSE Tumbleweed 1.2.0-1.1

opensuse advisories openSUSE-SU-2025:0147-1openSUSE-SU-2025:15009-1openSUSE-SU-2025:15002-1openSUSE-SU-2025:14957-1

Is CVE-2024-56431 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2024-56431 updated cvss 3.3

libtheora: incorrect bitwise shift in huffdec.c

  • Red Hat Enterprise Linux 6 libtheora, theora-tools Red Hat Enterprise Linux 7 firefox, libtheora, thunderbird, theora-tools
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 firefox, libtheora, thunderbird, theora-tools Red Hat Enterprise Linux 9 firefox, libtheora, firefox-x11, thunderbird, theora-tools Red Hat Enterprise Linux 10 libtheora
    affected: no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
last yr.

Exploit prediction

1.84% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/UnionTech-Software/libtheora-CVE-2024-56431-PoC referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.