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Fencer Vulns
medium 6.5

CVE-2026-12706 json

Ffmpeg: ffmpeg: heap use-after-free read in rasc decoder decode_move()

published 2026-06-19 4 mo ago modified 2026-06-22 4 mo ago also EUVD-2026-38004

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

A use-after-free vulnerability was found in FFmpeg's RASC video decoder. The decode_move() function initializes a read pointer into a decompressed buffer, but a subsequent reallocation of that same buffer during move-table processing leaves the pointer dangling. An attacker could exploit this by providing a specially crafted AVI file containing a malicious RASC video stream. When a user opens or plays the file, the decoder reads from freed heap memory, which could lead to a denial of service (crash).

Patch / fix

  • ffmpeg Debian 12 7:5.1.9-0+deb12u1
  • ffmpeg Debian 13 7:7.1.4-0+deb13u1
  • ffmpeg Debian 14 7:8.1.1-1

debian advisories DEBIAN-CVE-2026-12706

  • ffmpeg Ubuntu Pro 20.04 LTS 7:4.2.7-0ubuntu0.1+esm17
  • ffmpeg Ubuntu Pro 22.04 LTS 7:4.4.2-0ubuntu0.22.04.1+esm16

ubuntu advisories UBUNTU-CVE-2026-12706

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • ffmpeg-4 SLE Workstation Extension 15 SP7, SLE Module for Package Hub 15 SP7 4.4.8-150600.13.52.1
  • ffmpeg-4 SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 4.4.8-150400.3.72.1

suse advisories SUSE-SU-2026:3542-1SUSE-SU-2026:3529-1

  • ffmpeg-7 openSUSE Leap 16.0 7.1.5-160000.1.1
  • ffmpeg-9 openSUSE Tumbleweed 9.0.1-1.1
  • ffmpeg-4 openSUSE Tumbleweed 4.4.8-2.1
  • ffmpeg-7 openSUSE Tumbleweed 7.1.4-5.1
  • ffmpeg-8 openSUSE Tumbleweed 8.1.2-2.1

opensuse advisories openSUSE-SU-2026:21877-1openSUSE-SU-2026:11515-1openSUSE-SU-2026:11360-1openSUSE-SU-2026:11361-1openSUSE-SU-2026:11347-1

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-2026-12706 updated cvss 6.5

ffmpeg: ffmpeg: heap use-after-free read in RASC decoder decode_move()

  • Red Hat Enterprise Linux AI (RHEL AI) 3 ffmpeg 6.1.5-2.el9ai, rhelai3/bootc-cuda-rhel9, rhelai3/bootc-rocm-rhel9, rhelai3/bootc-aws-cuda-rhel9, rhelai3/bootc-gcp-cuda-rhel9, rhelai3/bootc-azure-cuda-rhel9, +1 more Red Hat OpenShift AI (RHOAI) rhoai/odh-vllm-gaudi-rhel9
    affected: workaround, no fix available “If the RASC decoder is not needed, it can be disabled at build time with --disable-decoder=rasc. There is no runtime workaround that disables the decoder without rebuilding FFmpeg.”
  • Red Hat Enterprise Linux AI (RHEL AI) 3 nv-codec-headers 12.2.72.0-2.el9ai Red Hat OpenShift AI (RHOAI) rhoai/odh-openvino-model-server-rhel9
    not affected: vulnerable code not present

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
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3
  • Red Hat Red Hat OpenShift AI (RHOAI)

Classification

Weakness

References

Sources

Fencer Vulns 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.