high 8.8

CVE-2026-64830 json

FFmpeg 2.1 - 8.1.2 Heap Buffer Overflow via VobSub Subtitle Demuxer

published 2026-07-22 3 mo ago modified 2026-10-24 15 d ago also EUVD-2026-47747 , GHSA-jphx-q7f7-4x8r , JLSEC-2026-1172

cvss: 8.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 51%
public exploits: 0; none known

FFmpeg versions 2.1 through 8.1.2 contains a heap buffer overflow vulnerability in the VobSub subtitle demuxer that allows attackers to corrupt adjacent heap memory by supplying a malicious .sub/.idx subtitle file declaring more distinct stream IDs than the fixed-size array bounds in libavformat/mpeg.c. Attackers can craft a subtitle file with excessive distinct stream IDs to trigger unbounded writes beyond the vobsub->q[] array boundary via ff_subtitles_queue_insert(), potentially achieving arbitrary code execution in any application using FFmpeg's VobSub demuxer.

Patch / fix

fixed in 3 distros 5 links 2

julia FFMPEG_jll 9.0.0+0
julia FFMPEG_nogpl_jll 9.0.0+0
julia FFplay_jll 9.0.0+0

debian ubuntu red hat suse opensuse

ffmpeg Debian 14 7:9.0.2-1

debian advisories DEBIAN-CVE-2026-64830

ffmpeg Ubuntu Pro 16.04 LTS 7:2.8.17-0ubuntu0.1+esm17
ffmpeg Ubuntu Pro 18.04 LTS 7:3.4.11-0ubuntu0.1+esm15
ffmpeg Ubuntu Pro 20.04 LTS 7:4.2.7-0ubuntu0.1+esm16
ffmpeg Ubuntu Pro 22.04 LTS 7:4.4.2-0ubuntu0.22.04.1+esm15
ffmpeg Ubuntu Pro 24.04 LTS 7:6.1.1-3ubuntu5+esm13
ffmpeg Ubuntu Pro 26.04 LTS 7:8.0.1-3ubuntu2+esm4

ubuntu advisories UBUNTU-CVE-2026-64830

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 enterprise linux ai 3.5, enterprise linux ai 3.4, enterprise linux ai 3.3 +1 more 6.1.6-9.el9ai
ffmpeg-free-rhai enterprise linux ai 3.5, enterprise linux ai 3.4, enterprise linux ai 3.3 +1 more 6.1.6-9.el9ai
libavutil-free-rhai enterprise linux ai 3.5, enterprise linux ai 3.4, enterprise linux ai 3.3 +1 more 6.1.6-9.el9ai
libavcodec-free-rhai enterprise linux ai 3.5, enterprise linux ai 3.4, enterprise linux ai 3.3 +1 more 6.1.6-9.el9ai
libswscale-free-rhai enterprise linux ai 3.5, enterprise linux ai 3.4, enterprise linux ai 3.3 +1 more 6.1.6-9.el9ai
libavdevice-free-rhai enterprise linux ai 3.5, enterprise linux ai 3.4, enterprise linux ai 3.3 +1 more 6.1.6-9.el9ai
libavfilter-free-rhai enterprise linux ai 3.5, enterprise linux ai 3.4, enterprise linux ai 3.3 +1 more 6.1.6-9.el9ai
libavformat-free-rhai enterprise linux ai 3.5, enterprise linux ai 3.4, enterprise linux ai 3.3 +1 more 6.1.6-9.el9ai

red hat advisories RHSA-2026:74089 RHSA-2026:67309 RHSA-2026:67303 RHSA-2026:67276

ffmpeg-7 SLES 16.0, SLES for SAP applications 16.0 7.1.4-160000.3.1
ffmpeg SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +10 more 3.4.2-150200.11.73.1
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-2026:23222-1 SUSE-SU-2026:23232-1 SUSE-SU-2026:3552-1 SUSE-SU-2026:3542-1 SUSE-SU-2026:3529-1

ffmpeg-7 openSUSE Tumbleweed 7.1.5-2.1
ffmpeg-7 openSUSE Leap 16.0 7.1.4-160000.3.1
ffmpeg-4 openSUSE Tumbleweed 4.4.8-3.1
ffmpeg-4 openSUSE Leap 16.0 4.4.7-bp160.3.1

opensuse advisories openSUSE-SU-2026:11665-1 openSUSE-SU-2026:21572-1 openSUSE-SU-2026:11448-1 openSUSE-SU-2026:21522-1

code.ffmpeg.org/FFmpeg/FFmpeg@dbd495f commit
code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23657 patch

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-2026-64830 updated 2026-10-29 cvss 8.8

ffmpeg: FFmpeg: Arbitrary code execution via heap buffer overflow in VobSub subtitle demuxer.

Red Hat AI Inference Server rhaii/vllm-tpu-rhel9, rhaiis/vllm-cpu-rhel9, rhaiis/vllm-tpu-rhel9, rhaii/vllm-neuron-rhel9, rhaiis/vllm-spyre-rhel9, rhaiis/vllm-neuron-rhel9
affected: workaround, no fix planned “Will not fix”
Red Hat OpenShift AI (RHOAI) rhoai/odh-vllm-gaudi-rhel9, rhoai/odh-llm-d-kv-cache-rhel9, rhoai/odh-th06-cpu-torch291-py312-rhel9, rhoai/odh-th06-cuda130-torch291-py312-rhel9
affected: workaround, no fix available
Red Hat AI Inference Server 3.2 rhaiis/vllm-cuda-rhel9 1787860580, rhaiis/vllm-rocm-rhel9 1787884873, rhaiis/model-opt-cuda-rhel9 1787772157
fixed: vendor fix RHSA-2026:61628
Red Hat AI Inference Server 3.5 rhaii/vllm-cpu-rhel9 1791473614, rhaii/vllm-cuda-rhel9 1791473631, rhaii/vllm-rocm-rhel9 1791425869, rhaii/vllm-gaudi-rhel9 1791427182, rhaii/vllm-spyre-rhel9 1791818357, rhaii/model-opt-cuda-rhel9 1791803821
fixed: vendor fix RHSA-2026:82066
Red Hat Enterprise Linux AI 3.0 for RHEL 9 ffmpeg 6.1.6-9.el9ai, ffmpeg-free-rhai 6.1.6-9.el9ai, libavutil-free-rhai 6.1.6-9.el9ai, libavcodec-free-rhai 6.1.6-9.el9ai, libswscale-free-rhai 6.1.6-9.el9ai, libavdevice-free-rhai 6.1.6-9.el9ai, +4 more
fixed: vendor fix RHSA-2026:74089
Red Hat Enterprise Linux AI 3.3 for RHEL 9 ffmpeg 6.1.6-9.el9ai, ffmpeg-free-rhai 6.1.6-9.el9ai, libavutil-free-rhai 6.1.6-9.el9ai, libavcodec-free-rhai 6.1.6-9.el9ai, libswscale-free-rhai 6.1.6-9.el9ai, libavdevice-free-rhai 6.1.6-9.el9ai, +4 more
fixed: vendor fix RHSA-2026:67276
Red Hat Enterprise Linux AI 3.4 for RHEL 9 ffmpeg 6.1.6-9.el9ai, ffmpeg-free-rhai 6.1.6-9.el9ai, libavutil-free-rhai 6.1.6-9.el9ai, libavcodec-free-rhai 6.1.6-9.el9ai, libswscale-free-rhai 6.1.6-9.el9ai, libavdevice-free-rhai 6.1.6-9.el9ai, +4 more
fixed: vendor fix RHSA-2026:67309
Red Hat Enterprise Linux AI 3.5 rhelai3/bootc-cuda-rhel9 1793135861, rhelai3/bootc-rocm-rhel9 1793135863, rhelai3/bootc-aws-cuda-rhel9 1793194817, rhelai3/bootc-gcp-cuda-rhel9 1793194815, rhelai3/disk-image-cuda-rhel9 1793206758, rhelai3/bootc-azure-cuda-rhel9 1793194815, +1 more
fixed: vendor fix RHSA-2026:92452

show 7 more

Red Hat Enterprise Linux AI 3.5 for RHEL 9 ffmpeg 6.1.6-9.el9ai, ffmpeg-free-rhai 6.1.6-9.el9ai, libavutil-free-rhai 6.1.6-9.el9ai, libavcodec-free-rhai 6.1.6-9.el9ai, libswscale-free-rhai 6.1.6-9.el9ai, libavdevice-free-rhai 6.1.6-9.el9ai, +4 more
fixed: vendor fix RHSA-2026:67303
Red Hat OpenShift AI 3.2 rhai/base-image-cpu-rhel9 1791232203, rhai/base-image-tpu-rhel9 1791231896, rhai/base-image-cuda-rhel9 1791232024, rhai/base-image-cuda-rhel9 1791818587, rhai/base-image-rocm-rhel9 1791231767, rhai/base-image-rocm-rhel9 1791231952, +1 more
fixed: vendor fix RHSA-2026:81128
Red Hat OpenShift AI 3.3 rhai/base-image-cpu-rhel9 1790703615, rhai/base-image-cpu-rhel9 1791232133, rhai/base-image-tpu-rhel9 1790703516, rhai/base-image-spyre-rhel9 1790703579, rhai/base-image-spyre-rhel9 1791231898, rhai/base-image-neuron-rhel9 1790703516, +6 more
fixed: vendor fix RHSA-2026:80732
Red Hat OpenShift AI 3.4 rhoai/odh-automl-rhel9 1791535789, rhoai/odh-autorag-rhel9 1791557539, rhoai/odh-mlserver-rhel9 1791446063, rhai/base-image-cpu-rhel9 1790703631, rhai/base-image-tpu-rhel9 1790703539, rhai/base-image-gaudi-rhel9 1790703553, +18 more
fixed: vendor fix RHSA-2026:74679
Red Hat OpenShift AI 3.5 rhai/base-image-cpu-rhel9 1790703656, rhai/base-image-tpu-rhel9 1790703554, rhai/base-image-gaudi-rhel9 1790703552, rhai/base-image-rubin-rhel9 1790703707, rhai/base-image-spyre-rhel9 1790703630, rhai/base-image-neuron-rhel9 1790703557, +3 more
fixed: vendor fix RHSA-2026:75652
Red Hat OpenShift AI (RHOAI) rhoai/odh-llama-stack-core-rhel9
not affected: component not present
Red Hat OpenShift AI 3.4 rhoai/odh-cli-rhel9 1791509689, rhoai/rhai-cli-rhel9 1791509689, rhoai/odh-mlflow-rhel9 1791865967, rhoai/odh-trainer-rhel9 1791869783, rhoai/odh-eval-hub-rhel9 1791852583, rhoai/odh-maas-api-rhel9 1791788707, +85 more
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: total
Assessed: 3 mo ago (2026-07-22)

Exploit prediction

0.65% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	8.7	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA	4.0	8.7	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
OSV	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
julia	FFMPEG_jll	<9.0.0+0	9.0.0+0
julia	FFMPEG_nogpl_jll	<9.0.0+0	9.0.0+0
julia	FFplay_jll	<9.0.0+0	9.0.0+0

Affected products

FFmpeg FFmpeg

Classification

Weakness

CWE-122 Heap-based Buffer Overflow

References

code.ffmpeg.org /FFmpeg/FFmpeg/commit/dbd495f066a85ba96b17433f4306582aa37c3951
patch, web
code.ffmpeg.org /FFmpeg/FFmpeg/pulls/23657
issue-tracking, patch, web
vulncheck.com /advisories/ffmpeg-heap-buffer-overflow-via-vobsub-subtitle-demuxer
third-party-advisory, web
github.com /advisories/GHSA-jphx-q7f7-4x8r
web
nvd.nist.gov /vuln/detail/CVE-2026-64830
web

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.

Summary