Description
FFmpeg's RASC video decoder (decode_dlta in libavcodec/rasc.c) performs 32-bit reads and writes at the row cursor before the NEXT_LINE row-boundary check and validates the DLTA region in pixel rather than byte units, so a DLTA run on a PAL8 frame can access several bytes past the row allocation. A crafted media stream using the RASC FourCC, decoded by libavcodec, triggers a bitstream-controlled out-of-bounds heap write and adjacent out-of-bounds read, leading to memory corruption.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| FFmpeg | FFmpeg | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | ffmpeg | 7:9.0.2-1 | — |
| Debian 13 | ffmpeg | No fix yet | — |
| Debian 12 | ffmpeg | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | ffmpeg | No fix yet | — |
| Ubuntu 25.10 | ffmpeg | No fix yet | — |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | ffmpeg | No fix yet | — |
| Ubuntu Pro 24.04 LTS | ffmpeg | No fix yet | — |
| Ubuntu Pro 22.04 LTS | ffmpeg | 7:4.4.2-0ubuntu0.22.04.1+esm16 | USN-8750-1 |
| Ubuntu Pro 20.04 LTS | ffmpeg | 7:4.2.7-0ubuntu0.1+esm17 | USN-8750-1 |
| Ubuntu Pro 18.04 LTS | ffmpeg | No fix yet | — |
| Ubuntu Pro 16.04 LTS | ffmpeg | No fix yet | — |
| Ubuntu Pro 14.04 LTS | libav | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux Ai 3 | ffmpeg +18 | 6.1.6-1.el9ai | RHSA-2026:74089, RHSA-2026:52833, RHSA-2026:52832 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | ffmpeg-4 | 4.4.8-150600.13.55.1 | SUSE-SU-2026:4149-1 |
| SLES 15 SP4 | ffmpeg-4 | 4.4.8-150400.3.75.1 | SUSE-SU-2026:4150-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP4 | ffmpeg-4 | 4.4.8-150400.3.75.1 | SUSE-SU-2026:4150-1 |
| SLE HPC 15 SP4 | ffmpeg-4 | 4.4.8-150400.3.75.1 | SUSE-SU-2026:4150-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | ffmpeg-4 | 4.4.8-4.1 | openSUSE-SU-2026:11563-1 |
| openSUSE Tumbleweed | ffmpeg-7 | 7.1.5-2.1 | openSUSE-SU-2026:11665-1 |
| openSUSE Tumbleweed | ffmpeg-8 | 8.1.2-3.1 | openSUSE-SU-2026:11682-1 |
| openSUSE Tumbleweed | ffmpeg-9 | 9.0.1-2.1 | openSUSE-SU-2026:11545-1 |
| openSUSE Leap 16.0 | ffmpeg-7 | 7.1.5-160000.1.1 | openSUSE-SU-2026:21877-1 |
Advisories 14
- RHSA-2026:74089 Red Hat Security Advisory: RHEL AI 3.0 RPM runtime CVE fix - ffmpeg Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:52833 Red Hat Security Advisory: RHELAI 3.2 Backport fixes for CVE-2026-64835 and CVE-2026-58049 Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:52832 Red Hat Security Advisory: RHELAI 3.0 Backport fixes for CVE-2026-64835 and CVE-2026-58049 Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:51180 Red Hat Security Advisory: Backport fixes for CVE-2026-64835 and CVE-2026-58049 Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:43711 Red Hat Security Advisory: RHEL AI 3.5 RPM runtime CVE fix - ffmpeg Red Hat Security Advisories (RHSA) · Oct 20, 2026
- WID-SEC-2026-2109 ffmpeg RASC video decoder): Schwachstelle ermöglicht Denial of Service und Speicherkorruption BSI CERT-Bund (WID) · Oct 12, 2026
- openSUSE-SU-2026:21877-1 Security update for ffmpeg-7 SUSE / openSUSE Security Updates · Sep 25, 2026
- SUSE-SU-2026:4149-1 Security update for ffmpeg-4 SUSE / openSUSE Security Updates · Sep 15, 2026
- SUSE-SU-2026:4150-1 Security update for ffmpeg-4 SUSE / openSUSE Security Updates · Sep 15, 2026
- USN-8750-1 ffmpeg vulnerabilities Ubuntu Security Notices (USN) · Sep 14, 2026
- openSUSE-SU-2026:11682-1 ffmpeg-8-8.1.2-3.1 on GA media SUSE / openSUSE Security Updates · Sep 5, 2026
- openSUSE-SU-2026:11665-1 ffmpeg-7-7.1.5-2.1 on GA media SUSE / openSUSE Security Updates · Sep 3, 2026
- openSUSE-SU-2026:11563-1 ffmpeg-4-4.4.8-4.1 on GA media SUSE / openSUSE Security Updates · Aug 22, 2026
- openSUSE-SU-2026:11545-1 ffmpeg-9-libavcodec-devel-9.0.1-2.1 on GA media SUSE / openSUSE Security Updates · Aug 21, 2026
References
- Proof of Concept exploit third-party-advisory
- libavcodec/rasc.c product
- VulnCheck Advisory: FFmpeg - Out-of-Bounds Write in RASC Decoder decode_dlta() third-party-advisory