Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/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
Remote crafted media reaches the decoder with no auth or UI in automated pipelines (AV:N/AC:L/PR:N/UI:N); OOB read gives limited C/I, while the heap OOB write primarily yields crash/corruption (A:H).
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/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
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Out-of-bounds heap write in FFmpeg's RASC video decoder (decode_dlta in libavcodec/rasc.c) allows attackers to corrupt memory when libavcodec decodes a crafted stream using the RASC FourCC. The decoder performs 32-bit reads/writes at the row cursor before the NEXT_LINE boundary check and validates DLTA regions in pixel rather than byte units, letting a DLTA run on a PAL8 frame write and read several bytes past the row allocation. Publicly available exploit code exists (reported by VulnCheck); no public active exploitation has been identified at time of analysis.
Technical ContextAI
FFmpeg/libavcodec is the de-facto multimedia decoding library embedded in countless players, browsers, servers, and transcoding pipelines. The affected component is the RASC (Windows/Asus screen-capture style) decoder, specifically its DLTA delta-frame handling for PAL8 (8-bit palettized) frames. The root cause is CWE-787 (Out-of-bounds Write): the code advances and dereferences a 32-bit row cursor and emits writes before performing the NEXT_LINE row-boundary check, and it bounds the DLTA copy region in pixel counts rather than byte counts. Because each PAL8 pixel maps to one byte while the cursor operations are 32-bit, the byte/pixel mismatch plus the deferred boundary check let a bitstream-controlled DLTA run spill past the allocated row buffer, producing both an adjacent out-of-bounds read and a heap out-of-bounds write fully driven by attacker-controlled stream data.
RemediationAI
No vendor-released patched version is identified in the provided data, so an exact fix version cannot be cited - monitor the FFmpeg project (libavcodec/rasc.c) and the VulnCheck advisory at https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-write-in-rasc-decoder-decode-dlta for the patched release and upgrade to it once published. As an immediate compensating control, disable or blacklist the RASC decoder where it is not needed (FFmpeg's -decoders/whitelist controls or build-time configuration with --disable-decoder=rasc), which removes the attack surface entirely with the trade-off of losing RASC playback. For transcoding/upload services, restrict accepted input to an explicit codec allowlist and reject or sandbox RASC/unknown FourCC streams; run decoding in a hardened, isolated process (seccomp, low-privilege container, memory limits) so an OOB write degrades to a contained crash rather than host compromise, at the cost of added pipeline complexity. Building libavcodec with hardening (ASAN in test, fortify/stack protections, and heap-hardening allocators in production) further raises exploitation difficulty.
FFmpeg 2.x allows remote attackers to conduct cross-origin attacks and read arbitrary files by using the concat protocol
FFmpeg before 2.8.12, 3.0.x and 3.1.x before 3.1.9, 3.2.x before 3.2.6, and 3.3.x before 3.3.2 does not properly restric
FFmpeg 2.x allows remote attackers to conduct cross-origin attacks and read arbitrary files by using the subfile protoco
The av_reallocp_array function in libavutil/mem.c in FFmpeg before 2.0.1 has an unspecified impact and remote vectors re
cbs_jpeg_split_fragment in libavcodec/cbs_jpeg.c in FFmpeg 4.1 and 4.2.2 has a heap-based buffer overflow during JPEG_MA
Integer Overflow vulnerability in function filter_sobel in libavfilter/vf_convolution.c in Ffmpeg 4.2.1, allows attacker
Integer Overflow vulnerability in function filter_robert in libavfilter/vf_convolution.c in Ffmpeg 4.2.1, allows attacke
Integer Overflow vulnerability in function filter_prewitt in libavfilter/vf_convolution.c in Ffmpeg 4.2.1, allows attack
Integer Overflow vulnerability in function filter16_sobel in libavfilter/vf_convolution.c in Ffmpeg 4.2.1, allows attack
Integer Overflow vulnerability in function filter16_roberts in libavfilter/vf_convolution.c in Ffmpeg 4.2.1, allows atta
FFmpeg <=4.3 contains a buffer overflow vulnerability in libavcodec through a crafted file that may lead to remote code
FFmpeg through 4.2 has a "Conditional jump or move depends on uninitialised value" issue in h2645_parse because alloc_rb
Same weakness CWE-787 – Out-of-bounds Write
View allSame technique Memory Corruption
View allVendor StatusVendor
Debian
| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| bullseye | vulnerable | 7:4.3.7-0+deb11u1 | - |
| bullseye (security) | vulnerable | 7:4.3.9-0+deb11u2 | - |
| bookworm | vulnerable | 7:5.1.8-0+deb12u1 | - |
| bookworm (security) | vulnerable | 7:5.1.9-0+deb12u1 | - |
| trixie | vulnerable | 7:7.1.3-0+deb13u1 | - |
| trixie (security) | vulnerable | 7:7.1.5-0+deb13u1 | - |
| forky, sid | vulnerable | 7:8.1.2-2 | - |
| (unstable) | fixed | (unfixed) | - |
SUSE
Severity: Important| Product | Status |
|---|---|
| SUSE Linux Enterprise Desktop 15 SP7 | Not-Affected |
| SUSE Linux Enterprise Desktop 15 SP7 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | Not-Affected |
| SUSE Linux Enterprise Module for Desktop Applications 15 SP7 | Not-Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | Not-Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | Affected |
| SUSE Linux Enterprise Server 15 SP7 | Not-Affected |
| SUSE Linux Enterprise Server 15 SP7 | Affected |
| SUSE Linux Enterprise Server 16.0 | Affected |
| SUSE Linux Enterprise Server 16.1 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.0 | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP7 | Not-Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP7 | Affected |
| openSUSE Leap 16.0 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4 | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | Not-Affected |
| SUSE Linux Enterprise Module for Desktop Applications 15 SP4 | Not-Affected |
| SUSE Linux Enterprise Module for Desktop Applications 15 SP4 | Affected |
| SUSE Linux Enterprise Module for Desktop Applications 15 SP5 | Not-Affected |
| SUSE Linux Enterprise Module for Desktop Applications 15 SP6 | Not-Affected |
| SUSE Linux Enterprise Server 15 SP4 | Not-Affected |
| SUSE Linux Enterprise Server 15 SP4 | Affected |
| SUSE Linux Enterprise Server 15 SP4-LTSS | Not-Affected |
| SUSE Linux Enterprise Server 15 SP4-LTSS | Affected |
| SUSE Linux Enterprise Server 15 SP5 | Not-Affected |
| SUSE Linux Enterprise Server 15 SP5 | Affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | Not-Affected |
| SUSE Linux Enterprise Server 15 SP6 | Not-Affected |
| SUSE Linux Enterprise Server 15 SP6 | Affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | Affected |
| SUSE Manager Proxy 4.3 | Not-Affected |
| SUSE Manager Proxy 4.3 | Affected |
| SUSE Manager Retail Branch Server 4.3 | Not-Affected |
| SUSE Manager Retail Branch Server 4.3 | Affected |
| SUSE Manager Server 4.3 | Not-Affected |
| SUSE Manager Server 4.3 | Affected |
| SUSE CaaS Platform 4.0 | Not-Affected |
| SUSE Enterprise Storage 6 | Not-Affected |
| SUSE Enterprise Storage 7 | Not-Affected |
| SUSE Enterprise Storage 7.1 | Not-Affected |
| SUSE Linux Enterprise Desktop 15 | Not-Affected |
| SUSE Linux Enterprise Desktop 15 SP1 | Not-Affected |
| SUSE Linux Enterprise Desktop 15 SP2 | Not-Affected |
| SUSE Linux Enterprise Desktop 15 SP3 | Not-Affected |
| SUSE Linux Enterprise Desktop 15 SP4 | Not-Affected |
| SUSE Linux Enterprise Desktop 15 SP4 | Affected |
| SUSE Linux Enterprise Desktop 15 SP5 | Not-Affected |
| SUSE Linux Enterprise Desktop 15 SP5 | Affected |
| SUSE Linux Enterprise Desktop 15 SP6 | Not-Affected |
| SUSE Linux Enterprise Desktop 15 SP6 | Affected |
| SUSE Linux Enterprise High Performance Computing 15 | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1 | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2 | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3 | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15-ESPOS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15-LTSS | Not-Affected |
| SUSE Linux Enterprise Module for Desktop Applications 15 | Not-Affected |
| SUSE Linux Enterprise Module for Desktop Applications 15 SP1 | Not-Affected |
| SUSE Linux Enterprise Module for Desktop Applications 15 SP2 | Not-Affected |
| SUSE Linux Enterprise Module for Desktop Applications 15 SP3 | Not-Affected |
| SUSE Linux Enterprise Module for Package Hub 15 | Not-Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP1 | Not-Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP2 | Not-Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP3 | Not-Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP4 | Not-Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP4 | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | Not-Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | Not-Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | Affected |
| SUSE Linux Enterprise Real Time 15 SP2 | Not-Affected |
| SUSE Linux Enterprise Real Time 15 SP3 | Not-Affected |
| SUSE Linux Enterprise Real Time 15 SP4 | Not-Affected |
| SUSE Linux Enterprise Real Time 15 SP4 | Affected |
| SUSE Linux Enterprise Server 15 | Not-Affected |
| SUSE Linux Enterprise Server 15 SP1 | Not-Affected |
| SUSE Linux Enterprise Server 15 SP1-BCL | Not-Affected |
| SUSE Linux Enterprise Server 15 SP1-LTSS | Not-Affected |
| SUSE Linux Enterprise Server 15 SP2 | Not-Affected |
| SUSE Linux Enterprise Server 15 SP2-BCL | Not-Affected |
| SUSE Linux Enterprise Server 15 SP2-LTSS | Not-Affected |
| SUSE Linux Enterprise Server 15 SP3 | Not-Affected |
| SUSE Linux Enterprise Server 15 SP3-BCL | Not-Affected |
| SUSE Linux Enterprise Server 15 SP3-LTSS | Not-Affected |
| SUSE Linux Enterprise Server 15-LTSS | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | Affected |
| SUSE Linux Enterprise Workstation Extension 15 | Not-Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP1 | Not-Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP2 | Not-Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP3 | Not-Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP4 | Not-Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP4 | Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP5 | Not-Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP5 | Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP6 | Not-Affected |
| SUSE Linux Enterprise Workstation Extension 15 SP6 | Affected |
| SUSE Manager Proxy 4.0 | Not-Affected |
| SUSE Manager Proxy 4.1 | Not-Affected |
| SUSE Manager Proxy 4.2 | Not-Affected |
| SUSE Manager Retail Branch Server 4.0 | Not-Affected |
| SUSE Manager Retail Branch Server 4.1 | Not-Affected |
| SUSE Manager Retail Branch Server 4.2 | Not-Affected |
| SUSE Manager Server 4.0 | Not-Affected |
| SUSE Manager Server 4.1 | Not-Affected |
| SUSE Manager Server 4.2 | Not-Affected |
| openSUSE Leap 15.3 | Not-Affected |
| openSUSE Leap 15.4 | Not-Affected |
| openSUSE Leap 15.4 | Affected |
| openSUSE Leap 15.5 | Not-Affected |
| openSUSE Leap 15.5 | Affected |
| openSUSE Leap 15.6 | Not-Affected |
| openSUSE Leap 15.6 | Affected |
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-39969
GHSA-mjxr-6gqf-w78h