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Fencer Vulns
high 8.6

CVE-2026-58049 json

FFmpeg - Out-of-Bounds Write in RASC Decoder decode_dlta()

published 2026-06-28 4 mo ago modified 2026-09-01 2 mo ago also EUVD-2026-39969 , GHSA-mjxr-6gqf-w78h , JLSEC-2026-1171

cvss
8.6
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 42%
public exploits
0
none known

Summary

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.

Patch / fix

  • julia FFMPEG_jll 9.0.0+0
  • julia FFMPEG_nogpl_jll 9.0.0+0
  • julia FFplay_jll 9.0.0+0
  • Red Hat Red Hat Enterprise Linux AI 3.0 for RHEL 9 0:6.1.6-3.el9ai
  • Red Hat Red Hat Enterprise Linux AI 3.2 for RHEL 9 0:6.1.6-3.el9ai
  • Red Hat Red Hat Enterprise Linux AI 3.3 for RHEL 9 0:6.1.6-3.el9ai
  • Red Hat Red Hat Enterprise Linux AI 3.5 for RHEL 9 0:6.1.6-1.el9ai
  • Red Hat Red Hat OpenShift AI 3.4 1786611800, 1787076481, 1787076778, 1787077779
  • ffmpeg Debian 14 7:9.0.2-1

debian advisories DEBIAN-CVE-2026-58049

  • 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-2026-58049

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 3.0 6.1.6-9.el9ai
  • ffmpeg-free-rhai enterprise linux ai 3.0 6.1.6-9.el9ai
  • libavutil-free-rhai enterprise linux ai 3.0 6.1.6-9.el9ai
  • libavcodec-free-rhai enterprise linux ai 3.0 6.1.6-9.el9ai
  • libswscale-free-rhai enterprise linux ai 3.0 6.1.6-9.el9ai
  • libavdevice-free-rhai enterprise linux ai 3.0 6.1.6-9.el9ai
  • libavfilter-free-rhai enterprise linux ai 3.0 6.1.6-9.el9ai
  • libavformat-free-rhai enterprise linux ai 3.0 6.1.6-9.el9ai

red hat advisories RHSA-2026:74089RHSA-2026:52832RHSA-2026:52833RHSA-2026:51180RHSA-2026:43711

  • ffmpeg-4 SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE High Performance Computing 15 SP4-LTSS +1 more 4.4.8-150400.3.75.1
  • ffmpeg-4 SLE Workstation Extension 15 SP7, SLE Module for Package Hub 15 SP7 4.4.8-150600.13.55.1

suse advisories SUSE-SU-2026:4150-1SUSE-SU-2026:4149-1

  • ffmpeg-7 openSUSE Leap 16.0 7.1.5-160000.1.1
  • ffmpeg-8 openSUSE Tumbleweed 8.1.2-3.1
  • ffmpeg-7 openSUSE Tumbleweed 7.1.5-2.1
  • ffmpeg-4 openSUSE Tumbleweed 4.4.8-4.1
  • ffmpeg-9 openSUSE Tumbleweed 9.0.1-2.1

opensuse advisories openSUSE-SU-2026:21877-1openSUSE-SU-2026:11682-1openSUSE-SU-2026:11665-1openSUSE-SU-2026:11563-1openSUSE-SU-2026:11545-1

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-2026-58049 updated cvss 7.6

FFmpeg: FFmpeg: Memory corruption via crafted RASC video stream

  • Red Hat AI Inference Server rhaii/vllm-cpu-rhel9, rhaii/vllm-tpu-rhel9, rhaii/vllm-cuda-rhel9, rhaii/vllm-rocm-rhel9, rhaiis/vllm-cpu-rhel9, rhaiis/vllm-tpu-rhel9, +5 more
    affected: workaround, no fix available, no fix planned “Will not fix”
  • Red Hat Enterprise Linux AI (RHEL AI) 3 rhelai3/bootc-gaudi-rhel9
    affected: workaround, no fix planned “Will not fix”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-vllm-gaudi-rhel9, rhai/base-image-rocm-6.4-rhel9, rhai/base-image-rocm-7.0-rhel9, rhai/base-image-rocm-7.1-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 3.3 rhaiis/vllm-cuda-rhel9 1789582776, rhaiis/vllm-rocm-rhel9 1789504371, rhaiis/vllm-spyre-rhel9 1789502493, rhaiis/model-opt-cuda-rhel9 1789508287
    fixed: vendor fix RHSA-2026:68696
  • Red Hat Enterprise Linux AI 3.0 for RHEL 9 ffmpeg 6.1.6-3.el9ai, ffmpeg 6.1.6-9.el9ai, ffmpeg-free-rhai 6.1.6-3.el9ai, ffmpeg-free-rhai 6.1.6-9.el9ai, libavutil-free-rhai 6.1.6-3.el9ai, libavutil-free-rhai 6.1.6-9.el9ai, +14 more
    fixed: vendor fix RHSA-2026:52832
  • Red Hat Enterprise Linux AI 3.2 for RHEL 9 ffmpeg 6.1.6-3.el9ai, ffmpeg-free-rhai 6.1.6-3.el9ai, libavutil-free-rhai 6.1.6-3.el9ai, libavcodec-free-rhai 6.1.6-3.el9ai, libswscale-free-rhai 6.1.6-3.el9ai, libavdevice-free-rhai 6.1.6-3.el9ai, +4 more
    fixed: vendor fix RHSA-2026:52833
  • Red Hat Enterprise Linux AI 3.3 rhelai3/bootc-cuda-rhel9 1790866732, rhelai3/bootc-rocm-rhel9 1790791893, rhelai3/bootc-aws-cuda-rhel9 1790936334, rhelai3/bootc-gcp-cuda-rhel9 1790936334, rhelai3/disk-image-cuda-rhel9 1790954179, rhelai3/bootc-azure-cuda-rhel9 1790936351, +1 more
    fixed: vendor fix RHSA-2026:76041
show 7 more
  • Red Hat Enterprise Linux AI 3.3 for RHEL 9 ffmpeg 6.1.6-3.el9ai, ffmpeg-free-rhai 6.1.6-3.el9ai, libavutil-free-rhai 6.1.6-3.el9ai, libavcodec-free-rhai 6.1.6-3.el9ai, libswscale-free-rhai 6.1.6-3.el9ai, libavdevice-free-rhai 6.1.6-3.el9ai, +4 more
    fixed: vendor fix RHSA-2026:51180
  • Red Hat Enterprise Linux AI 3.5 for RHEL 9 ffmpeg 6.1.6-1.el9ai, ffmpeg-free-rhai 6.1.6-1.el9ai, libavutil-free-rhai 6.1.6-1.el9ai, libavcodec-free-rhai 6.1.6-1.el9ai, libswscale-free-rhai 6.1.6-1.el9ai, libavdevice-free-rhai 6.1.6-1.el9ai, +4 more
    fixed: vendor fix RHSA-2026:43711
  • Red Hat OpenShift AI 3.2 rhai/base-image-cpu-rhel9 1790703590, rhai/base-image-cpu-rhel9 1791232203, rhai/base-image-tpu-rhel9 1790703497, rhai/base-image-tpu-rhel9 1791231896, rhai/base-image-cuda-rhel9 1790703586, rhai/base-image-cuda-rhel9 1791232024, +6 more
    fixed: vendor fix RHSA-2026:74460
  • Red Hat OpenShift AI 3.4 rhoai/odh-mlserver-rhel9 1786611800, rhoai/odh-th06-cpu-torch210-py312-rhel9 1787076778, rhoai/odh-th06-rocm64-torch291-py312-rhel9 1787076481, rhoai/odh-th06-cuda130-torch210-py312-rhel9 1787077779, rhoai/odh-trustyai-garak-lls-provider-dsp-rhel9 1791785804
    fixed: vendor fix RHSA-2026:60520
  • 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-spyre-rhel9 1790703630, rhai/base-image-neuron-rhel9 1790703557, rhai/base-image-cuda-12.9-rhel9 1790703706, +4 more
    fixed: vendor fix RHSA-2026:75652
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-automl-rhel9, rhoai/odh-autorag-rhel9, rhoai/odh-llm-d-kv-cache-rhel9, rhoai/odh-spark-operator-rhel9, rhoai/odh-llama-stack-core-rhel9, rhoai/odh-kserve-autogluon-server-rhel9, +8 more
    not affected: vulnerable code not in execute path
  • Red Hat OpenShift AI 3.4 rhoai/odh-cli-rhel9 1787330837, rhoai/odh-cli-rhel9 1791509689, rhoai/rhai-cli-rhel9 1787330837, rhoai/rhai-cli-rhel9 1791509689, rhoai/odh-automl-rhel9 1786612415, rhoai/odh-automl-rhel9 1791535789, +201 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
yes
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/bikini/exploitarium/tree/main/ffmpeg-rasc-dlta-calc-poc referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
CNA 4.0 8.8 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
CISA ADP 3.1 7.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
CNA 4.0 8.8 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
CNA 3.1 7.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
OSV 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/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
  • Red Hat Red Hat Enterprise Linux AI 3.0 for RHEL 9
  • Red Hat Red Hat Enterprise Linux AI 3.2 for RHEL 9
  • Red Hat Red Hat Enterprise Linux AI 3.3 for RHEL 9
  • Red Hat Red Hat Enterprise Linux AI 3.5 for RHEL 9
  • Red Hat Red Hat OpenShift AI 3.4
  • Red Hat Red Hat AI Inference Server
  • 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.