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Fencer Intel
medium 6.9

CVE-2026-96611 json

FFmpeg before 9.0 has a signed integer overflow in libavformat/mov.c.

published last mo. modified 27d ago also EUVD-2026-85311

cvss
6.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits
0
none known

Summary

FFmpeg before 9.0 has a signed integer overflow in libavformat/mov.c. In mov_read_ispe(), uint32_t width/height values from a crafted HEIF ispe box are stored into signed int fields without bounds checking, allowing values exceeding INT_MAX to become negative. In read_image_grid(), accumulating these values causes signed integer overflow (undefined behavior per C17 section 6.5), which on x86 wraps to a small positive value, bypassing downstream validity checks.

Patch / fix

  • FFmpeg FFmpeg 9.0
  • ffmpeg Debian 13 7:7.1.5-0+deb13u1
  • ffmpeg Debian 14 7:8.1.2-1

debian advisories DEBIAN-CVE-2026-96611

  • ffmpeg-8 openSUSE Tumbleweed 8.1.3-4.1
  • ffmpeg-9 openSUSE Tumbleweed 9.0.2-5.1

opensuse advisories openSUSE-SU-2026:12416-1openSUSE-SU-2026:12417-1

Is CVE-2026-96611 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2026-96611 updated cvss 6.5

ffmpeg: FFmpeg: Data corruption and information disclosure via signed integer overflow in HEIF processing

  • Red Hat Enterprise Linux AI (RHEL AI) 3 ffmpeg 6.1.6-9.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: no fix available “Fix deferred”

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
last mo.

Exploit prediction

0.11% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 6.9 CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • FFmpeg FFmpeg

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Intel 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.