Read the docs
TI-2026-49341 Aliases CVE-2026-70631GHSA-5f73-3r3j-p8mr

FFmpeg 0.5 < 9.0 Uninitialized Heap Memory Read in TIFF Decoder

Priority LOW 29CWE-908Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 2 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-908 and the CVSS impact.

Summary

FFmpeg versions from 0.5 up to, but not including, 9.0 contain an uninitialized heap memory disclosure vulnerability in the native TIFF decoder in libavcodec/tiff.c. An attacker who can cause FFmpeg to decode a crafted TIFF file can supply a valid Deflate-compressed strip that terminates successfully after producing fewer bytes than the declared strip requires. The tiff_unpack_zlib() function allocates a heap buffer sized for the full declared strip but copies all declared rows via memcpy() regardless of how many bytes zlib actually decompressed, causing unwritten bytes that can contain stale data from prior heap allocations to be incorporated into decoded image output and potentially exposing sensitive data in persistent services.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00178 7th percentileScored 2026-11-07
Fix Partial FFmpeg (FFmpeg): 9.0Red Hat: 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
FFmpegFFmpeg0.5 to before 9.09.0Patch availableCNA
  • FFmpeg VendorFFmpeg Affected 0.5 to before 9.0 Fixed in 9.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*0.5 to before 9VulnerableFFmpeg
  • cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:* Versions 0.5 to before 9 Vulnerable ·FFmpeg

Remediation

  • Fix · CNA FFmpeg (FFmpeg) Fixed in 9.0

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    FFmpeg 9.0

    5 records Highest priority Priority LOW 5 LOW

    Other records, highest priority first

    • TI-2026-49342 FFmpeg 4.4 < 9.0 Heap Out-of-Bounds Write in CFHD Decoder via AVI DemuxingPriority LOW 38
    • TI-2026-49338 FFmpeg 0.5 < 9.0 DVB Subtitle Parser Heap Buffer Overflow via WTV FilePriority LOW 38
    • TI-2026-49340 FFmpeg 3.0 < 9.0 Uninitialized Heap Memory Read in Screenpresso DecoderPriority LOW 29
    Show all 5 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux AI (RHEL AI) 3AffectedNo fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-70631
  2. 2026-10-03 Alias added: GHSA-5f73-3r3j-p8mr

References

Patch 4

  • TI-2025-19015 FFmpeg git-master before commit d5873b was discovered to contain a memory leak in the component libavutil/iamf.c. CVSS 3.1HIGH 8.8
  • TI-2024-21238 FFmpeg 7.0 contains a heap-buffer-overflow at libavfilter/vf_tiltandshift.c:189:5 in copy_column. CVSS 3.1HIGH 8.4
  • TI-2023-06050 Ffmpeg: null pointer dereference in ffmpeg hls parsing CVSS 3.1HIGH 7.5
  • TI-2023-28420 Buffer Overflow vulnerability in Ffmpeg v.N113007-g8d24a28d06 allows a local attacker to… CVSS 3.1HIGH 8.0
  • TI-2023-27357 FFmpeg v.n6.1-3-g466799d4f5 allows a heap-based buffer overflow via the… CVSS 3.1HIGH 8.0
  • TI-2023-27044 Buffer Overflow vulnerability in FFmpeg version n6.1-3-g466799d4f5, allows a local… CVSS 3.1HIGH 8.0
See all 514 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences