FFmpeg versions from 3.0 up to, but not including, 9.0 contain an uninitialized heap memory read vulnerability in the native RSCC decoder (libavcodec/rscc.c) that allows attackers to disclose heap memory contents by supplying a crafted video file with a compressed tile that decompresses fewer bytes than the declared tile geometry requires. When rscc_decode_frame() calls av_image_copy_plane() without validating the decompressed byte count against the tile dimensions, the unwritten suffix of the persistent intermediate buffer ctx->inflated_buf is copied into the decoded frame, potentially exposing data from prior heap allocations or previous decoded frames in persistent decoding services.
History

Fri, 14 Aug 2026 17:15:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*

Fri, 07 Aug 2026 17:30:00 +0000

Type Values Removed Values Added
References
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 07 Aug 2026 01:15:00 +0000

Type Values Removed Values Added
First Time appeared Ffmpeg
Ffmpeg ffmpeg
Vendors & Products Ffmpeg
Ffmpeg ffmpeg

Thu, 06 Aug 2026 22:15:00 +0000

Type Values Removed Values Added
Description FFmpeg versions from 3.0 up to, but not including, 9.0 contain an uninitialized heap memory read vulnerability in the native RSCC decoder (libavcodec/rscc.c) that allows attackers to disclose heap memory contents by supplying a crafted video file with a compressed tile that decompresses fewer bytes than the declared tile geometry requires. When rscc_decode_frame() calls av_image_copy_plane() without validating the decompressed byte count against the tile dimensions, the unwritten suffix of the persistent intermediate buffer ctx->inflated_buf is copied into the decoded frame, potentially exposing data from prior heap allocations or previous decoded frames in persistent decoding services.
Title FFmpeg 3.0 < 9.0 Uninitialized Heap Memory Read in RSCC Decoder
Weaknesses CWE-908
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 6.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-14T16:51:32.132Z

Reserved: 2026-08-04T20:17:18.297Z

Link: CVE-2026-70629

cve-icon Vulnrichment

Updated: 2026-08-07T16:15:38.786Z

cve-icon NVD

Status : Received

Published: 2026-08-06T22:18:27.123

Modified: 2026-08-07T18:17:21.927

Link: CVE-2026-70629

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-07T01:00:05Z