HIGHVulnerability
Verified
Global

NVD HIGH: CVE-2026-58049 — FFmpeg's RASC video decoder (decode_dlta in libavcodec/rasc.c) performs 32-bit r...

·Source: NIST NVD

Updated:

Executive 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 ou

Analysis

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. CVSS Score: 8.6. Published: 2026-06-28T02:16:30.477.

Indicators of Compromise (1)

CVE (1)
CVE-2026-58049
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on Jun 28, 2026. Verified by: NIST.

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