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CVE-2026-58049— FFmpeg - Out-of-Bounds Write in RASC Decoder decode_dlta()

Quick assessment

Affected
FFmpeg FFmpeg
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FFmpeg是FFmpeg组织开源的一套可录制、转换以及流化音视频的完整解决方案。 FFmpeg存在缓冲区错误漏洞，该漏洞源于RASC视频解码器（libavcodec/rasc.c中的decode_dlta）在NEXT_LINE行边界检查之前执行32位读写操作，并以像素而非字节单位验证DLTA区域，可能导致特制媒体流触发越界堆写入和相邻越界读取，从而导致内存损坏。

CVSS 8.6 · High EPSS 0.50% · P41

Affected Version Matrix 1

VendorProduct Version RangeStatus
FFmpeg FFmpeg ≤ bcd2c69e087a09b07cf45c6bd2428ee1ccb2925c affected
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I. Basic Information for CVE-2026-58049

Vulnerability Information
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Vulnerability Title
FFmpeg - Out-of-Bounds Write in RASC Decoder decode_dlta()
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
FFmpeg 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FFmpeg是FFmpeg组织开源的一套可录制、转换以及流化音视频的完整解决方案。 FFmpeg存在缓冲区错误漏洞，该漏洞源于RASC视频解码器（libavcodec/rasc.c中的decode_dlta）在NEXT_LINE行边界检查之前执行32位读写操作，并以像素而非字节单位验证DLTA区域，可能导致特制媒体流触发越界堆写入和相邻越界读取，从而导致内存损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FFmpeg FFmpeg 0 ~ bcd2c69e087a09b07cf45c6bd2428ee1ccb2925c -

II. Public POCs for CVE-2026-58049

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III. Intelligence Information for CVE-2026-58049

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Vendor Advisories for CVE-2026-58049 (1)

Proof of Concept for CVE-2026-58049 (1)

IV. Related Vulnerabilities

Same product: FFmpeg
Same vendor: FFmpeg
Same weakness: CWE-787

V. Comments for CVE-2026-58049

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