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CVE-2026-75145— FFmpeg Integer Narrowing Conversion OOB Memory Access in AV1 RTP Packetizer

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组织开源的一个多媒体处理框架。 FFmpeg b4c199c之前版本存在数字错误漏洞，该漏洞源于AV1 RTP打包器中错误的整数窄化转换，可能导致越界内存访问。

CVSS 5.8 · Medium EPSS 0.12% · P2

Affected Version Matrix 1

VendorProduct Version RangeStatus
FFmpeg FFmpeg < b4c199c5906ff53368926c2a5839881f41957e7f affected
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I. Basic Information for CVE-2026-75145

Vulnerability Information
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Vulnerability Title
FFmpeg Integer Narrowing Conversion OOB Memory Access in AV1 RTP Packetizer
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg before commit b4c199c contains an incorrect integer narrowing conversion in the AV1 RTP packetizer (libavformat/rtpenc_av1.c). The OBU size is cast to long before comparison against the remaining frame size. On targets where long is 32 bits, including 64-bit Windows, sufficiently large OBU size values are sign-flipped by the narrowing cast, producing a negative value that passes the payload size check. This allows an oversized OBU to bypass the safety bound on affected platforms, leading to out-of-bounds memory access when the oversized value is subsequently used as a copy length.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
数值类型间的不正确转换
Source: CVE Program / CVE List V5
Vulnerability Title
FFmpeg 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FFmpeg是FFmpeg组织开源的一个多媒体处理框架。 FFmpeg b4c199c之前版本存在数字错误漏洞，该漏洞源于AV1 RTP打包器中错误的整数窄化转换，可能导致越界内存访问。
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 ~ b4c199c5906ff53368926c2a5839881f41957e7f -

II. Public POCs for CVE-2026-75145

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III. Intelligence Information for CVE-2026-75145

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Patches & Fixes for CVE-2026-75145 (2)

Vendor Advisories for CVE-2026-75145 (1)

Same Patch Batch · FFmpeg · 2026-08-19 · 7 CVEs total

CVE-2026-75143 9.8 CRITICAL FFmpeg Heap Buffer Overflow via RIST Protocol Reader
CVE-2026-75146 8.1 HIGH FFmpeg Out-of-Bounds Read in DASH Demuxer via dashdec.c
CVE-2026-75142 7.8 HIGH FFmpeg Stack Buffer Overflow in MPEG-PS Muxer via mpegenc.c
CVE-2026-75141 7.8 HIGH FFmpeg Heap Buffer Overflow in hvcC Box Writer via HEVC Muxing
CVE-2026-75144 7.8 HIGH FFmpeg Heap Buffer Overflow in VC-2/Dirac RTP Packetizer
CVE-2026-75147 7.1 HIGH FFmpeg Out-of-Bounds Read in AV1 RTP Packetizer via rtpenc_av1.c

IV. Related Vulnerabilities

Same product: FFmpeg
Same vendor: FFmpeg
Same weakness: CWE-681

V. Comments for CVE-2026-75145

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