CVE-2026-75145 (GCVE-0-2026-75145)

Vulnerability from cvelistv5 – Published: 2026-08-19 16:27 – Updated: 2026-10-27 10:14 X_Open Source
VLAI
Title
FFmpeg Integer Narrowing Conversion OOB Memory Access in AV1 RTP Packetizer
Summary
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.
Severity
5.8 (Medium)
CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
5.8 (Medium)
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-21 19:52 UTC
CWE
  • CWE-681 - Incorrect Conversion between Numeric Types
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 7427 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
FFmpeg FFmpeg Affected: 0 , < b4c199c5906ff53368926c2a5839881f41957e7f (git)
    cpe:2.3:a:ffmpeg:ffmpeg:-:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-04 00:00
Credits
Joshua Rogers (AISLE Research)
Show details on NVD website
To clipboard 

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.