CVE-2026-75147

FFmpeg before commit 983dae9 contains an out-of-bounds read in the AV1 RTP packetizer (libavformat/rtpenc_av1.c). The keyframe detection loop that searches for a sequence header OBU advanced its pointer and remaining-size counter by the encoded header length plus the OBU payload size without first bounding the OBU size against the remaining data. A crafted OBU size causes the remaining-size counter to wrap to a positive value, causing the next loop iteration to dereference a pointer beyond the end of the packet buffer. A crafted AV1 input packet muxed to RTP triggers the out-of-bounds read.

CVSS v3 7.1 HIGH

7.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.2

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/983dae9c19f46c87d597598c0fd2f2fcee0ad2f8
https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24096
https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-read-in-av1-rtp-packetizer-via-rtpenc-av1-c

Configurations

No configuration.

History

26 Oct 2026, 11:10

Type	Values Removed	Values Added
Summary		(es) FFmpeg antes del commit 983dae9 contiene una lectura fuera de límites en el empaquetador RTP de AV1 (libavformat/rtpenc_av1.c). El bucle de detección de fotogramas clave que busca un OBU de encabezado de secuencia avanzó su puntero y el contador de tamaño restante por la longitud del encabezado codificado más el tamaño de la carga útil del OBU sin primero acotar el tamaño del OBU con respecto a los datos restantes. Un tamaño de OBU manipulado hace que el contador de tamaño restante se ajuste a un valor positivo, haciendo que la siguiente iteración del bucle desreferencie un puntero más allá del final del búfer del paquete. Un paquete de entrada AV1 manipulado multiplexado a RTP desencadena la lectura fuera de límites.

Information

Published : 2026-08-19 17:21

Updated : 2026-10-26 11:10

NVD link : CVE-2026-75147

Mitre link : CVE-2026-75147

CVE.ORG link : CVE-2026-75147

JSON object : View

Products Affected

No product.

CWE

CWE-125

Out-of-bounds Read

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