FFmpeg AV1 RTP Packetizer libavformat/rtpenc_av1.c numeric truncation error

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.43

Summaryinfo

A vulnerability labeled as problematic has been found in FFmpeg. Affected by this vulnerability is an unknown functionality of the file libavformat/rtpenc_av1.c of the component AV1 RTP Packetizer. The manipulation results in numeric truncation error. This vulnerability was named CVE-2026-75145. The attack needs to be approached locally. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic has been found in FFmpeg (the affected version unknown). Affected is an unknown part of the file libavformat/rtpenc_av1.c of the component AV1 RTP Packetizer. The manipulation with an unknown input leads to a numeric truncation error vulnerability. CWE is classifying the issue as CWE-197. Truncation errors occur when a primitive is cast to a primitive of a smaller size and data is lost in the conversion. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at code.ffmpeg.org. This vulnerability is traded as CVE-2026-75145 since 08/17/2026. The exploitability is told to be easy. The attack needs to be approached locally. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Applying the patch b4c199c5906ff53368926c2a5839881f41957e7f is able to eliminate this problem.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 4.8
VulDB Temp Score: 4.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.8
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Numeric truncation error
CWE: CWE-197 / CWE-189
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: b4c199c5906ff53368926c2a5839881f41957e7f

Timelineinfo

08/17/2026 CVE reserved
08/19/2026 +2 days Advisory disclosed
08/19/2026 +0 days VulDB entry created
08/19/2026 +0 days VulDB entry last update

Sourcesinfo

Product: ffmpeg.org

Advisory: code.ffmpeg.org
Status: Confirmed

CVE: CVE-2026-75145 (🔒)
GCVE (CVE): GCVE-0-2026-75145
GCVE (VulDB): GCVE-100-393228

Entryinfo

Created: 08/19/2026 18:52
Changes: 08/19/2026 18:52 (75)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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