FFmpeg up to 9.0.2 MJPEG Decoder libavcodec/mjpegdec.c ff_mjpeg_decode_sof memory leak

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.22+

Summaryinfo

A vulnerability, which was classified as critical, was found in FFmpeg up to 9.0.2. This affects the function ff_mjpeg_decode_sof of the file libavcodec/mjpegdec.c of the component MJPEG Decoder. Such manipulation leads to memory leak. This vulnerability is listed as CVE-2026-125245. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in FFmpeg up to 9.0.2. It has been rated as critical. Affected by this issue is the function ff_mjpeg_decode_sof of the file libavcodec/mjpegdec.c of the component MJPEG Decoder. The manipulation with an unknown input leads to a memory leak vulnerability. Using CWE to declare the problem leads to CWE-401. The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse. Impacted is confidentiality, integrity, and availability. CVE summarizes:

FFmpeg through 9.0.2 contains a memory leak vulnerability in ff_mjpeg_decode_sof() in libavcodec/mjpegdec.c, which overwrites the hwaccel_picture_private pointer without freeing it. Attackers can supply crafted MJPEG streams with repeated SOF markers or failing frames to leak hwaccel private data and hardware buffers under VAAPI or NVDEC decoding.

The advisory is available at code.ffmpeg.org. This vulnerability is handled as CVE-2026-125245 since 11/09/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

Name

Version

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: 5.5
VulDB Meta Temp Score: 5.5

VulDB Base Score: 6.3
VulDB Temp Score: 6.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 4.7
CNA Vector (VulnCheck): 🔒

CVSSv2info

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

Exploitinginfo

Class: Memory leak
CWE: CWE-401 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Yes

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

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

11/09/2026 Advisory disclosed
11/09/2026 +0 days CVE reserved
11/09/2026 +0 days VulDB entry created
11/09/2026 +0 days VulDB entry last update

Sourcesinfo

Product: ffmpeg.org

Advisory: code.ffmpeg.org
Status: Not defined

CNA: VulnCheck
CVE: CVE-2026-125245 (🔒)

GCVE (CVE): GCVE-0-2026-125245
GCVE (VulDB): GCVE-100-433358

Entryinfo

Created: 11/09/2026 20:55
Changes: 11/09/2026 20:55 (75)
Complete: 🔍
Cache ID: 216::103

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