FFmpeg up to 9.0.2 V4L2 Buffer v4l2_buffers.c v4l2_buffer_swframe_to_buf out-of-bounds write

CVSS Meta Temp Score
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CTI Interest Score
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5.9$0-$5k0.00+

Summaryinfo

A vulnerability, which was classified as problematic, has been found in FFmpeg up to 9.0.2. This vulnerability affects the function v4l2_buffer_swframe_to_buf of the file libavcodec/v4l2_buffers.c of the component V4L2 Buffer Handler. This manipulation causes out-of-bounds write. This vulnerability is registered as CVE-2026-125208. The attack needs to be launched locally. No exploit is available.

Detailsinfo

A vulnerability classified as problematic was found in FFmpeg up to 9.0.2. Affected by this vulnerability is the function v4l2_buffer_swframe_to_buf of the file libavcodec/v4l2_buffers.c of the component V4L2 Buffer Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

FFmpeg through 9.0.2 contains an out-of-bounds write vulnerability in v4l2_buffer_swframe_to_buf() in libavcodec/v4l2_buffers.c because cumulative plane offsets are not checked against the V4L2 buffer length. Attackers can supply crafted video whose dimensions or padding cause unsigned wraparound in v4l2_bufref_to_buf(), making memcpy() write past the mmaped driver buffer during V4L2 M2M encoding.

It is possible to read the advisory at code.ffmpeg.org. This vulnerability is known as CVE-2026-125208 since 11/09/2026. The exploitation appears to be easy. Attacking locally is a requirement. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/09/2026).

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

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Version

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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: 5.9
VulDB Meta Temp Score: 5.9

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

CNA Base Score: 7.0
CNA Vector (VulnCheck): 🔒

CVSSv2info

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

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
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: 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-2026-125208 (🔒)

GCVE (CVE): GCVE-0-2026-125208
GCVE (VulDB): GCVE-100-433315

Entryinfo

Created: 11/09/2026 20:41
Changes: 11/09/2026 20:41 (75)
Complete: 🔍
Cache ID: 216::103

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