FFmpeg DASH demuxer libavformat/dashdec.c out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability was found in FFmpeg. It has been rated as critical. This affects an unknown function of the file libavformat/dashdec.c of the component DASH demuxer. Performing a manipulation results in out-of-bounds. This vulnerability is known as CVE-2026-75146. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in FFmpeg (version unknown). It has been classified as critical. This affects an unknown function of the file libavformat/dashdec.c of the component DASH demuxer. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

FFmpeg before commit 65b0dab contains an out-of-bounds read in the DASH demuxer (libavformat/dashdec.c). When a live DASH manifest is refreshed with a startNumber that is lower than the previous value, the current sequence number is driven negative. The fragment retrieval function checked only the upper bound before indexing the fragments array, allowing a negative index to be used and causing an out-of-bounds read. A malicious or misconfigured DASH server can trigger this by serving a live manifest with a decreasing startNumber across a manifest refresh.

The advisory is shared at code.ffmpeg.org. This vulnerability is uniquely identified as CVE-2026-75146 since 08/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 338206 (Linux Distros Unpatched Vulnerability : CVE-2026-75146), which helps to determine the existence of the flaw in a target environment.

Applying the patch 65b0dab903e5975e036b30ecc58f5935d4f151e0 is able to eliminate this problem.

The vulnerability is also documented in the vulnerability database at Tenable (338206). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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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: 7.2
VulDB Meta Temp Score: 7.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.1
CNA Vector (VulnCheck): 🔒

CVSSv2info

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

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 338206
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-75146

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: 65b0dab903e5975e036b30ecc58f5935d4f151e0

Timelineinfo

08/17/2026 CVE reserved
08/19/2026 +2 days Advisory disclosed
08/19/2026 +0 days VulDB entry created
08/20/2026 +1 days VulDB entry last update

Sourcesinfo

Product: ffmpeg.org

Advisory: code.ffmpeg.org
Status: Confirmed

CVE: CVE-2026-75146 (🔒)
GCVE (CVE): GCVE-0-2026-75146
GCVE (VulDB): GCVE-100-393225

Entryinfo

Created: 08/19/2026 18:50
Updated: 08/20/2026 12:39
Changes: 08/19/2026 18:50 (75), 08/20/2026 12:39 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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