EUVD-2026-67320
GHSA-gpjg-x49v-595v
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network vector applies when FFmpeg auto-processes untrusted media server-side; no authentication or interaction required; impact is availability-only via crash.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
A heap overflow in the ff_sws_alphablendaway function (libswscale/alphablend.c) of FFmpeg git-master commit 722a217 allows attackers to cause a Denial of Service (DoS) via a crafted input.
AnalysisAI
Heap-based buffer overflow in FFmpeg's libswscale library enables unauthenticated remote attackers to crash media-processing applications via a crafted input file. The vulnerable function ff_sws_alphablendaway, invoked during alpha channel compositing in git-master commit 722a217, mishandles attacker-controlled input and corrupts heap memory, producing a Denial of Service. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Triggering the vulnerability requires that the target application: (1) uses FFmpeg git-master at or near commit 722a217, (2) invokes the libswscale alpha blending code path - meaning it processes media input that contains an alpha channel component, and (3) accepts or fetches that media from an attacker-controlled source without prior validation. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) reflects a worst-case scenario where a server-side application automatically decodes untrusted media submitted by unauthenticated users - common in media transcoding services, video ingestion pipelines, and streaming platforms. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patched version is identified at time of analysis; monitor the FFmpeg trac ticket at https://trac.ffmpeg.org/ticket/11692 and official FFmpeg release announcements for an upstream fix. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit all systems running FFmpeg to identify media processing applications and their version numbers to determine exposure to this libswscale vulnerability. …
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Threat intelligence, references, and detailed analysis are available after sign-in.
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Denial Of Service
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External POC / Exploit Code
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