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FFmpeg CVE-2026-65706

| EUVDEUVD-2026-48373 HIGH
Out-of-bounds Write (CWE-787)
2026-07-23 VulnCheck GHSA-g9rh-4g64-7qxg
8.5
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.5 HIGH
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.8 HIGH

Local processing of a crafted frame with passive user interaction (AV:L/UI:R), no privileges needed (PR:N), and heap corruption yielding potential code execution justifies high C/I/A with unchanged scope.

3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
6.1 MEDIUM
AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Red Hat
5.5 MEDIUM
qualitative

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

2
Analysis Generated
Jul 23, 2026 - 19:47 vuln.today
CVE Published
Jul 23, 2026 - 19:05 cve.org
HIGH 8.5

DescriptionCVE.org

FFmpeg versions 3.0 through 8.1.2 contain an out-of-bounds write vulnerability in the vf_swaprect video filter that allows attackers to corrupt heap memory by supplying a crafted NV12 video frame with odd width dimensions. The filter_frame() function reuses a temporary row buffer sized for plane 0's single-byte pixel step across all planes, causing an 18-byte memcpy into a 17-byte heap allocation when processing the two-byte-per-sample interleaved chroma plane of a 17x16 NV12 frame, resulting in heap corruption and process crash with potential for code execution.

AnalysisAI

Heap out-of-bounds write in FFmpeg's vf_swaprect video filter (versions 3.0 through 8.1.2) lets an attacker corrupt heap memory by getting the library to process a crafted NV12 video frame with odd width, causing an 18-byte copy into a 17-byte buffer. Successful exploitation causes at minimum a process crash and potentially arbitrary code execution in the context of the application embedding FFmpeg. Reported by VulnCheck with an upstream fix committed; there is no public exploit identified at time of analysis and it is not on CISA KEV.

Technical ContextAI

FFmpeg is one of the most widely embedded multimedia frameworks, used by media players, transcoding pipelines, browsers, and server-side video processors. The bug lives in the swaprect video filter (libavfilter/vf_swaprect.c), which swaps two rectangular regions of a frame by copying rows through a temporary buffer. The filter_frame() function sizes that temporary row buffer using plane 0's pixel step (one byte per sample), then reuses it across all planes. NV12 is a semi-planar YUV format where plane 0 is single-byte luma but plane 1 is interleaved chroma at two bytes per sample. For a 17x16 NV12 frame the code copies 18 bytes of interleaved chroma into the 17-byte allocation, a classic CWE-787 out-of-bounds write driven by mismatched per-plane pixel-step assumptions.

RemediationAI

Upstream fix available (PR/commit); released patched version not independently confirmed - apply the fix in FFmpeg commit a7e38b617b32f996beaa371bbf04b39907d7a527 (https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/a7e38b617b32f996beaa371bbf04b39907d7a527), tracked in PR https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23779, and rebuild or update to a release that incorporates it once tagged. Until a patched build is deployed, remove the swaprect filter from any filtergraphs and reject or sanitize untrusted NV12 input; because the trigger is odd-width NV12 frames, forcing pixel-format conversion or even-dimension normalization (e.g. scale/pad to even width) before swaprect avoids the miscalculation, at the cost of an extra processing step and possible minor quality/alignment changes. If swaprect is not used in your pipeline, the practical exposure is limited to code paths that invoke it, so auditing filtergraph definitions and disabling user-controllable filter selection is an effective compensating control.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Affected

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CVE-2026-65706 vulnerability details – vuln.today

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