Ffmpeg EUVD-2026-48370

| CVE-2026-65703 HIGH

Out-of-bounds Write (CWE-787)

2026-07-23 VulnCheck

GHSA-x3xw-4qcq-c6mr

RCE Buffer Overflow Memory Corruption Ffmpeg

8.5

CVSS 4.0 · Vendor: VulnCheck

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Vulnerability Assessment

Weakness

CWE

ASVS 5.0

V15 - Secure Coding and Architecture Bounds checking, write limits

MITRE ATT&CK

2 techniques across 2 tactics: Execution, Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 23, 2026

Heap out-of-bounds write in FFmpeg's TDSC video decoder (versions 2.7 through 8.1.2) lets a remote attacker corrupt heap memory and potentially achieve code execution when a victim opens or transcodes a crafted AVI file whose frame dimensions change across TDSF frames. The flaw carries a CVSS 4.0 base score of 8.5 with high confidentiality, integrity, and availability impact, and requires the target to process the malicious file (UI:P). No public exploit identified at time of analysis, and it is not listed in CISA KEV; it was reported by VulnCheck.

Affected VersionsENISA

FFmpeg 2.7 ≤8.1.2

FFmpeg patch: fd3ee52fab34d98a95b787d0b5ff45685766200c

Affected Packages

euvd ffmpeg no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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Exploit and PoC references, threat intelligence from 22 sources

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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

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

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector

Local

Attack Complexity

Low

Attack Requirements

None

Privileges Required

None

User Interaction

Passive

Vulnerable system: Confidentiality

High

Vulnerable system: Integrity

High

Vulnerable system: Availability

High

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

DescriptionCVE.org

FFmpeg versions 2.7 through 8.1.2 contain an out-of-bounds write vulnerability in the TDSC video decoder that allows remote attackers to cause heap corruption by supplying a crafted AVI file that changes frame dimensions across TDSF frames. The tdsc_parse_tdsf() function fails to unreference the existing reference frame before calling av_frame_get_buffer(), causing tdsc_blit() and tdsc_yuv2rgb() to write attacker-controlled pixel data beyond the end of the undersized reference frame buffer, resulting in a process crash and potential code execution.

Executive ViewAI

Why It Matters

FFmpeg TDSC decoder vulnerability (CVE-2026-65703) affects versions 2.7-8.1.2 and could enable remote code execution when processing malicious video files. Organizations relying on FFmpeg for video transcoding or media processing face potential compromise of system confidentiality, integrity, and availability, requiring immediate patching.

Recommended Action

Within 24 hours, identify all systems running FFmpeg versions 2.7 through 8.1.2, particularly those handling untrusted video files or performing automated transcoding. Within 7 days, apply the vendor-released patch to all affected FFmpeg installations and validate deployment in staging environments before production rollout. Within 30 days, audit video processing workflows to confirm patch application across all systems and review logs from the past 90 days for any suspicious media processing activity that may indicate prior exploitation attempts.

Business Impact: High

Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score

0.2%

Top 89% exploitable

Social Media

1

Sightings

Data Quality

8 sources

Confidence: High

EUVD

CVE.org

EPSS

Vulnrichment Vendor CIRCL

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.2%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision

Scheduled

Exploitation

None

System Exposure· derived

Small

Automatable

No

Human Impact

High

Technical Impact

Total

Priority Score

42

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +42

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Memory Corruption HIGH

Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.

More in Ffmpeg

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FFmpeg 2.x allows remote attackers to conduct cross-origin attacks and read arbitrary files by using the concat protocol

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CVE-2016-1898 MEDIUM This Month POC

FFmpeg 2.x allows remote attackers to conduct cross-origin attacks and read arbitrary files by using the subfile protoco

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The av_reallocp_array function in libavutil/mem.c in FFmpeg before 2.0.1 has an unspecified impact and remote vectors re

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Memory corruption in FFmpeg before 8.1 allows an attacker who can supply a crafted H.264/HEVC media file to corrupt heap

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Integer Overflow vulnerability in function filter_prewitt in libavfilter/vf_convolution.c in Ffmpeg 4.2.1, allows attack

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Integer Overflow vulnerability in function filter16_sobel in libavfilter/vf_convolution.c in Ffmpeg 4.2.1, allows attack

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Integer Overflow vulnerability in function filter16_roberts in libavfilter/vf_convolution.c in Ffmpeg 4.2.1, allows atta

Same weakness CWE-787 – Out-of-bounds Write

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CVE-2015-3113 CRITICAL POC

CVE-2011-2462 CRITICAL POC

CVE-2012-1889 HIGH POC

CVE-2010-3333 HIGH POC

CVE-2014-1761 HIGH POC

CVE-2009-3129 HIGH POC

CVE-2021-1732 HIGH POC

CVE-2013-3346 CRITICAL POC

Same technique RCE

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CVE-2021-44228 CRITICAL POC

CVE-2017-7269 CRITICAL POC

CVE-2022-47966 CRITICAL POC

CVE-2012-4681 CRITICAL POC

CVE-2023-3519 CRITICAL POC

CVE-2015-5119 CRITICAL POC

CVE-2016-4117 CRITICAL POC

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

References

Advisories & patches

PATCH https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/fd3ee52fab34d98a95b787d0b5ff45685766200c ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-65703 ADVISORY https://ubuntu.com/security/notices/USN-8716-1 ADVISORY https://vuldb.com/vuln/382783 REF https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23773 REF https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-write-in-tdsc-video-decoder

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