Ffmpeg EUVD-2026-48738

| CVE-2026-66036 HIGH

Heap-based Buffer Overflow (CWE-122)

2026-07-24 VulnCheck

Buffer Overflow Heap Overflow Ffmpeg

7.7

CVSS 4.0 · Vendor: VulnCheck

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Vulnerability Assessment

Weakness

CWE

ASVS 5.0

V15 - Secure Coding and Architecture Heap buffer bounds checking

MITRE ATT&CK

1 technique across 1 tactic: Execution

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 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 27, 2026

Heap-based buffer overflow in the vf_hqdn3d denoising filter of FFmpeg versions up to 8.1.2 allows remote attackers to execute arbitrary code by tricking a user into processing a crafted video with filter graph reinitialization explicitly disabled (-reinit_filter 0). Exploitation requires the vulnerable filter to be applied to input where frame width increases after the initial frame, causing an undersized buffer allocation and subsequent out-of-bounds write. No active exploitation or public proof-of-concept is known at time of analysis; EPSS score is low (0.29%).

Affected VersionsENISA

FFmpeg patch: 5d7112c60e6f0f0742ce47d448e6da0718a70f4c

FFmpeg 0 ≤8.1.2

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 7.7 HIGH

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SUSE 7.1 HIGH

AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

Red Hat 8.8 HIGH

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

Present

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 through 8.1.2, fixed in commit 5d7112c, contains a heap out-of-bounds write vulnerability in the vf_hqdn3d filter that allows attackers to corrupt heap memory by supplying a crafted video whose frame resolution increases between frames when filtergraph reinitialization is disabled via the -reinit_filter 0 option. Attackers can provide a malicious video input where vf_hqdn3d.config_input() allocates undersized per-plane line-history buffers based on the initial frame width, and subsequent larger frames cause denoise_spatial() to write beyond the allocation boundary, resulting in heap memory corruption.

Threat Intelligence Overview

EPSS Score

0.3%

Top 79% 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 0.3%

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· derived

Scheduled

Exploitation

None

System Exposure· derived

Open

Automatable

No

Human Impact· derived

Medium

Technical Impact

Total

Priority Score

38

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +38

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.

Heap Overflow HIGH

A heap overflow occurs when a program writes data beyond the bounds of a buffer allocated in the heap memory region.

More in Ffmpeg

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CVE-2016-1897 MEDIUM This Month POC

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

CVE-2017-9993 HIGH Act Now

FFmpeg before 2.8.12, 3.0.x and 3.1.x before 3.1.9, 3.2.x before 3.2.6, and 3.3.x before 3.3.2 does not properly restric

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

CVE-2013-4265 CRITICAL Act Now POC

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

CVE-2020-12284 CRITICAL Act Now POC

cbs_jpeg_split_fragment in libavcodec/cbs_jpeg.c in FFmpeg 4.1 and 4.2.2 has a heap-based buffer overflow during JPEG_MA

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Out-of-bounds heap write in FFmpeg's RASC video decoder (decode_dlta in libavcodec/rasc.c) allows attackers to corrupt m

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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

CVE-2021-38094 HIGH This Week POC

Integer Overflow vulnerability in function filter_sobel in libavfilter/vf_convolution.c in Ffmpeg 4.2.1, allows attacker

CVE-2021-38093 HIGH This Week POC

Integer Overflow vulnerability in function filter_robert in libavfilter/vf_convolution.c in Ffmpeg 4.2.1, allows attacke

CVE-2021-38092 HIGH This Week POC

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

CVE-2021-38091 HIGH This Week POC

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

CVE-2021-38090 HIGH This Week POC

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

Same weakness CWE-122 – Heap-based Buffer Overflow

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CVE-2026-53362 HIGH POC

CVE-2025-21418 HIGH

Same technique Buffer Overflow

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CVE-2017-7269 CRITICAL POC

CVE-2015-5119 CRITICAL POC

CVE-2015-3113 CRITICAL POC

CVE-2011-2462 CRITICAL POC

CVE-2020-0796 CRITICAL POC

CVE-2019-11043 CRITICAL POC

CVE-2009-0927 HIGH POC

CVE-2012-1889 HIGH POC

Vendor StatusVendor

SUSE

Severity: Important

Product	Status
SUSE Linux Enterprise Desktop 15 SP7	Not-Affected
SUSE Linux Enterprise Desktop 15 SP7	Affected
SUSE Linux Enterprise High Performance Computing 15 SP7	Not-Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7	Not-Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7	Not-Affected

References

Advisories & patches

PATCH https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/5d7112c60e6f0f0742ce47d448e6da0718a70f4c ADVISORY https://ubuntu.com/security/notices/USN-8671-1 ADVISORY https://vuldb.com/vuln/383013 REF https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23783 REF https://www.vulncheck.com/advisories/ffmpeg-heap-out-of-bounds-write-in-vf-hqdn3d-filter

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