NVD / CVE Program· CNA VulnCheck

CVE-2026-70632: FFmpeg 4.4 < 9.0 Heap Out-of-Bounds Write in CFHD Decoder via AVI Demuxing

Noroxi assessment

Priority: Monitor (action score 34/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.20% (FIRST EPSS).
Someone with local access to the system can trigger it. No account or password is required. No special conditions are required; it is repeatable.
Fixed version: ffmpeg (Debian:14) 7:9.0.2-1; ffmpeg-7 (openSUSE:Leap 16.0) 7.1.5-160000.1.1; ffmpeg-4 (openSUSE:Tumbleweed) 4.4.8-5.1.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to ffmpeg (Debian:14) 7:9.0.2-1; ffmpeg-7 (openSUSE:Leap 16.0) 7.1.5-160000.1.1; ffmpeg-4 (openSUSE:Tumbleweed) 4.4.8-5.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

FFmpeg versions from 4.4 up to, but not including, 9.0 contain an out-of-bounds heap write vulnerability in the native GoPro CineForm HD (CFHD) decoder that allows remote attackers to corrupt heap memory by supplying a crafted AVI file during stream probing. The cfhd_decode() function fails to enforce the non-Bayer logical output-width invariant in the transform-type-2 reconstruction path, causing horiz_filter_clip() to write oversized 16-bit sample rows far beyond the allocated output frame buffer, which can be escalated to arbitrary code execution via overwrite of a live cleanup callback pointer.

HighCVSS 8.5 · v4.0—No exploit Fix available

Published: Aug 6, 2026
Updated: Sep 1, 2026
EPSS: 0.2% · 9th percentile
CWE: CWE-787

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 34 / 40 · 8.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · VulnCheck: 8.5; NVD has not scored this yet; the score shown is the CNA’s.

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
ffmpeg	ffmpeg	cpe:2.3:a:ffmpeg:ffmpeg

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

ffmpeg ffmpeg4.4 and later · before 9

Versions reported by the vendor

Affected version ranges reported by the assigning authority (VulnCheck). Independent of NVD's CPE analysis and usually ahead of it.

FFmpeg FFmpeg
- 4.4 and later · before 9.0affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	ffmpeg	from 0	—
Debian:14	ffmpeg	before 7:9.0.2-1	7:9.0.2-1
openSUSE:Leap 16.0	ffmpeg-7	before 7.1.5-160000.1.1	7.1.5-160000.1.1
openSUSE:Tumbleweed	ffmpeg-4	before 4.4.8-5.1	4.4.8-5.1
openSUSE:Tumbleweed	ffmpeg-8	before 8.1.2-3.1	8.1.2-3.1
openSUSE:Tumbleweed	ffmpeg-9	before 9.0.1-3.1	9.0.1-3.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS	ffmpeg-4	before 4.4.8-150400.3.75.1	4.4.8-150400.3.75.1
SUSE:Linux Enterprise Module for Package Hub 15 SP7	ffmpeg-4	before 4.4.8-150600.13.55.1	4.4.8-150600.13.55.1

Same product

ffmpeg: all records

Other highest-scoring records for the same primary product.

CVE-2009-4637FFmpeg 0.5 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via unknown vectors that trigger
45Plan
CVE-2016-10190Heap-based buffer overflow in libavformat/http.c in FFmpeg before 2.8.10, 3.0.x before 3.0.5, 3.1.x before 3.1.6, and 3.2.x before 3.2.2 all
42Plan
CVE-2009-4634Multiple integer underflows in FFmpeg 0.5 allow remote attackers to cause a denial of service and possibly execute arbitrary code via a craf
42Plan

Published before and after this one in the same product

← EarlierCVE-2026-70630Aug 6, 2026 · FFmpeg 3.0 < 9.0 Uninitialized Heap Memory Read in Screenpresso Decoder
27Monitor
← EarlierCVE-2026-70631Aug 6, 2026 · FFmpeg 0.5 < 9.0 Uninitialized Heap Memory Read in TIFF Decoder
27Monitor
Later →CVE-2026-75141Aug 19, 2026 · FFmpeg Heap Buffer Overflow in hvcC Box Writer via HEVC Muxing
34Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
debian:ffmpeg	7:9.0.2-1 · Debian:14	Package registry (OSV)
opensuse:ffmpeg-4	4.4.8-5.1 · openSUSE:Tumbleweed	Package registry (OSV)
opensuse:ffmpeg-7	7.1.5-160000.1.1 · openSUSE:Leap 16.0	Package registry (OSV)
opensuse:ffmpeg-8	8.1.2-3.1 · openSUSE:Tumbleweed	Package registry (OSV)
opensuse:ffmpeg-9	9.0.1-3.1 · openSUSE:Tumbleweed	Package registry (OSV)
suse:ffmpeg-4	4.4.8-150600.13.55.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP7	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Adrian Junge (vurlo)finder

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2026-3075433 days apartA memory corruption vulnerability exists in FFmpeg before 8.1.
35Monitor
CVE-2026-5804940 days apartFFmpeg - Out-of-Bounds Write in RASC Decoder decode_dlta()
35Monitor
CVE-2026-846149 days apartHeap out-of-bounds write via odd slice_height in FFmpeg MagicYUV decoder
35Monitor
CVE-2026-6570314 days apartFFmpeg 2.7 - 8.1.2 Out-of-Bounds Write in TDSC Video Decoder
34Monitor
CVE-2026-6483515 days apartFFmpeg 4.4 - 8.1.2 Out-of-Bounds Memory Access in ADX Audio Decoder
34Monitor
CVE-2025-59733304 days apartHeap-buffer-overflow write in FFmpeg EXR dwa_uncompress
34Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-26-0778 · Aug 7, 2026(FFmpeg Güvenlik Zafiyeti)

All national notices →

Technical details

Attack conditions

Someone with local access to the system can trigger it.
No account or password is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability

Attack vector: Local
Attack complexity: Low
Privileges required: None
User interaction: P
Scope: X

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

Fix✗ → ✓Sep 28, 2026, 10:49 PM UTC

For records you follow, these changes also arrive as notifications. →

References

code.ffmpeg.org/FFmpeg/FFmpeg/commit/1006a2151236f9235bf02822f263b3fb0532111e

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records