FFmpeg Stack Buffer Overflow in MPEG-PS Muxer via mpegenc.c
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: 0.19% (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 FFmpeg 9d786e4b5e9b8482651928574de33772aeee7be1.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to FFmpeg FFmpeg 9d786e4b5e9b8482651928574de33772aeee7be1 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 before commit 9d786e4 contains a stack buffer overflow in the MPEG-PS muxer (libavformat/mpegenc.c). When muxing input with more streams than the muxer's fixed-size stack buffer accommodates, the buffer is overflowed. A crafted input with an excessive number of streams triggers the overflow during MPEG-PS muxing.
- Published
- Aug 19, 2026
- Updated
- Sep 9, 2026
- EPSS
- 0.1% · 9th percentile
- CWE
- CWE-121
Report tools
Action score
34
Monitor
Low priority for now.
- CVSS
- 34 / 40 · 8.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.1%
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.
We use this product, ask for helpAffected 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.
—
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
- before 9d786e4b5e9b8482651928574de33772aeee7be1affected · git
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: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 recordsOther 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 trigger45Plan
- 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 all42Plan
- 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 craf42Plan
Published before and after this one in the same product
- ← EarlierCVE-2026-70632Aug 6, 2026 · FFmpeg 4.4 < 9.0 Heap Out-of-Bounds Write in CFHD Decoder via AVI Demuxing34Monitor
- ← EarlierCVE-2026-75141Aug 19, 2026 · FFmpeg Heap Buffer Overflow in hvcC Box Writer via HEVC Muxing34Monitor
- Later →CVE-2026-75143Aug 19, 2026 · FFmpeg Heap Buffer Overflow via RIST Protocol Reader37Monitor
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 |
|---|---|---|
| FFmpeg FFmpeg | 9d786e4b5e9b8482651928574de33772aeee7be1 | Vendor (CNA) |
| 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-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.
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 researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
- CVE-2026-6483128 days apartFFmpeg 8.0 - 8.1.2 Stack Buffer Overflow in Vulkan HEVC Decoder34Monitor
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-26-0878 · Aug 20, 2026(FFmpeg Güvenlik Zafiyeti)
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-121 · Stack-based Buffer OverflowCVSS 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✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (2 more)Show less
Vendor advisories and official records. Exploit/PoC links are deliberately left out.