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NVD / CVE Program· CNA VulnCheck

CVE-2026-75143: FFmpeg Heap Buffer Overflow via RIST Protocol Reader

CriticalCVSS 9.3 · v4.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 37/100)

  • 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: 0.70% (FIRST EPSS); higher than 53.7% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: FFmpeg FFmpeg 1c10bcc2e17255dacb717a25ab3db142ce390602.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to FFmpeg FFmpeg 1c10bcc2e17255dacb717a25ab3db142ce390602 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 1c10bcc contains a heap buffer overflow in the RIST protocol reader (libavformat/librist.c). librist_read() ignored its size argument and copied the full received payload length into the caller-provided destination buffer, overflowing it when the payload exceeds the destination size. This is reachable via the async:rist:// URL scheme, where the async wrapper supplies a smaller buffer than the received payload. A remote RIST sender can trigger the overflow by sending a packet whose payload exceeds the caller buffer size.

Published
Aug 19, 2026
Updated
Oct 27, 2026
EPSS
0.7% · 53th percentile

Report tools

JSON

Action score

37

Monitor

Low priority for now.

CVSS
37 / 40 · 9.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · VulnCheck
9.3
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/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.

Follow CVE-2026-75143

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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.

—

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 1c10bcc2e17255dacb717a25ab3db142ce390602affected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12ffmpegfrom 0—
Debian:14ffmpegbefore 7:9.0.2-17:9.0.2-1
openSUSE:Tumbleweedffmpeg-4before 4.4.8-5.14.4.8-5.1
openSUSE:Tumbleweedffmpeg-8before 8.1.2-3.18.1.2-3.1
openSUSE:Tumbleweedffmpeg-9before 9.0.1-3.19.0.1-3.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSffmpeg-4before 4.4.8-150400.3.75.14.4.8-150400.3.75.1
SUSE:Linux Enterprise Module for Package Hub 15 SP7ffmpeg-4before 4.4.8-150600.13.55.14.4.8-150600.13.55.1

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…
    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…
    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…
    42Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-75141Aug 19, 2026 · FFmpeg Heap Buffer Overflow in hvcC Box Writer via HEVC Muxing
    34Monitor
  • ← EarlierCVE-2026-75142Aug 19, 2026 · FFmpeg Stack Buffer Overflow in MPEG-PS Muxer via mpegenc.c
    34Monitor
  • Later →CVE-2026-75144Aug 19, 2026 · FFmpeg Heap Buffer Overflow in VC-2/Dirac RTP Packetizer
    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 / packageFixed versionSource
FFmpeg FFmpeg1c10bcc2e17255dacb717a25ab3db142ce390602Vendor (CNA)
debian:ffmpeg7:9.0.2-1 · Debian:14Package registry (OSV)
opensuse:ffmpeg-44.4.8-5.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:ffmpeg-88.1.2-3.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:ffmpeg-99.0.1-3.1 · openSUSE:TumbleweedPackage registry (OSV)
suse:ffmpeg-44.4.8-150600.13.55.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP7Package 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.

Variant candidates

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

  • CVE-2026-751410 days apartFFmpeg Heap Buffer Overflow in hvcC Box Writer via HEVC Muxing
    34Monitor
  • CVE-2026-751440 days apartFFmpeg Heap Buffer Overflow in VC-2/Dirac RTP Packetizer
    34Monitor
  • CVE-2026-6603926 days apartFFmpeg MACE6 Audio Decoder Heap Out-of-Bounds Write via CAF File
    34Monitor
  • CVE-2026-6604026 days apartFFmpeg Heap Out-of-Bounds Write via PNG/APNG eXIf Encoder
    34Monitor
  • CVE-2026-6483028 days apartFFmpeg 2.1 - 8.1.2 Heap Buffer Overflow via VobSub Subtitle Demuxer
    34Monitor
  • CVE-2026-12525082 days apartFFmpeg through 9.0.2 GIF Encoder Heap Buffer Overflow via shrunk_buf Remap
    34Monitor

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

Not on record for this CVE: public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-122 · Heap-based Buffer Overflow

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/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.

ATT&CK techniques

—

References

Show all references (2 more)

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

All records