CVE-2026-64830Network attack vector

Code execution via VobSub queue overflow

Published Jul 22, 2026 · Updated Jul 22, 2026

Heap buffer overflow in FFmpeg 2.1 through 8.1.2 allows attackers to corrupt memory by processing a crafted VobSub subtitle file. In libavformat/mpeg.c, vobsub_read_header() accepts more distinct stream IDs than the fixed vobsub->q[] array holds, and ff_subtitles_queue_insert() writes past its end. Successful exploitation requires an application or user to process the subtitle file and results in a process crash or arbitrary code execution within that process.

CVSS severity8.7
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Heap buffer overflow in FFmpeg 2.1 through 8.1.2 allows attackers to corrupt memory by processing a crafted VobSub subtitle file. In libavformat/mpeg.c, vobsub_read_header() accepts more distinct stream IDs than the fixed vobsub->q[] array holds, and ff_subtitles_queue_insert() writes past its end. Successful exploitation requires an application or user to process the subtitle file and results in a process crash or arbitrary code execution within that process.

The record

CVE
CVE-2026-64830
Published
Jul 22, 2026
Updated
Jul 22, 2026
Vendor
FFmpeg
Product
FFmpeg
Classifications
CWE-122, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.1 <=8.1.2
  2. Affected versionversion=dbd495f066a85ba96b17433f4306582aa37c3951

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FFmpeg · FFmpegversion=2.1 <=8.1.2; version=dbd495f066a85ba96b17433f4306582aa37c3951

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo