CVE-2026-64834Network attack vector

Service interruption via undersized ASF object loop

Published Jul 22, 2026 · Updated Jul 22, 2026

Infinite loop in FFmpeg 0.6.3 through 8.1.2 allows remote attackers to interrupt service via a crafted RTP/ASF stream. The rtp_asf_fix_header function accepts an ASF object chunksize below the 24-byte header minimum, so its parser pointer never advances. Exploitation requires an active application to ingest and demux an untrusted real-time stream, consuming CPU and stalling the processing worker.

CVSS severity8.7
High
EPSS probability0.50%
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

Infinite loop in FFmpeg 0.6.3 through 8.1.2 allows remote attackers to interrupt service via a crafted RTP/ASF stream. The rtp_asf_fix_header function accepts an ASF object chunksize below the 24-byte header minimum, so its parser pointer never advances. Exploitation requires an active application to ingest and demux an untrusted real-time stream, consuming CPU and stalling the processing worker.

The record

CVE
CVE-2026-64834
Published
Jul 22, 2026
Updated
Jul 22, 2026
Vendor
FFmpeg
Product
FFmpeg
Classifications
CWE-835, T1499
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=0.6.3 <=8.1.2
  2. Affected versionversion=11d5f475be95d22d5f0692220cc772b116abc632

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FFmpeg · FFmpegversion=0.6.3 <=8.1.2; version=11d5f475be95d22d5f0692220cc772b116abc632

Published CVSS scores

7.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499Endpoint Denial of Service

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