High Denial of service

CVE-2026-64834 — FFmpeg 0.6.3 - 8.1.2 Infinite Loop DoS via RTP/ASF Demuxer

FFmpeg versions 0.6.3 through 8.1.2 contain an infinite loop vulnerability in the RTP/ASF demuxer within libavformat/rtpdec_asf.c that allows remote attackers to cause denial of service by sending a crafted RTP/ASF stream. The rtp_asf_fix_header function fails to validate a minimum chunksize when iterating over ASF objects, causing the loop pointer to never advance when a chunksize is smaller than the 24-byte minimum ASF object header size, resulting in CPU exhaustion that denies service to legitimate users.

Published Jul 22, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: VulnCheck

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

Technical severity (high)+6
Automatable exploitation (SSVC)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

—

No EPSS score.

Affects

Ffmpeg

CVSS base

7.5

High · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

Yes

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

Documented patch — code.ffmpeg.org (NIST National Vulnerability Database)
Documented patch — code.ffmpeg.org (NIST National Vulnerability Database)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Ffmpeg Ffmpeg).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
Apply the fixed version or the patch documented under Remediation.
Search available logs for exploit probes matching the vulnerability class (denial of service), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Ffmpeg	Ffmpeg	≥ 0.6.3 and ≤ 8.1.2	Vulnerable	NIST National Vulnerability Database
Ffmpeg	Ffmpeg	≥ 0.6.3 and ≤ 8.1.2version 11d5f475be95d22d5f0692220cc772b116abc632	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
8.7	CVSS 4.0	High	—	—	disclosure@vulncheck.com via NIST National Vulnerability Database
8.7	CVSS 4.0	High	—	—	VulnCheck via CVE Program (cve.org) e CISA ADP
7.5	CVSS 3.1	High	3.9	3.6	disclosure@vulncheck.com via NIST National Vulnerability Database
7.5	CVSS 3.1	High	—	—	VulnCheck via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (score shown at the top: disclosure@vulncheck.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-835 · Infinite Loop

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Track CPU/memory spikes and availability drops correlated with request patterns.

web/proxy/WAF logsnetwork IDS/IPSresource metrics

Timeline

What happened to this CVE, newest first.

2026
Affected products added · ffmpeg/ffmpeg
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 15, 2026
Fix documented
Oct 15, 2026 · NIST National Vulnerability Database
CVSS changed · 7.5
Oct 15, 2026 · NIST National Vulnerability Database
Source status changed · → Analyzed
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Jul 22, 2026 · VulnCheck

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

3 on the record

code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23663
Issue Tracking, Patch, issue-tracking, NIST National Vulnerability Database
code.ffmpeg.org/FFmpeg/FFmpeg/commit/11d5f475be95d22d5f0692220cc772b116abc632
Patch, patch, NIST National Vulnerability Database
www.vulncheck.com/advisories/ffmpeg-infinite-loop-dos-via-rtp-asf-demuxer
Third Party Advisory, third-party-advisory, NIST National Vulnerability Database

Elsewhere on this site

Ffmpeg
every CVE for this vendor

Denial of service
same class

CWE-835
other pages naming this weakness

Related CVEs (same products)

Medium CVE-2026-107698 FFmpeg before 7.1.4 and 8.0.2 SSRF via RTSP Redirect Handling 7d
Medium CVE-2026-107696 FFmpeg through 9.0.2 Infinite Loop via RTSP Redirect Handling in rtsp.c 7d
Medium CVE-2026-107697 FFmpeg before 8.1.3 HLS Demuxer Security Check Bypass via parse_playlist() 7d
Medium CVE-2026-107695 FFmpeg before 8.1.3 HLS Demuxer Infinite Loop via Self-Referencing Playlist 7d
Medium CVE-2026-107677 FFmpeg through 9.0.2 DASH Demuxer Infinite Loop via Empty SegmentTemplate Media 7d
Medium CVE-2026-107675 FFmpeg through 9.0.2 Missing SSH Host Key Verification in sftp Protocol 7d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No FIRST EPSS score.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-64834 is "FFmpeg 0.6.3 - 8.1.2 Infinite Loop DoS via RTP/ASF Demuxer", rated High. It affects Ffmpeg (Ffmpeg); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.5 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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