Medium Denial of service

CVE-2026-107677 — FFmpeg through 9.0.2 DASH Demuxer Infinite Loop via Empty SegmentTemplate Media

FFmpeg through 9.0.2 contains a denial of service vulnerability in the DASH demuxer that allows attackers to trigger an infinite loop by supplying an empty SegmentTemplate media URL. Attackers can craft an .mpd manifest declaring SegmentTemplate media="" so get_current_fragment() calls av_strireplace() with an empty search string, consuming CPU indefinitely.

Published Oct 8, 2026 · Updated Oct 14, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · 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

EPSS 0.1% (30-day exploitation probability)+0
Technical severity (medium)+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

0.14%

ahead of 3% of scored CVEs · Oct 15, 2026

Affects

Ffmpeg

CVSS base

4.7

Medium · 3 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

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).
Apply the fixed version or the patch documented under Remediation.
Exploitation requires user interaction: tighten email/web filtering and warn affected users.
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	≤ 9.0.2	Vulnerable	CVE Program (cve.org) e CISA ADP
Ffmpeg	Ffmpeg	≤ 9.0.2	Vulnerable	NIST National Vulnerability Database

Attack characteristics

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

Attack vector

Local

Attack complexity

High

Privileges required

None

User interaction

Required

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
5.7	CVSS 4.0	Medium	—	—	disclosure@vulncheck.com via NIST National Vulnerability Database
5.7	CVSS 4.0	Medium	—	—	VulnCheck via CVE Program (cve.org) e CISA ADP
4.7	CVSS 3.1	Medium	1.0	3.6	disclosure@vulncheck.com via NIST National Vulnerability Database
4.7	CVSS 3.1	Medium	—	—	GitHub, Inc. via GitHub Security Advisories
4.7	CVSS 3.1	Medium	—	—	VulnCheck via CVE Program (cve.org) e CISA ADP

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/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 →

EPSS over time FIRST

Oct 13, 2026 → Oct 15, 2026 · 3 reading(s) · max 0.14%

Detection

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

Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
Track CPU/memory spikes and availability drops correlated with request patterns.

endpoint telemetry (EDR)resource metrics

Timeline

What happened to this CVE, newest first.

2026
Fix documented
Oct 14, 2026 · NIST National Vulnerability Database
Affected products added · ffmpeg/ffmpeg
Oct 14, 2026 · NIST National Vulnerability Database
Source status changed · Undergoing Analysis → Analyzed
Oct 14, 2026 · NIST National Vulnerability Database
Affected products added · ffmpeg/ffmpeg
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
CVSS changed · 4.7
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Undergoing Analysis
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
CVE published
Oct 8, 2026 · VulnCheck

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 14, 2026 – Oct 14, 2026
1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

9 on the record

code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24592
patch, Issue Tracking, Patch, NIST National Vulnerability Database
code.ffmpeg.org/FFmpeg/FFmpeg/commit/ed27bfcbbbc0872c0195eaf4dd2c0c93b9f1778e
patch, Patch, NIST National Vulnerability Database
github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavutil/avstring.c
technical-description, Product, NIST National Vulnerability Database
www.vulncheck.com/advisories/ffmpeg-through-9.0.2-dash-demuxer-infinite-loop-via-empty-
third-party-advisory, Third Party Advisory, NIST National Vulnerability Database
ffmpeg.org
GitHub Security Advisories
github.com/advisories/GHSA-23w5-87r9-849m
GitHub Security Advisories
ffmpeg.org/
product, Product, NIST National Vulnerability Database
github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavformat/dashdec.c
technical-description, Product, NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2026-107677
GitHub Security Advisories

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
Low CVE-2026-107676 FFmpeg through 9.0.2 Uninitialized Memory Disclosure via HDR10+ Metadata Serializer 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 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-2026-107677 is "FFmpeg through 9.0.2 DASH Demuxer Infinite Loop via Empty SegmentTemplate Media", rated Medium. It affects Ffmpeg (Ffmpeg); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 4.7 describes technical severity. EPSS 0.14% estimates the probability of exploitation in 30 days; neither replaces your asset context. 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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