CVE-2026-107660

MEDIUMPre-NVD 4.84.8—
EchelonGraph scoreHIGH confidence

Score 4.8 from GitHub Security Advisory published 2026-10-08. A secondary CVSS source baseline 4.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: ghsa, secondary
Trending — 4 sources updated this week
4.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 4.8Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

FFmpeg before 8.1.3 and 9.x before 9.0.2 contains an improper certificate validation vulnerability in tls_open() of libavformat/tls_mbedtls.c, which skips hostname checks for IP-address hosts. Network attackers can intercept https, rtmps, or tls connections to IP-literal URLs with any trusted CA-issued certificate to read and tamper with streams.

CVSS v3
4.8
EG Score
4.8MEDIUMhigh confidence
EG Risk
22
EG Risk 22/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity48% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.1%
EPSS %ILE
2nd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

October 8, 2026

Last Modified

October 8, 2026

Advisory Details (7)

Auto-updated Oct 8, 2026
⚠️ Active exploitation confirmed. No fix on record yet.
generic

FFmpeg before 8.1.3 and 9.x before 9.0.2 mbedTLS Hostname Verification Bypass for IP Hosts | Advisories | VulnCheck

https://www.vulncheck.com/advisories/ffmpeg-before-8.1.3-and-9-x-before-9.0.2-mbedtls-hostname-verification-bypass-for-ip-hosts
generic🔴 Active Exploitation

FFmpeg

https://ffmpeg.org/
generic

FFmpeg/libavformat/tls_mbedtls.c at n9.0.1 · FFmpeg/FFmpeg · GitHub

https://github.com/FFmpeg/FFmpeg/blob/n9.0.1/libavformat/tls_mbedtls.c#L676-L681
generic

avformat/tls_mbedtls: set the expected hostname for numeric hosts · 0cd2a70eac - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/0cd2a70eacd510c2efed48b9fc177c7cb2bc549f
generic

avformat/tls_mbedtls: set the expected hostname for numeric hosts · d377212904 - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/d377212904a19fc740d721cbda0ba58fa3805a29
generic

avformat/tls_mbedtls: set the expected hostname for numeric hosts · 57a2e704b4 - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/57a2e704b4a6eda5d061b45aacde6b19c026bfc0
generic

#24383 - avformat/tls_mbedtls: set the expected hostname for numeric hosts - FFmpeg/FFmpeg - FFmpeg Forgejo

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24383

Vendor Advisories for CVE-2026-107660(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 9× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-09 20:06 UTCEPSS rescore
  2. 2026-10-09 19:15 UTCGHSA enrichment
  3. 2026-10-08 21:17 UTCGHSA enrichment
  4. 2026-10-08 18:36 UTCEG score recompute
  5. 2026-10-08 18:36 UTCGHSA enrichment
  6. 2026-10-08 17:31 UTCEG score recompute
  7. 2026-10-08 16:25 UTCEG score recompute
  8. 2026-10-08 15:37 UTCEG score recompute
  9. 2026-10-08 15:36 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-107660?
CVE-2026-107660 is a medium vulnerability published on October 8, 2026. FFmpeg before 8.1.3 and 9.x before 9.0.2 contains an improper certificate validation vulnerability in tlsopen() of libavformat/tlsmbedtls.c, which skips hostname checks for IP-address hosts. Network attackers can intercept https, rtmps, or tls connections to IP-literal URLs with any trusted…
When was CVE-2026-107660 disclosed?
CVE-2026-107660 was first published on October 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-107660 actively exploited?
CVE-2026-107660 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-107660?
CVE-2026-107660 has a CVSS base score of 4.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-107660?
No fix for CVE-2026-107660 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-107660 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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