Vulnerability record
CVE-2026-125269
The short answer
CVE-2026-125269 affects FFmpeg FFmpeg and is rated high (CVSS 7.3). It is not in CISA's KEV catalog; EPSS puts the chance of exploitation in the next 30 days at 0.13%.
What it is
FFmpeg through 9.0.2 contains a double free vulnerability in libavcodec/cbs_sei.c where cbs_sei_delete_message() leaves a stale extension_data reference that ff_cbs_sei_add_message() reuses. Attackers can supply a crafted H.264 stream with a display orientation SEI message followed by payload extension data, processed by h264_metadata with display_orientation=insert, to corrupt heap memory.
Weakness: CWE-415.
Severity
7.3 high
CVSS:4.0/AV:L/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Exploited (CISA KEV)
Not listed
CISA lists confirmed exploitation only
EPSS, next 30 days
0.13%
Higher than 3% of scored CVEs
How it can be exploited
- Attack vector
- Local
- Attack complexity
- High
- Attack requirements
- Present
- Privileges required
- None
- User interaction
- Passive
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Affected products
FFmpeg. NVD's record lists the exact affected versions.
References
- code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25020
- github.com/FFmpeg/FFmpeg
- github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/cbs_sei.c#L287
- github.com/FFmpeg/FFmpeg/commit/2c515eea07df719379e7f73deeeb7ccb8768433f
- www.vulncheck.com/advisories/ffmpeg-through-9.0.2-double-free-via-cbs-sei-delete-message-in-cbs-sei-c
Questions
Is CVE-2026-125269 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog as of 2026-11-11. FIRST's EPSS estimates a 0.13% chance of exploitation in the next 30 days.
How do I fix CVE-2026-125269?
Follow the vendor advisory in the references below. NVD lists the affected versions under its configurations.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Awaiting Analysis. The description is NVD's text, quoted as published.
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