Buffer overflow in Ffmpeg
CVE-2026-30999
A heap buffer overflow in the av_bprint_finalize() function of FFmpeg v8.0.1 allows attackers to cause a Denial of Service (DoS) via a crafted input.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (52.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.007 · change: +0.003
Affected products
Weakness classification (CWE)
References
- github.com/FFmpeg/FFmpeg/blob/master/tools/zmqsend.c (Product)
- ffmpeg.org/doxygen/7.0/zmqsend_8c_source.html (Product)
- www.ffmpeg.org/download.html (Product)
- excellent-oatmeal-319.notion.site/CVE-2026-30999-Memory-Leak-e0d88ac53e2e42c1b5… (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-30999?
- CVE-2026-30999 is a high-severity vulnerability in Ffmpeg, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-04-13.
- How severe is CVE-2026-30999?
- High severity. CVSS v3 base score is 7.5 out of 10.