Vulnerability details
CVE-2026-75141
FFmpeg FFmpeg
FFmpeg Heap Buffer Overflow in hvcC Box Writer via HEVC Muxing
CVSS 4.0
8.5High
Official description
FFmpeg before commit acf5d7c contains a heap buffer overflow in the hvcC box writer. When writing an HEVC configuration record with more NAL units of a single type than the count field can represent, the NAL unit count overflows, causing a heap buffer overflow. A crafted HEVC input file triggers the overflow during muxing.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.5High | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| 7.8High | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| FFmpeg | FFmpeg | v < acf5d7cdc1f9ae8752c23e1ea8d7f355ed780781 | CVEProject cvelistV5 (CNA) |
References and advisories
3
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Details
- Published
- 2026-08-19
- Last updated
- 2026-10-27
- State
- Published
- Assigner (CNA)
- VulnCheck
Exploit prediction (EPSS)
0.19%
Probability of exploitation in 30 days
9.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-122Heap-based Buffer Overflow