What is CVE-2025-63757?

CVE-2025-63757 is a high-severity vulnerability in Ffmpeg, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2025-12-18.

How severe is CVE-2025-63757?

High severity. CVSS v3 base score is 7.5 out of 10.

Integer overflow in Ffmpeg

CVE-2025-63757

Integer overflow vulnerability in the yuv2ya16_X_c_template function in libswscale/output.c in FFmpeg 8.0.

Vulnerability class: Integer Overflow

Published 2025-12-18 · last modified 2026-06-17.

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: 0.004 (29.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 29.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Ffmpeg — versions 8

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20698 (Issue Tracking)
gist.github.com/miora-sora/43c1c5616dd5b4f960a9d20296ef4833 (Patch)
ffmpeg.org/security.html (Product)

Frequently asked questions

What is CVE-2025-63757?: CVE-2025-63757 is a high-severity vulnerability in Ffmpeg, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2025-12-18.
How severe is CVE-2025-63757?: High severity. CVSS v3 base score is 7.5 out of 10.