CVE-2026-30754 FFmpeg - Buffer Overflow

FFmpeg < 8.1 contains a buffer overflow caused by passing a negative size parameter to memcpy in nal_send function during RTP encoding of H.264/HEVC streams, letting attackers cause memory corruption via crafted input file.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.51% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Denial Of Service, Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
8 September 2026
Updated
15 October 2026
Weakness
CWE-787

Vendor fix

Update to version 8.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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