---
title: "CVE-2026-30754: FFmpeg - Buffer Overflow"
description: "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."
url: https://panop.io/threat-heartbeat/CVE-2026-30754/
---

# 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 ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-30754)

## 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](https://cwe.mitre.org/data/definitions/787.html)

## 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

- [https://nvd.nist.gov/vuln/detail/CVE-2026-30754](https://nvd.nist.gov/vuln/detail/CVE-2026-30754)
- [https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20746](https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20746)
- [https://gist.github.com/momo-trip/4cddf2c9e15600873de55259dac6b0e6](https://gist.github.com/momo-trip/4cddf2c9e15600873de55259dac6b0e6)
- [https://github.com/momo-trip/poc\_ffmpeg](https://github.com/momo-trip/poc_ffmpeg)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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