CVE-2026-30754Public exploit

Memory corruption via truncated NAL length field

Published Sep 8, 2026 · Updated Sep 9, 2026

Memory corruption in FFmpeg before 8.1 allows attackers to crash the process via a crafted H.264 or HEVC file during RTP encoding. In ff_rtp_send_h264_hevc(), a truncated length-prefixed NAL advances the buffer pointer beyond the remaining data, so nal_send() passes a negative byte count to memcpy. The target must process the crafted file through the RTP muxer; the published reproducer demonstrates an AddressSanitizer abort, while code execution is not established.

CVSS severityUnavailable
Unscored
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Memory corruption in FFmpeg before 8.1 allows attackers to crash the process via a crafted H.264 or HEVC file during RTP encoding. In ff_rtp_send_h264_hevc(), a truncated length-prefixed NAL advances the buffer pointer beyond the remaining data, so nal_send() passes a negative byte count to memcpy. The target must process the crafted file through the RTP muxer; the published reproducer demonstrates an AddressSanitizer abort, while code execution is not established.

The record

CVE
CVE-2026-30754
Published
Sep 8, 2026
Updated
Sep 9, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo