Is there a public exploit for CVE-2026-125103?

No public exploit for CVE-2026-125103 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-125103?

CVE-2026-125103 scores CVSS 4.8 (v4.0), rated medium.

What does CVE-2026-125103 affect?

CVE-2026-125103 affects FFMPEG FFmpeg.

4.8 Medium

FFmpeg through 9.0.2 contains an information disclosure vulnerability in ffmlzdecompression() in libavcodec/mlz.c, which accepts string…

CVE-2026-125103

FFmpeg through 9.0.2 contains an information disclosure vulnerability in ffmlzdecompression() in libavcodec/mlz.c, which accepts string codes beyond the dictionary's next free code. Attackers can supply a crafted MPEG-4 ALS file with malformed initial or out-of-range codes to copy uninitialized heap bytes into decoded audio output.

Assessment

CVSS: 4.8 (v4.0)
Severity: Medium
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 9 November 2026
Last updated: 9 November 2026
Affected: FFMPEG · FFmpeg
Assigner: VulnCheck

CVSS vectorCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

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