Is there a public exploit for CVE-2026-126188?

No public exploit for CVE-2026-126188 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-2026-126188?

CVE-2026-126188 scores CVSS 3.7 (v3.1), rated low. EPSS puts the chance of exploitation in the next 30 days at 0.00279%.

What does CVE-2026-126188 affect?

CVE-2026-126188 affects activestorage.

3.7 Low

Active Storage: Possible local file disclosure in video previews and analysis

CVE-2026-126188

Impact Active Storage's VideoPreviewer, VideoAnalyzer and AudioAnalyzer run ffmpeg and ffprobe on a blob's contents without restricting the input format, so FFmpeg selects a demuxer by probing the file. A blob created through a direct upload keeps the content type the client declared, so a client can store an HLS playlist under a video/ or audio/ type. When that blob is previewed or analyzed, the hls demuxer opens the file:// segments that the playlist names, and the preview image or the stored metadata could disclose a local media file that the application process can read and whose path the attacker knows. Applications that accept uploads from untrusted users and generate video previews, or analyze video or audio attachments with FFmpeg, are affected. Details The fixed releases limit the formats FFmpeg may open to common audio and video containers, configured by the new config.activestorage.ffmpegallowedformats setting. Files in other formats no longer preview or receive media metadata; the Active Storage CHANGELOG names some of them and shows how to add a format to the list. Workarounds Applications that cannot upgrade can stop Active Storage from running FFmpeg on uploaded…

Assessment

CVSS: 3.7 (v3.1)
Severity: Low
EPSS: 0.00279% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 12 November 2026
Last updated: 12 November 2026
Affected: activestorage
Weakness: CWE-200

CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

At the source

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