Unauthenticated file write via encoder chunk endpoint
Published Aug 11, 2026 · Updated Aug 11, 2026
Arbitrary file write in AVideo 29.0 allows remote attackers to write attacker-controlled content to temporary server files through HTTP PUT. The standalone objects/aVideoEncoderChunk.json.php endpoint reads php://input and writes it under /tmp/YTPChunk_ plus the hexadecimal file_id without loading AVideo's authentication framework. No credentials, user interaction, or non-default configuration are required; repeated requests can exhaust disk space or poison queued encoding data, while code execution requires a separate local file inclusion flaw.
Summary
What happened
Arbitrary file write in AVideo 29.0 allows remote attackers to write attacker-controlled content to temporary server files through HTTP PUT. The standalone objects/aVideoEncoderChunk.json.php endpoint reads php://input and writes it under /tmp/YTPChunk_ plus the hexadecimal file_id without loading AVideo's authentication framework. No credentials, user interaction, or non-default configuration are required; repeated requests can exhaust disk space or poison queued encoding data, while code execution requires a separate local file inclusion flaw.
The record
- CVE
- CVE-2026-72748
- Published
- Aug 11, 2026
- Updated
- Aug 11, 2026
- Vendor
- WWBN
- Product
- AVideo
- Classifications
- CWE-306, T1190, T1499.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 11, 2026CVE publishedPublication date reported by the CVE source.
- Aug 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=29.0
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
Public exploit references
- GHSA-v7p7-jccx-h37c proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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