AVideo Affected by Unauthenticated Disk Space Exhaustion via Unlimited Temp File Creation in aVideoEncoderChunk.json.php

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2026-33483: 0.62% estimated exploitation activity in the next 30 days; percentile 49.55 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The aVideoEncoderChunk.json.php endpoint is a completely standalone PHP script with no authentication, no framework includes, and no resource limits. An unauthenticated remote attacker can send arbitrary POST data which is written to persistent temp files in /tmp/ with no size cap, no rate limiting, and no cleanup mechanism. This allows trivial disk space exhaustion leading to denial of service of the entire server. Details The file objects/aVideoEncoderChunk.json.php (25 lines total) operates entirely outside the AVideo framework: The vulnerability chain: 1. No authentication: The script includes no session handling, no requireonce of the framework, no useVideoHashOrLogin(), no canUpload() — nothing. Compare with aVideoEncoder.json.php which includes configuration.php and calls authentication functions. 2. No size limits: php://input is read until exhaustion. The effective limit is PHP's postmaxsize, which AVideo's .htaccess has commented-out settings for 4GB (#phpvalue…

Published by the source

20 Mar 2026, 20:46 UTC

Last modified by the source

25 Mar 2026, 18:49 UTC

Source last checked

26 Oct 2026, 14:39 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-vv7w-qf5c-734w

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# Patch Next advisory brief: CVE-2026-33483

Advisory: AVideo Affected by Unauthenticated Disk Space Exhaustion via Unlimited Temp File Creation in aVideoEncoderChunk.json.php
IDs: CVE-2026-33483, GHSA-vv7w-qf5c-734w
Record: https://patchnext.com/advisories/cve-2026-33483 (revision 1, source checked 26 Oct 2026, 14:39 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist wwbn/avideo: affected <= 26.0

## Suggested inspection (read-only)
- Packagist wwbn/avideo: check the installed version with your package manager.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on wwbn/avideo.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-vv7w-qf5c-734w (GitHub-reviewed advisory GHSA-vv7w-qf5c-734w lists affected ranges: Packagist wwbn/avideo >=0 <=26.0)

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