CVE-2026-33483

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{"affected": [{"affectedData": [{"product": "AVideo", "vendor": "WWBN", "versions": [{"status": "affected", "version": "<= 26.0"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:*", "matchCriteriaId": "774C24F1-9D26-484F-B931-1DA107C8F588", "versionEndIncluding": "26.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "WWBN AVideo is an open source video platform. In versions up to and including 26.0, 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. Commit 33d1bae6c731ef1682fcdc47b428313be073a5d1 contains a patch."}, {"lang": "es", "value": "WWBN AVideo es una plataforma de video de c\u00f3digo abierto. En versiones hasta la 26.0 inclusive, el endpoint 'aVideoEncoderChunk.json.php' es un script PHP completamente aut\u00f3nomo sin autenticaci\u00f3n, sin inclusiones de framework y sin l\u00edmites de recursos. Un atacante remoto no autenticado puede enviar datos POST arbitrarios que se escriben en archivos temporales persistentes en '/tmp/' sin l\u00edmite de tama\u00f1o, sin limitaci\u00f3n de velocidad y sin mecanismo de limpieza. Esto permite un agotamiento trivial del espacio en disco lo que lleva a la denegaci\u00f3n de servicio de todo el servidor. El commit 33d1bae6c731ef1682fcdc47b428313be073a5d1 contiene un parche."}], "id": "CVE-2026-33483", "lastModified": "2026-06-17T10:37:34.590", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-33483", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-24T17:41:01.773424Z", "version": "2.0.3"}}]}, "published": "2026-03-23T15:16:34.717", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/WWBN/AVideo/commit/33d1bae6c731ef1682fcdc47b428313be073a5d1"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/WWBN/AVideo/security/advisories/GHSA-vv7w-qf5c-734w"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,26.0]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "AVideo", "source": "cna", "vendor": "WWBN"}, "product": "avideo", "vendor": "wwbn"}], "analysis": {"en": {"generated_at": "2026-03-24T19:29:07.854744+00:00", "value": {"mitigation_remediation": ["Update AVideo to a version newer than 26.0 or apply the patch in commit 33d1bae6c731ef1682fcdc47b428313be073a5d1.", "If upgrading is not immediately possible, restrict write access or set disk quotas on /tmp to limit the impact of temporary files.", "Monitor disk usage on the server, especially /tmp, to detect abnormal growth early.", "Verify that the aVideoEncoderChunk.json.php endpoint is no longer accessible without authentication."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "WWBN AVideo, an open\u2011source video platform, is impacted. Versions up to and including 26.0 contain the vulnerable script. All installations running these versions that expose the endpoint to external traffic are at risk.", "description_and_impact": "An unauthenticated remote attacker can send arbitrary POST data to the aVideoEncoderChunk.json.php endpoint, which writes the data to temporary files in /tmp without a size limit or cleanup, quickly consuming disk space and causing a denial of service that impacts the entire server. The weakness is classified as CWE-770, indicating uncontrolled resource consumption.", "risk_and_exploitability": "The CVSS score of 7.5 classifies the issue as high severity, while the EPSS score is below 1%, suggesting a low current exploitation probability. The vulnerability is not listed in the CISA KEV catalog. Attackers can exploit it by sending unauthenticated POST requests to the exposed endpoint, creating unlimited temporary files; no special privileges or authentication are required, making it trivial to trigger once the script is reachable over the network."}}}}, "created": "2026-03-24T10:33:45.824517+00:00", "updated": "2026-03-25T21:28:01.502849+00:00", "vendors": ["wwbn", "wwbn$PRODUCT$avideo"]}