EUVD-2026-56138
GHSA-q6c7-vm4c-28mj
Severity by source
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Endpoint is network-reachable via HTTP with no authentication (AV:N/PR:N/AC:L); arbitrary file write drives high integrity impact and disk exhaustion drives high availability impact, with no direct confidentiality exposure.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
AVideo contains an unauthenticated arbitrary file write vulnerability in the aVideoEncoderChunk.json.php endpoint that allows remote attackers to write up to 4 GB of arbitrary content to the server filesystem via HTTP PUT requests without authentication. Attackers can exhaust disk space causing denial of service, poison the video encoding pipeline, or chain this with local file inclusion to achieve remote code execution.
AnalysisAI
Unauthenticated arbitrary file write in AVideo's aVideoEncoderChunk.json.php endpoint allows remote attackers to write up to 4 GB of arbitrary content to the server filesystem via HTTP PUT requests, requiring no credentials of any kind. All AVideo versions (cpe:2.3:a:wwbn:avideo:*:*:*:*:*:*:*:*) with this endpoint network-exposed are affected, as confirmed by the patch commit diff which shows authentication gating was entirely absent prior to the fix. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The endpoint objects/aVideoEncoderChunk.json.php must be reachable from the attacker's network position over HTTP or HTTPS - no special network position, VPN, or adjacent-network access is required for a publicly exposed instance. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 4.0 vector (AV:L/VI:N/VC:H) is materially inconsistent with the vulnerability as described and must not be used as-is for prioritization decisions. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the upstream fix at commit 1b55a9b3c4911d2f31594ce2e60566c70c6b95e8 (https://github.com/WWBN/AVideo/commit/1b55a9b3c4911d2f31594ce2e60566c70c6b95e8); note that a specific patched release version number is not confirmed from available data - this is a commit-level fix, and operators should verify whether a tagged release incorporating it has been published. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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