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AVideo CVE-2026-81678

| EUVDEUVD-2026-67034 MEDIUM
Server-Side Request Forgery (SSRF) (CWE-918)
2026-08-27 VulnCheck GHSA-pmq2-hv69-w45g
SSRF Avideo
6.9
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.9 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L/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
vuln.today AI
7.2 HIGH

Network vector, no privileges or interaction required; scope changes because the server fetches attacker-chosen internal endpoints, yielding low confidentiality and integrity impact on subsequent systems.

3.1 AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 27, 2026 - 18:15 vuln.today
Patch available
Aug 27, 2026 - 18:02 EUVD

DescriptionCVE.org

AVideo before 24.0 contains a server-side request forgery vulnerability in the isSSRFSafeURL function that fails to extract embedded IPv4 addresses from NAT64, 6to4, and Teredo IPv6 transition address formats. Unauthenticated attackers can bypass SSRF protections via the LiveLinks proxy endpoint to reach internal services and cloud metadata endpoints by encoding private IPv4 targets in transition address formats.

AnalysisAI

Server-side request forgery in AVideo before 24.0 allows unauthenticated network attackers to bypass SSRF protections in the isSSRFSafeURL function by encoding private IPv4 targets inside NAT64, 6to4, or Teredo IPv6 transition address formats. The LiveLinks proxy endpoint serves as the attack surface, enabling requests to reach internal network services and cloud instance metadata endpoints (e.g., 169.254.169.254 equivalents) that should be unreachable. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify publicly accessible AVideo LiveLinks proxy endpoint
Delivery
Encode private IPv4 target inside NAT64/6to4/Teredo IPv6 address
Exploit
Submit crafted URL to proxy unauthenticated
Execution
SSRF guard approves IPv6 address without decoding embedded IPv4
Persist
AVideo server fetches internal or metadata endpoint
Impact
Attacker receives internal service response
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Vulnerability AssessmentAI

Exploitation Exploitation requires that the AVideo instance be reachable over the network and that the LiveLinks proxy feature be operational (it appears to be a standard component, not a non-default option, based on the description). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 6.9 reflects an unauthenticated, low-complexity network attack with no user interaction required (AV:N/AC:L/AT:N/PR:N/UI:N), which correctly captures the ease of exploitation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An unauthenticated attacker sends an HTTP request to the AVideo LiveLinks proxy endpoint specifying a destination URL encoded as a NAT64 IPv6 address (e.g., 64:ff9b::a9fe:a9fe representing 169.254.169.254). The isSSRFSafeURL guard evaluates the address as a legitimate IPv6 address, bypasses the private-range blocklist, and the AVideo server fetches the cloud metadata endpoint, returning the response - potentially including IAM role credentials - to the attacker. …
Remediation The primary fix is to upgrade AVideo to version 24.0 or later, which contains the vendor-released patch per the GitHub security advisory at https://github.com/WWBN/AVideo/security/advisories/GHSA-474r-333v-6p93. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-81678 vulnerability details – vuln.today
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