Vulnerability-Lookup up to 5.5.1 Remote-Instance Synchronization requests.get server-side request forgery

Summaryinfo

A vulnerability, which was classified as problematic, was found in Vulnerability-Lookup up to 5.5.1. Affected by this vulnerability is the function requests.get of the component Remote-Instance Synchronization. Such manipulation leads to server-side request forgery. This vulnerability is listed as CVE-2026-73432. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Vulnerability-Lookup up to 5.5.1 and classified as problematic. Affected by this issue is the function requests.get of the component Remote-Instance Synchronization. The manipulation with an unknown input leads to a server-side request forgery vulnerability. Using CWE to declare the problem leads to CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Vulnerability-Lookup contains a server-side request forgery (SSRF) vulnerability in the remote-instance synchronization functionality. Remote instance addresses were validated only for basic URL syntax before being stored, while the synchronization worker later dereferenced these addresses using requests.get() with automatic redirect handling and without enforcing network-boundary restrictions. An authenticated administrator with the admin:access permission could configure a remote instance whose address points to an internal, loopback, link-local, or cloud metadata HTTP(S) service. When synchronization is performed, the Vulnerability-Lookup server would issue the request from its own network context. An attacker could also use a publicly accessible URL that redirects to an internal destination, because redirects were previously followed without revalidating the destination. Successful exploitation could allow a privileged attacker to probe or interact with services that are accessible from the Vulnerability-Lookup server but not directly reachable by the attacker, including private network services or cloud instance metadata endpoints. The exact confidentiality, integrity, or availability impact depends on the services reachable from the application server. The patch introduces a shared outbound URL policy that restricts remote instances to HTTP(S), rejects non-public IP addresses, resolves hostnames at request time, and manually validates each redirect destination before following it. The implementation explicitly blocks private, loopback, link-local, multicast, reserved, and unspecified addresses.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-73432 since 08/12/2026. The exploitation is known to be easy. The attack may be launched remotely. Additional levels of successful authentication are necessary for exploitation. There are known technical details, but no exploit is available.

Applying the patch a3cf621c2583c45227a5b7880123ba0ffef3cc0f is able to eliminate this problem.

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Productinfo

Name

• Vulnerability-Lookup

Version

• 5.5.0
• 5.5.1

Website

• Product: https://github.com/vulnerability-lookup/vulnerability-lookup/

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