vlang v up to 0.5.2 URL Authority Section Parser net.urllib.parse/net.http.get server-side request forgery

Summaryinfo

A vulnerability classified as critical has been found in vlang v up to 0.5.2. This affects the function net.urllib.parse/net.http.get of the component URL Authority Section Parser. Performing a manipulation results in server-side request forgery. This vulnerability was named CVE-2026-67201. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in vlang v up to 0.5.2. It has been classified as critical. This affects the function net.urllib.parse/net.http.get of the component URL Authority Section Parser. The manipulation with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

V through 0.5.2, fixed in commit 85859f0, contains a server-side request forgery (SSRF) bypass vulnerability that allows attackers to circumvent host-based allowlists by exploiting a parser differential between net.urllib and net.http. Attackers can craft a URL containing a backslash in the authority section such that net.urllib.parse() extracts the trusted host for allowlist validation while net.http.get() normalizes the backslash and connects to the internal host, enabling access to internal network services that the allowlist was intended to block.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-67201 since 07/28/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Applying the patch 85859f0f3498d4091b38009c45ed390a97eeedc2 is able to eliminate this problem.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• vlang

Name

• v

Version

• 0.5.0
• 0.5.1
• 0.5.2

Website

• Product: https://github.com/vlang/v/

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