Vlang V up to 0.5.2 net/http http.get/http.post/http.fetch validate certificate validation

Summaryinfo

A vulnerability was found in Vlang V up to 0.5.2. It has been rated as problematic. This vulnerability affects the function http.get/http.post/http.fetch of the file net/http. Performing a manipulation of the argument validate results in certificate validation. This vulnerability is known as CVE-2026-82509. Remote exploitation of the attack is possible. No exploit is available. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability classified as problematic has been found in Vlang V up to 0.5.2. This affects the function http.get/http.post/http.fetch of the file net/http. The manipulation of the argument validate with an unknown input leads to a certificate validation vulnerability. CWE is classifying the issue as CWE-295. The product does not validate, or incorrectly validates, a certificate. This is going to have an impact on integrity. The summary by CVE is:

V programming language standard library net.http through version 0.5.2 prior to commit 4077484 contains a TLS certificate validation bypass vulnerability that allows on-path attackers to intercept HTTPS traffic by exploiting the default false value of SSLConnectConfig.validate and FetchConfig.validate, which completes TLS handshakes without verifying certificates in both the mbedtls and OpenSSL backends. Attackers can present an expired, self-signed, wrong-hostname, or untrusted-root certificate to successfully complete the handshake via http.get, http.post, or http.fetch, enabling interception or modification of HTTPS traffic unless validate: true is explicitly configured.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-82509 since 08/29/2026. The exploitability is told to be difficult. 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. The attack technique deployed by this issue is T1587.003 according to MITRE ATT&CK.

Applying the patch 4077484 is able to eliminate this problem.

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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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