Skip to content
OpenAdvisories
Critical · 9.1 CVE-2026-82509 EUVD-2026-121044GHSA-35rr-q46f-rh89

V programming language standard library net.http through version 0.5.2 prior to commit 4077484 contains a TLS certificate validation bypass…

Published Nov 10, 2026 · Updated Nov 10, 2026 · Assigned by VulnCheck

Description

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.

Affected products

VendorProductAffectedFixed
vlang v 0 ≤0.5.2 —

References