CVE-2026-82509

V Programming Language net.http TLS Certificate Validation Bypass

Published Nov 10, 2026 CVSS 4.0 · 9.1 Critical EPSS < 1% KEV · Not listed

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

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

vlang

unaffected

Version	Status	Constraints
`0`	affected	≤ 0.5.2
`https://github.com/vlang/v/commit/40774847a949722f`	unaffected	—

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.229% probability within 30 days)

Key SSVC decision points have not yet been added.

References

Link	Providers
https://github.com/vlang/v/commit/40774847a949722f5d090706c050b806ceeacfd1
https://github.com/vlang/v/security/advisories/GHSA-7g66-88pm-6gv6
https://www.vulncheck.com/advisories/v-programming-language-net-http-tls-certificate-validation-bypass

History

Nov 10, 2026 1:45 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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.
Title		V Programming Language net.http TLS Certificate Validation Bypass
Weaknesses		CWE-295
References		https://github.com/vlang/v/commit/40774847a949722f5d090706c050b806ceeacfd1 https://github.com/vlang/v/security/advisories/GHSA-7g66-88pm-6gv6 https://www.vulncheck.com/advisories/v-programming-language-net-http-tls-certificate-validation-bypass
Metrics		cvssV3_1 `{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'}` cvssV4_0 `{'score': 9.1, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}`