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CVE-2026-82509VulnerabilityPublished

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

Source GCVE Database

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Authoritative record:CVE-2026-82509· Critical 9.1

Not known to be exploited · CVSS 9.1 Critical.

Data as of 10 Nov 2026, 16:37 UTC

CVSS 4.0 base score
9.1Critical
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (VulnCheck)CVSS 4.09.1
CNA (VulnCheck)CVSS 3.17.4
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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
vlangAffected
  • <=0.5.2
Fixed in–
GitHubvlang/vpkg:github/vlang/vOther threatsAffected
  • <=0.5.2
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Users should explicitly configure SSLConnectConfig.validate and FetchConfig.validate to true to enforce certificate validation and prevent TLS handshake completion with invalid certificates. Monitor the vendor's repository or advisory for any official fixes or updates.

Description

The V programming language standard library net.http up to version 0.5.2 contains a TLS certificate validation bypass vulnerability. This flaw arises because the default configuration for SSLConnectConfig.validate and FetchConfig.validate is false, causing TLS handshakes to complete without verifying certificates in both mbedtls and OpenSSL backends. As a result, attackers can intercept or modify HTTPS traffic by presenting invalid certificates such as expired, self-signed, wrong-hostname, or untrusted-root certificates unless the validate option is explicitly set to true.

References

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