---
id: CVE-2026-88647
title: >-
  A hostname verification bypass in GnuTLS v3.8.13 allows attackers to
  circumvent the Common Name fallback mechanism and eavesdrop on communications
  via a crafted certificate.
summary: >-
  A hostname verification bypass in GnuTLS v3.8.13 allows attackers to
  circumvent the Common Name fallback mechanism and eavesdrop on communications
  via a crafted certificate.
severity: none
published: '2026-10-08'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T21:33:42.423'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-88647'
references:
  - url: 'https://gist.github.com/lkloliver/f98ec3de1a871fdfc02b70b8b9ba7642'
    label: cve@mitre.org
  - url: 'https://gitlab.com/gnutls/gnutls/-/issues/1802'
    label: cve@mitre.org
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-08T16:52:14.786Z'
---

## Overview

A hostname verification bypass in GnuTLS v3.8.13 allows attackers to circumvent the Common Name fallback mechanism and eavesdrop on communications via a crafted certificate.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.