CVE-2026-88647: GNUTLS GNUTLS vulnerability

Published Oct 8, 2026

Updated

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.

Affected Software

1 affected component

GNUTLS GNUTLS=3.8.13

Event History

Oct 8, 2026

CVE Published

via MITRE·12:00 AM

Data Sourced

via MITRE·12:00 AM

Description

Frequently Asked Questions

What does an attacker need to exploit this issue?

An attacker needs to present a crafted certificate in a position where they can eavesdrop on or intercept the affected TLS communications.

What type of traffic is at risk?

TLS communications using GnuTLS 3.8.13 are at risk when hostname verification relies on the Common Name fallback mechanism.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co

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