OCTOBER 9, 2026
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Case File

CVE-2026-89136

HIGH · CVSS 8.3 EPSS 0.55% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-09-27 · Last synced 2026-10-09

CyberRota Analysis

AI-Generated

The vulnerability allows a malicious server to bypass authentication in TLS 1.2, 1.3, and DTLS 1.2 connections when Raw Public Key (RPK) is enabled. This could lead to unauthorized access and potential data breaches. Organizations utilizing RPK in their configurations should prioritize addressing this issue to mitigate the risk of exploitation.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-89136
Severity
HIGH
CVSS
8.3
EPSS
0.55%

Original NVD Description

When using RPK (Raw Public Key), the client side of a TLS 1.2, 1.3 and DTLS 1.2 connection could accept an unsolicited server_cert_type=RawPublicKey which allowed a malicious or misbehaving server to bypass authentication. RPK is off by default and only enabled in --enable-rpk OR --enable-all OR --enable-distro AKA HAVE_RPK builds.