Improper Certificate Validation Affecting erlang27 package, versions <0:27.3.4.19-0.1.hum1


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.36% (29th percentile)

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  • Snyk IDSNYK-RHEL10-ERLANG27-21273482
  • published20 Oct 2026
  • disclosed14 Oct 2026

Introduced: 14 Oct 2026

NewCVE-2026-105236  (opens in a new tab)
CWE-295  (opens in a new tab)

How to fix?

Upgrade RHEL:10 erlang27 to version 0:27.3.4.19-0.1.hum1 or higher.
This issue was patched in RHSA-2026:83217.

NVD Description

Note: Versions mentioned in the description apply only to the upstream erlang27 package and not the erlang27 package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

Improper Certificate Validation vulnerability in the ssl application in Erlang/OTP allows a client that holds a certificate trusted by one SNI virtual host to authenticate to a second SNI virtual host on the same listener by resuming its TLS 1.2 session there.

A server that serves several SNI names from one listen socket through sni_fun or sni_hosts keeps one pre-TLS 1.3 session cache per listener and does not bind a cached session to the SNI name or client trust policy that established it. When an SNI option set switches to verify_peer without naming reuse_sessions, ssl_config:update_options/3 inherits the base listener's reuse_sessions value of true, so the default that disables reuse for client-authenticating servers does not apply. On an abbreviated handshake ssl_session:is_resumable/4 checks only that the cached session uses one of the current server certificates and carries some peer certificate, and never revalidates that certificate against the CA selected for the requested name. The names must share a server certificate, which is common with wildcard or multi-SAN certificates. TLS 1.3 does not use this cache and is not affected.

This issue affects OTP from OTP 18.0 before OTP 27.3.4.19, OTP 28.5.0.8, and OTP 29.1.2, corresponding to ssl from 7.0 before 11.2.12.14, 11.6.0.7, and 11.7.8.

CVSS Base Scores

version 3.1