SB20261007205 - IBM PowerVC update for Erlang OTP

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Main Vulnerability Database SB20261007205

SB20261007205 - IBM PowerVC update for Erlang OTP

Published: October 7, 2026

Security Bulletin ID SB20261007205
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper validation of certificate with host mismatch (CVE-ID: CVE-2026-42790)

CWE-ID: CWE-297 - Improper Validation of Certificate with Host Mismatch

CVSSv4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to bypass certificate hostname validation.

The vulnerability exists due to improper validation of certificate with host mismatch in public_key:pkix_verify_hostname/3 when processing TLS certificates that lack a Subject Alternative Name extension or contain no domain name in that extension. A remote attacker can present a specially crafted certificate during a man-in-the-middle position to bypass certificate hostname validation.

Exploitation requires the ability to intercept network traffic and, in the worst case, control a DNS-constrained sub-CA key.


Remediation

Install update from vendor's website.

References