VULNERABILITY INTELLIGENCE

CVE-2026-5188

CVSS score8.1 HIGH
EPSS probability0.14%
CISA KEVNot currently listed
Published2026-04-10
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

Description

An integer underflow issue exists in wolfSSL when parsing the Subject Alternative Name (SAN) extension of X.509 certificates. A malformed certificate can specify an entry length larger than the enclosing sequence, causing the internal length counter to wrap during parsing. This results in incorrect handling of certificate data. The issue is limited to configurations using the original ASN.1 parsing implementation which is off by default.

Weakness classification

  • facts@wolfssl.com: CWE-191

Primary references