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VULNERABILITIES

CVE-2026-5188 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8.1 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/wolfSSL/wolfssl/pull/10024 [email protected]Issue TrackingPatch

Weakness Enumeration

CWE-IDCWE NameSource
CWE-191Integer Underflow (Wrap or Wraparound)[email protected]

Affected Products

ProductVersions
wolfssl wolfssl
< 5.9.1

CPE

  • cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

4 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-5188
NVD Published Date:
Apr 10, 2026
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2026-5188 Details - Not Deferred