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CVE-2026-5188VulnerabilityPublished Updated

X.509 SAN parsing · Integer Underflow

Affects MicrosoftSource GCVE Database

0

Not known to be exploited.

Data as of 27 Oct 2026, 00:13 UTC

Severity
Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 2 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Microsoft Security Response Center MicrosoftAffected
  • =3.0
  • =2.0
  • >=2.0 <=3.0
Fixed in–

AI-suggested

Users should monitor vendor advisories for updates and apply patches once released.

Description

An integer underflow vulnerability exists in the X.509 Subject Alternative Name (SAN) parsing functionality of wolfSSL. This flaw could potentially lead to incorrect processing of certificate data. The vulnerability is identified as CVE-2026-5188 and affects wolfSSL versions 2.0 and 3.0. No CVSS score or detailed impact information is provided, and there is no indication of active exploitation in the wild. No patch or remediation details are available from the vendor at this time.

References

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