X.509 SAN parsing · Integer Underflow
Affects MicrosoftSource GCVE Database
Not known to be exploited.
Data as of 27 Oct 2026, 00:13 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Exploitation evidence
Disclosed: evidence found.
CVE published 2 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft Security Response Center Microsoft | Affected
| 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.