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CVE-2026-31430VulnerabilityPublished Updated

Microsoft · X.509: Fix out-of-bounds access when parsing extensions

Affects MicrosoftSource GCVE Database

0

Not known to be exploited.

Data as of 27 Oct 2026, 00:40 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
Fixed in–

Description

A vulnerability identified as CVE-2026-31430 involves an out-of-bounds access issue when parsing X.509 certificate extensions in Microsoft software version 3.0. This flaw could potentially lead to memory corruption or crashes during certificate processing.

References

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