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CVE-2026-28389VulnerabilityPublished Updated

Microsoft · Possible NULL Dereference When Processing CMS KeyAgreeRecipientInfo

Affects MicrosoftSource GCVE Database

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Not known to be exploited.

Data as of 30 Oct 2026, 06:59 UTC

Severity
Medium

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

EPSS
0.8% chance of exploitation in 30 days – higher than 56% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: 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 29 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Microsoft Security Response Center MicrosoftAffected
  • =3.0
  • =2.0
  • Microsoft
  • Azure Linux
  • 3.0
  • Azure Linux 3.0
  • 2.0
Fixed in–

AI-suggested

In the absence of official fixes or advisories, monitor for updates from Microsoft Security Response Center.

Description

CVE-2026-28389 is a vulnerability in Microsoft products, including Azure Linux versions 2.0 and 3.0, involving a possible NULL pointer dereference when processing CMS KeyAgreeRecipientInfo. This flaw can cause application crashes or denial of service. There is no CVSS score or detailed vendor advisory available, and no known exploits in the wild. No specific geographic targeting is indicated.

References

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