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CVE-2026-69186VulnerabilityPublished Updated

Microsoft · c-ares: Memory-amplification denial of service via unvalidated DNS header record counts

Affects MicrosoftSource GCVE Database

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Not known to be exploited.

Data as of 6 Nov 2026, 11:23 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

EPSS
0.4% chance of exploitation in 30 days – higher than 40% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 20 Sep 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 6 Nov 2026.

What to do

Affected software

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

Description

CVE-2026-69186 is a vulnerability in c-ares version 3.0 involving a memory-amplification denial of service caused by unvalidated DNS header record counts. This flaw can lead to resource exhaustion when processing malformed DNS responses.

References

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