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Vulnerabilities

Vulnerability · CVE-2026-108399

CVE-2026-108399 is listed by Microsoft Patch Tuesday for October 2026 — Snort rules and prominent vulnerabilities.

Published Oct 13, 2026 · Cisco Talos

Check if you run it

No confirmed exploitation is on record for CVE-2026-108399. EPSS is 0.34%. Act only if a listed version of Cisco Talos is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.34%
Remediation
Not established
Affected products
Cisco Talos

CVE-2026-108399 is listed by Microsoft Patch Tuesday for October 2026 — Snort rules and prominent vulnerabilities.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-108399

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-108399. EPSS is 0.34%. Act only if a listed version of Cisco Talos is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.34%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · Cisco Talos

    Detected

    CVE-2026-108399 is listed by Microsoft Patch Tuesday for October 2026 — Snort rules and prominent vulnerabilities.

Sources

  • CVE.orgVulnerability recordCVE-2026-108399

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-108399

    30-day exploitation probability 0.3%

    first.org
  • Cisco TalosVendor advisoryCVE-2026-108399

    Microsoft has released its monthly security update for October 2026, which includes 1415 vulnerabilities affecting a range of products, including 85 that Microsoft marked as "critical."

    blog.talosintelligence.com

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.