What is CVE-2026-69858?
Use after free in Windows DNS allows an unauthorized attacker to execute code over a network.
The record classifies CVE-2026-69858 under weakness class CWE-416. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 3 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 52 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 8.1 — HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - EPSS (FIRST)
- 0.7% probability of exploitation in the next 30 days, higher than 52.0% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 6.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-09-08, last modified 2026-10-08
Is CVE-2026-69858 being exploited?
It currently carries a trending score of 40 in the Threadlinqs vulnerability feed.
Affected products and versions
- Microsoft: Windows Server 2022, Windows Server 2025, Windows Server 2025 (Server Core installation)
How to fix CVE-2026-69858
The record marks a vendor fix as available for CVE-2026-69858. Patch reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69858. Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69858. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2026-69858
1 tracked threat in the Threadlinqs corpus references CVE-2026-69858, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.