Code execution
Windows DNS Remote Code Execution Vulnerability
At a glance
Low rather than Medium: UK relevance is 40 of 100, little UK-specific signal so far.
Briefing
There is no written leader briefing for this story yet. These questions come from the facts we hold.
Questions to ask IT
- Are we affected by CVE-2026-109463, and which of our systems would be?
- If it is not yet patched, what mitigation is in place, and will the fix be done by 10 Dec?
Next steps
- Confirm whether this affects systems or suppliers in your estate
Vulnerability facts
Full CVE detail CVE-2026-109463- 8.8 · HighExploitable over the network without any account, but only if a user takes an action, such as opening a file or link. High impact on confidentiality, integrity and availability.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Not listed
- Not linked from the CVE record
No technical write-up beyond these facts and the summary below yet.
Next steps
- Review the advisory against your asset inventory and patch cadence
Summary
- Deserialisation of untrusted data in Windows DNS allows an unauthorised attacker to execute code over a network.
Read the original reportMicrosoft Security Update Guide RSS(opens in a new tab)
Pulse
Last change 59m ago · Next recheck 11 Nov 2026, 19:03 UK time
- Story10 Nov 2026, 19:03 UK time · 59m ago
Linked reporting from Microsoft Security Update Guide RSS (vendor psirt).
Read source (Microsoft Security Update Guide RSS)
1 entry so far. The timeline chart appears once this story has more history.
Sources
CVE-2026-109463 Windows DNS Remote Code Execution Vulnerability
How we know
Statements extracted from sources. Higher confidence means stronger corroboration.
- ClaimedHeadline60% confidence
Windows DNS Remote Code Execution Vulnerability
- ProbableSummary fact75% confidence
Deserialization of untrusted data in Windows DNS allows an unauthorised attacker to execute code over a network.
- ConfirmedCVE identifier95% confidence
Event involves CVE-2026-109463