Type Vulnerability
Updated the Security Updates table to add KB article links for.NET 11.0.
Microsoft
Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network
CVE-2026-69651
What this means
This is rated high severity (7.5 out of 10). There is no confirmed exploitation of it yet. Ask IT whether the affected products are in your estate.
Full vendor description
Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.
Scoring and exploitation
7.5/ 10
CVSS 3.1 base scoreHigh
Exploitable over the network without any account, and no one has to click or open anything. High impact on availability.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitability
Longer bar: easier to attack
Attack vectorNetworkAV:N
Attack complexityLowAC:L
Privileges requiredNonePR:N
User interactionNoneUI:N
ScopeUnchangedS:U
Impact
Longer bar: more harm
ConfidentialityNoneC:N
IntegrityNoneI:N
AvailabilityHighA:H
- ~1.3% estimated chance of attack in 30 daysModel estimate (): a probability signal, not confirmed exploitation
- Exploited in the wild
- Not confirmed in the
- Not reported
Weaknesses
CWE-407
References
1 link from the CVE record, grouped by site.
msrc.microsoft.com1 link