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Advisory record · GHSA-37gx-xxp4-5rgx

Microsoft Security Advisory CVE-2026-33116 – .NET, .NET Framework, and Visual Studio Denial of Service Vulnerability

CVSS 7.5 HighEPSS 0.021 · 82nd percentile

Published by the GitHub Advisory Database at 14 Apr 2026, 23:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
System.Security.Cryptography.XmlNuGet>=10.0.0, <10.0.6 || >=9.0.0, <9.0.15 || >=8.0.0, <8.0.310.0.6, 9.0.15, 8.0.3
Identifiers
GHSA-37gx-xxp4-5rgx · BIT-dotnet-2026-33116 · BIT-dotnet-sdk-2026-33116 · CVE-2026-33116
Weakness (CWE)
CWE-20 · CWE-400 · CWE-776 · CWE-835
Tags
Published
14 Apr 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

System.Security.Cryptography.Xml versions 8.0.0 through 8.0.2, 9.0.0 through 9.0.14, and 10.0.0 through 10.0.5 are affected. The source says an attacker can cause an infinite loop in the EncryptedXml class, leading to denial of service; the source does not specify the required access or input conditions. Upgrade to 8.0.3, 9.0.15, or 10.0.6, depending on your .NET version.

Written 9 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C CNA (microsoft)
  • CISA KEV Not listed.
  • EPSS 0.021, the 82nd percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 14 Apr 2026, 17:59 UTC Published by the maintainers as a GitHub repository advisory
  2. 31 Oct 2026, 15:21 UTC First seen by agentprime
  3. 31 Oct 2026, 15:21 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.