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EVULNABLE
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CVE-2026-96959

Microsoft — .NET Denial of Service Vulnerability

Patch Tuesday

Patch Tuesday

What EVULNABLE says

An EPSS probability of 0.008, and CVSS base score 7.5.

  • CISA KEV: did not apply
  • Ransomware: did not apply
  • Vendor exploitation: did not apply
  • EPSS: applied
  • Microsoft Exploitability Index: did not apply
  • Pre-patch disclosure: did not apply
  • KEV recency: did not apply
  • CVSS: applied

Scheduled Maintenance

The priority band answers “how soon”, not “how bad” — see Methodology for what it weighs and where it abstains.

The evidence behind it

MeasureValueSourceWhat it means
CVSS base score 7.5 — How severe the flaw is in itself. It does not say how likely an attack is.
FIRST EPSS 0.008 (54.6th pctl) FIRST FIRST's estimate of the chance this is exploited in the next 30 days, and how that ranks against all CVEs.
Actively exploited Not confirmed Patch Tuesday Whether a source of record has confirmed attacks using it in the wild.
Fixed in System.Security.Cryptography.Xml: 10.0.13, 11.0.0-rc.2, 8.0.5, 9.0.21 NVD The version(s) the vendor has published as fixed, where NVD records one.
Public exploit module None known Metasploit Module existing is not the same as active exploitation.
EUVD cross-reference Listed ENISA EUVD ENISA's own vulnerability database entry for this CVE, where one exists.

Impacted software or hardware: Not identified by the connected sources

Fixed versions: System.Security.Cryptography.Xml: 10.0.13, 11.0.0-rc.2, 8.0.5, 9.0.21

Remediation: Apply the vendor patch or guidance: https://github.com/advisories/GHSA-c399-9853-6jmj | https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96959

Remediation basis: External remediation intelligence

ENISA EUVD also lists this CVE at CVSS 7.5 (v3.1), assigned by microsoft. Source: euvd.enisa.europa.eu.

GitHub Advisory Database, GHSA-c399-9853-6jmj, lists affected packages:

  • System.Security.Cryptography.Xml (nuget) affected >= 10.0.0, <= 10.0.12, fixed in 10.0.13; affected >= 11.0.0-preview.1, <= 11.0.0-rc.1, fixed in 11.0.0-rc.2; affected >= 8.0.0, <= 8.0.4, fixed in 8.0.5; affected >= 9.0.0, <= 9.0.20, fixed in 9.0.21

Advisory data from GitHub, CC-BY-4.0.

2 days recorded, 2026-10-14 to 2026-10-15

0.77% as of 2026-10-15 (54.6th percentile). FIRST EPSS, recorded daily since this page started tracking it.

2026-10-14 2026-10-15

The primary records

This page is an opinion about urgency. Where it and a source of record disagree, the source of record is the record.

NVD ↗ Microsoft ↗

Where this sits

CVE-2026-96959 is one of the entries ranked on the priority feed and in this month's Microsoft release.