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April 2026 Patch TuesdayMSRC-2026-04-developer-tools-release-notesNormal patch window

Microsoft · MSRC-2026-04-developer-tools-release-notes

Linked CVE review

Deploy Microsoft Developer Tools update for PowerShell 7.6

Linked CVEs
1
Confirmed exploited
0
PoC or lab evidence
0
Maximum CVSS
7.5
Evidence is kept separate

Confirmed exploitation, public exploit material, EPSS probability and CVSS severity answer different questions. “No confirmation recorded” means the checked sources do not currently confirm exploitation. It is not proof that exploitation has not occurred.

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1 of 1 linked CVEs shown
Confirmed exploitedCVSS above 9.0
CVE and descriptionSeverityExploit realityForecast and accessRemediation
CVE-2026-26171 Scheduled assessment
.NET Denial of Service Vulnerability

A flaw was found in .NET. A remote attacker could exploit a vulnerability related to unsafe transforms in EncryptedXml. This could lead to a Denial of Service (DoS), making the service unavailable, and a bypass of security features.

7.5 · CVSS 3.1 · HighSource: CNANo confirmation recordedNo CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.None recordedNo exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.EPSS: 2.26% · 82.5th percentileForecast date: 2026-10-07NETWORK · LOW complexity · NONE privileges · NONE user interactionWithin 7 daysHigh technical severity; prioritise exposed affected systems while verifying vendor guidance.Patch available. RHSA-2026:13281: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)