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 Microsoft Visual Studio 2022 version 17.12

Linked CVEs: 2
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.

2 of 2 linked CVEs shown

Confirmed exploitedCVSS above 9.0

CVE and description	Severity	Exploit reality	Forecast and access	Remediation
CVE-2026-32203 Scheduled assessment .NET and Visual Studio Denial of Service Vulnerability A flaw was found in .NET. A remote attacker could exploit a stack overflow vulnerability during encrypted key nested decryption, leading to a Denial of Service (DoS). This could make the affected system unavailable to legitimate users.	7.5 · CVSS 3.1 · HighSource: CNA	No 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: 2.44% · 83.8th percentileForecast date: 2026-10-07NETWORK · LOW complexity · NONE privileges · NONE user interaction	Within 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)
CVE-2026-32178 Scheduled assessment .NET Spoofing Vulnerability A flaw was found in the .NET runtime (System.Net.Mail) in how email address data is parsed. Improper neutralization of special characters, specifically carriage return and line feed (CR/LF) sequences, may allow specially crafted email address input to be interpreted incorrectly. An attacker could exploit this issue to perform email spoofing by injecting additional headers or altering how the email address is processe	7.5 · CVSS 3.1 · HighSource: CNA	No 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: 2.09% · 81.1th percentileForecast date: 2026-10-07NETWORK · LOW complexity · NONE privileges · NONE user interaction	Within 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)