CVE-2026-58641: .NET Elevation of Privilege Vulnerability

highCVSS 7.8CVE-2026-58641

Integer overflow or wraparound in .NET allows an unauthorized attacker to elevate privileges locally.

CSIRTS triage

vendor: Microsoft product: .NET Privilege escalation Memory corruption

What: Integer overflow or wraparound in .NET allows an unauthorized attacker to elevate privileges locally.
Who is affected: Systems running .NET with local user access.
Urgency: High severity (CVSS 7.8); local privilege escalation via memory corruption requires urgent patching.
Action: Apply .NET security updates from Microsoft addressing CVE-2026-58641.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.8
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58641

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-586410.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 32% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-58641	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[NEW] [high] Microsoft Developer Tools: Multiple Vulnerabilitiescert-bund
unknownMultiple vulnerabilities in Microsoft .Net (August 12, 2026)cert-fr-avis
unknownNCSC-2026-0285 [1.00] [M/H] Vulnerabilities patched in Microsoft Developer Toolsncsc-nl
highCVE-2026-58641: Integer overflow or wraparound in .NET allows an unauthorized attacker to elevate privileges l…nvd

Recent advisories for .NET Elevation of

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highGHSA-vg44-h755-9hw7: Microsoft Security Advisory CVE-2026-62871 – .NET Elevation of Privilege Vulnerabilityghsa · 2026-08-11
mediumGHSA-9mr8-pwpw-3j2w: Microsoft Security Advisory CVE-2026-62909 – .NET Elevation of Privilege Vulnerabilityghsa · 2026-08-11
highGHSA-jqhp-238x-qhgf: Microsoft Security Advisory CVE-2026-62886 – .NET Elevation of Privilege Vulnerabilityghsa · 2026-08-11
highCVE-2026-65810: Relative path traversal in .NET Framework allows an unauthorized attacker to elevate privilege…nvd · 2026-08-11
highCVE-2026-62909: Uncaught exception in .NET allows an authorized attacker to elevate privileges locally.nvd · 2026-08-11
highCVE-2026-62886: Integer overflow or wraparound in .NET allows an unauthorized attacker to elevate privileges l…nvd · 2026-08-11