CVE-2026-70354: .NET Core Remote Code Execution Vulnerability
Out-of-bounds write in .NET allows an unauthorized attacker to execute code locally.
CSIRTS triage
- What
- Out-of-bounds write in .NET Core allows local remote code execution.
- Who is affected
- Systems with .NET Core deployed where untrusted local code execution is possible.
- Urgency
- High; CVSS 7.8 with local attack vector requiring no known exploitation; local privilege escalation risk.
- Action
- Update .NET Core to the patched version when available from Microsoft.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch .NET Core
Get an email when a new .NET Core advisory drops — max one per day, one-click unsubscribe.
Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70354
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-2026-703540.39% 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-2026-70354 | 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
- unknownMultiple vulnerabilities in Microsoft products (August 12, 2026)cert-fr-avis
- unknownNCSC-2026-0285 [1.00] [M/H] Vulnerabilities patched in Microsoft Developer Toolsncsc-nl
- highGHSA-gg8c-3338-xw2f: Microsoft Security Advisory CVE-2026-70354 – .NET Core Remote Code Execution Vulnerabilit…ghsa
- highCVE-2026-70354: Out-of-bounds write in .NET allows an unauthorized attacker to execute code locally.nvd
Recent advisories for .NET Core Remote
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.
More from Microsoft Security Response Center
- highCVE-2026-68792: Microsoft Office Elevation of Privilege Vulnerability2026-08-11
- highCVE-2026-66807: Microsoft Office Graphics Component Remote Code Execution Vulnerability2026-08-11
- highCVE-2026-64909: Microsoft Office Remote Code Execution Vulnerability2026-08-11
- highCVE-2026-70130: Microsoft Office Remote Code Execution Vulnerability2026-08-11
- mediumCVE-2026-62839: Microsoft SharePoint Server Spoofing Vulnerability2026-08-11