Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Microsoft.NetCore.App.Runtime packages for .NET 9.0 (linux, musl, osx, and win runtime identifiers) are affected in versions 9.0.0 and earlier, before 9.0.1. The source describes a remote code execution flaw that an attacker can trigger by sending a specially crafted request to a vulnerable web server. Upgrade to 9.0.1 or later, then restart applications, and recompile and redeploy self-contained applications.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.5 | High | 3.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C | CNA (microsoft) |
- CISA KEV Not listed.
- EPSS 0.017, the 77th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 14 Jan 2025, 18:13 UTC Published by the maintainers as a GitHub repository advisory
- 31 Oct 2026, 15:21 UTC First seen by agentprime
- 31 Oct 2026, 15:21 UTC Confirmed by OSV