Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Microsoft.Build.Tasks.Core, Microsoft.Build, and Microsoft.Build.Utilities.Core NuGet packages in several 17.x ranges and 18.0.0 preview builds are affected on Linux, where predictable temporary directory paths let another local user pre-create them and disrupt builds (denial of service). The source gives few details on the exact attacker steps. Upgrade to 17.8.43, 17.10.46, 17.11.48, 17.12.50, 17.14.28, or 18.0.0-preview-25476-107, depending on your version line.
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 |
|---|---|---|---|---|
| 7.3 | High | 3.1 | CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C | CNA (microsoft) |
- CISA KEV Not listed.
- EPSS 0.0062, the 50th percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:22 UTC First seen by agentprime
- 31 Oct 2026, 15:22 UTC Confirmed by OSV