CVE-2026-25592
Arbitrary file write in Semantic Kernel .NET SDK before 1.70.0 (SessionsPythonPlugin).
Is CVE-2026-25592 being exploited?
Not confirmed. CVE-2026-25592 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 2.5% probability of exploitation in the next 30 days.
How severe is CVE-2026-25592?
CVE-2026-25592 is rated Critical with a CVSS score of 9.9. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-25592?
Yes. A fix has been recorded for CVE-2026-25592. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-25592 affect?
CVE-2026-25592 affects Microsoft Semantic Kernel .NET SDK (SessionsPythonPlugin) < 1.70.0. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-25592?
Upgrade to 1.70.0+; enable allow-listed localFilePath checks.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Arbitrary file write on host via crafted DownloadFileAsync/UploadFileAsync calls; may cause data loss or code execution.
Patch when possible
- affected< 1.71.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.