CVE-2026-25592

CRITICALNVD 9.99.9
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 9.9 from GitHub Security Advisory (severity: CRITICAL) published 2026-02-06. NVD baseline CVSS 9.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this week

Also known asEUVD-2026-5582 (ENISA EUVD) · GHSA-2ww3-72rp-wpp4 (GitHub Security Advisories)Source: ENISA EUVD

9.9EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.6%CVSS: 9.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Semantic Kernel is an SDK used to build, orchestrate, and deploy AI agents and multi-agent systems. Prior to 1.71.0, an Arbitrary File Write vulnerability has been identified in Microsoft's Semantic Kernel .NET SDK, specifically within the SessionsPythonPlugin. The problem has been fixed in Microsoft.SemanticKernel.Core version 1.71.0. As a mitigation, users can create a Function Invocation Filter which checks the arguments being passed to any calls to DownloadFileAsync  or UploadFileAsync and ensures the provided localFilePath is allow listed.

CVSS v3
9.9
EG Score
9.9CRITICALmedium confidence
EG Risk
46
EG Risk 46/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity99% × 45%
Impact severity (EG Severity): CVSS 9.9 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation2.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
2.6%
EPSS %ILE
85th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.9): severity, escalated by confirmed exploitation. This CVE's 9.9 is its impact severity (EG Severity), not escalated.

EG Severity
9.9 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
2.6% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

February 6, 2026

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Nov 2, 2026
Patch available. Sources: github_pr, github.
GitHub advisoryMentions a patch (unverified)

Arbitrary File Write via AI Agent Function Calling in .NET SDK · Advisory · microsoft/semantic-kernel · GitHub

https://github.com/microsoft/semantic-kernel/security/advisories/GHSA-2ww3-72rp-wpp4
GitHub pull request Patch Available

Python: Add file upload security controls to SessionsPythonPlugin

Patch available: microsoft/semantic-kernel python-1.39.3 (PR #13478 merged 2026-01-29)

https://github.com/microsoft/semantic-kernel/pull/13478/changes#diff-88d3cacba2bfa84eef8f2aa171b34f9940338cbb784a3ffc49f5fe3af1b8943d
Web page

semantic-kernel/dotnet/samples/Demos/CodeInterpreterPlugin/Program.cs at main · microsoft/semantic-kernel · GitHub

https://github.com/microsoft/semantic-kernel/blob/main/dotnet/samples/Demos/CodeInterpreterPlugin/Program.cs#L61-L64

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
nugetMicrosoft.SemanticKernel.Core @ 1.71.0 (fixes < 1.71.0)—ghsa
pipsemantic-kernel @ 1.39.3 (fixes < 1.39.3)—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(2 across 2 ecosystems)
NuGet(1)
PackageVulnerable rangeFix by version rangeDependents
Microsoft.SemanticKernel.Core0.12.207.1-preview ... 1.9.0 (113 versions)
  • every version up to 1.71.0: fixed in 1.71.0
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
semantic-kernel0.0.1.dev0 ... 1.9.0 (125 versions)
  • every version up to 1.39.3: fixed in 1.39.3
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 16× in last 7d / 59× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 99 of 238 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 139 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 07:27 UTCEG score recompute
  2. 2026-11-02 07:27 UTCGHSA enrichmentGHSA-2ww3-72rp-wpp4 · GitHub severity CRITICAL · GitHub CVSS 9.9
  3. 2026-11-01 16:34 UTCEPSS rescoreEPSS 2.6% · 85th percentile
  4. 2026-11-01 09:16 UTCGHSA enrichmentGHSA-2ww3-72rp-wpp4 · GitHub severity CRITICAL · GitHub CVSS 9.9
  5. 2026-11-01 07:57 UTCGHSA enrichmentGHSA-2ww3-72rp-wpp4 · GitHub severity CRITICAL · GitHub CVSS 9.9
  6. 2026-11-01 07:57 UTCEG score recompute
  7. 2026-10-31 16:32 UTCEPSS rescoreEPSS 2.6% · 85th percentile
  8. 2026-10-31 11:06 UTCEG score recompute
  9. 2026-10-30 16:34 UTCEPSS rescoreEPSS 2.6% · 85th percentile
  10. 2026-10-30 12:56 UTCEG score recompute
  11. 2026-10-29 16:33 UTCEPSS rescoreEPSS 2.6% · 85th percentile
  12. 2026-10-28 16:36 UTCEG score recompute
  13. 2026-10-28 16:31 UTCEPSS rescoreEPSS 2.6% · 85th percentile
  14. 2026-10-27 18:23 UTCEG score recompute
  15. 2026-10-27 16:31 UTCEPSS rescoreEPSS 2.6% · 84th percentile
  16. 2026-10-26 20:14 UTCEG score recompute
  17. 2026-10-26 16:31 UTCEPSS rescoreEPSS 2.6% · 84th percentile
  18. 2026-10-25 20:06 UTCEG score recompute
  19. 2026-10-25 16:32 UTCEPSS rescoreEPSS 2.6% · 84th percentile
  20. 2026-10-25 14:40 UTCEG score recompute
  21. 2026-10-24 21:56 UTCEG score recompute
  22. 2026-10-24 16:32 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  23. 2026-10-23 23:46 UTCEG score recompute
  24. 2026-10-23 16:31 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  25. 2026-10-23 01:31 UTCEG score recompute
Show 74 more
  1. 2026-10-22 16:34 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  2. 2026-10-22 02:51 UTCEG score recompute
  3. 2026-10-21 16:32 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  4. 2026-10-21 04:35 UTCEG score recompute
  5. 2026-10-20 16:32 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  6. 2026-10-20 06:26 UTCEG score recompute
  7. 2026-10-19 16:31 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  8. 2026-10-19 08:15 UTCEG score recompute
  9. 2026-10-18 16:31 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  10. 2026-10-18 03:52 UTCEG score recompute
  11. 2026-10-17 16:33 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  12. 2026-10-17 11:28 UTCEG score recompute
  13. 2026-10-16 16:41 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  14. 2026-10-16 13:16 UTCEG score recompute
  15. 2026-10-15 16:31 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  16. 2026-10-15 15:05 UTCEG score recompute
  17. 2026-10-14 16:32 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  18. 2026-10-14 09:32 UTCEG score recompute
  19. 2026-10-13 16:33 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  20. 2026-10-13 07:09 UTCEG score recompute
  21. 2026-10-12 16:33 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  22. 2026-10-12 16:19 UTCEG score recompute
  23. 2026-10-11 20:01 UTCEG score recompute
  24. 2026-10-11 17:14 UTCEG score recompute
  25. 2026-10-11 14:46 UTCEG score recompute
  26. 2026-10-11 13:48 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  27. 2026-10-10 20:00 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  28. 2026-10-09 20:07 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  29. 2026-10-09 08:58 UTCOSV refresh
  30. 2026-10-08 17:11 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  31. 2026-10-07 23:47 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  32. 2026-10-06 15:17 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  33. 2026-10-05 17:42 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  34. 2026-10-04 23:21 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  35. 2026-10-03 14:25 UTCEPSS rescoreEPSS 2.2% · 81st percentile
  36. 2026-10-01 19:49 UTCEPSS rescoreEPSS 2.2% · 81st percentile
  37. 2026-09-30 15:03 UTCEPSS rescoreEPSS 2.2% · 81st percentile
  38. 2026-09-28 13:51 UTCEPSS rescoreEPSS 2.2% · 81st percentile
  39. 2026-09-26 15:58 UTCEPSS rescoreEPSS 2.2% · 81st percentile
  40. 2026-09-26 00:26 UTCEPSS rescoreEPSS 2.2% · 81st percentile
  41. 2026-09-24 14:03 UTCEPSS rescoreEPSS 2.1% · 81st percentile
  42. 2026-09-19 16:03 UTCOSV refresh
  43. 2026-09-18 19:27 UTCEPSS rescoreEPSS 2.5% · 83rd percentile
  44. 2026-09-16 14:07 UTCEPSS rescoreEPSS 2.5% · 83rd percentile
  45. 2026-09-16 05:15 UTCEPSS rescoreEPSS 2.5% · 83rd percentile
  46. 2026-09-12 15:01 UTCEPSS rescoreEPSS 2.5% · 83rd percentile
  47. 2026-09-11 14:52 UTCEPSS rescoreEPSS 2.5% · 83rd percentile
  48. 2026-09-10 09:34 UTCEPSS rescoreEPSS 2.5% · 83rd percentile
  49. 2026-09-08 22:00 UTCEPSS rescoreEPSS 2.5% · 83rd percentile
  50. 2026-09-07 16:01 UTCEPSS rescoreEPSS 2.5% · 83rd percentile
  51. 2026-09-06 13:47 UTCEPSS rescoreEPSS 2.5% · 83rd percentile
  52. 2026-09-04 05:06 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  53. 2026-09-02 14:11 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  54. 2026-09-01 13:53 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  55. 2026-09-01 04:39 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  56. 2026-08-31 19:34 UTCOSV refresh
  57. 2026-08-30 19:17 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  58. 2026-08-30 01:22 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  59. 2026-08-28 21:41 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  60. 2026-08-27 14:25 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  61. 2026-08-26 14:46 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  62. 2026-08-25 13:48 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  63. 2026-08-23 00:19 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  64. 2026-08-21 23:49 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  65. 2026-08-20 22:55 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  66. 2026-08-19 17:03 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  67. 2026-08-18 13:48 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  68. 2026-08-17 13:47 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  69. 2026-08-16 14:56 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  70. 2026-08-16 02:14 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  71. 2026-08-15 01:30 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  72. 2026-08-14 10:58 UTCEG score recompute
  73. 2026-08-13 22:00 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  74. 2026-08-13 03:17 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-25592?
CVE-2026-25592 is a critical-severity vulnerability; its CVE record was published on February 6, 2026. Semantic Kernel is an SDK used to build, orchestrate, and deploy AI agents and multi-agent systems. Prior to 1.71.0, an Arbitrary File Write vulnerability has been identified in Microsoft's Semantic Kernel .NET SDK, specifically within the SessionsPythonPlugin. The problem has been fixed in…
When was the CVE record for CVE-2026-25592 published?
The CVE record for CVE-2026-25592 was published on February 6, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
Is CVE-2026-25592 actively exploited?
CVE-2026-25592 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.6% probability of exploitation in the next 30 days (85th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-25592?
CVE-2026-25592 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-25592?
A fix for CVE-2026-25592 is available: update to the fixed version the vendor names in its advisory.

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