CVE-2026-73851

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 1.5%, top 27% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 1.34.0, an attacker who controls or tampers with the OpenAPI description consumed by Kiota can supply a file reference that resolves outside the manifest package (e.g. ../../../../etc/passwd, an absolute path, or a file:// / http(s):// URI). When the generated manifest is deployed and consumed by an AI host, this can lead to inclusion or disclosure of files outside the intended package boundary. This vulnerability is fixed in 1.29.1 and 1.34.0.

CVSS v3
6.1
EG Score
6.1(medium)
EG Risk
28(Track)
EG Risk 28/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity61% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
73%
KEV
Not listed

Published

August 17, 2026

Last Modified

September 18, 2026

Advisory Details (5)

Auto-updated Aug 17, 2026
Patch available. Sources: github, github_commit, github_pr.
github Patch Available

Path traversal in generated plugin manifest static_template.file reference (percent-encoding bypass) · Advisory · microsoft/kiota · GitHub

https://github.com/microsoft/kiota/security/advisories/GHSA-p5rm-jg5c-8c77
github_pr

Harden IsSafeFileReference against NUL, deep-encoding, and Unicode homoglyph traversal

Fix merged in microsoft/kiota PR #7913 on 2026-07-07 — awaiting tagged release

https://github.com/microsoft/kiota/pull/7913
github_pr

Fix percent-encoded path traversal in static_template IsSafeFileReference

Fix merged in microsoft/kiota PR #7910 on 2026-07-07 — awaiting tagged release

https://github.com/microsoft/kiota/pull/7910
github_commit

commit de3d18d9fe31 (microsoft/kiota)

Fix landed in microsoft/kiota commit de3d18d9fe31 — awaiting tagged release

https://github.com/microsoft/kiota/commit/de3d18d9fe31ced4ac749728d3a2f94811f59268
github_commit

commit 430008e9d700 (microsoft/kiota)

Fix landed in microsoft/kiota commit 430008e9d700 — awaiting tagged release

https://github.com/microsoft/kiota/commit/430008e9d700b3fe80f206c672415cfbd8e830e7

Vendor Advisories for CVE-2026-73851(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
NuGet(1)
PackageVulnerable rangeFixed inDependents
Microsoft.OpenApi.Kiota0.1.0-preview ... 1.9.1 (66 versions)1.29.1—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 50× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

  1. 2026-09-18 20:24 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-17 22:01 UTCEG score recompute
  4. 2026-09-16 23:08 UTCEG score recompute
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-15 20:15 UTCEG score recompute
  8. 2026-09-15 03:12 UTCEPSS rescore
  9. 2026-09-13 22:08 UTCEG score recompute
  10. 2026-09-12 23:15 UTCEG score recompute
  11. 2026-09-12 15:02 UTCEPSS rescore
  12. 2026-09-12 00:21 UTCEG score recompute
  13. 2026-09-11 14:53 UTCEPSS rescore
  14. 2026-09-11 01:28 UTCEG score recompute
  15. 2026-09-10 09:35 UTCEPSS rescore
  16. 2026-09-09 03:41 UTCEG score recompute
  17. 2026-09-08 22:01 UTCEPSS rescore
  18. 2026-09-07 20:57 UTCEG score recompute
  19. 2026-09-06 22:04 UTCEG score recompute
  20. 2026-09-06 13:48 UTCEPSS rescore
  21. 2026-09-05 23:08 UTCEG score recompute
  22. 2026-09-05 00:14 UTCEG score recompute
  23. 2026-09-04 05:07 UTCEPSS rescore
  24. 2026-09-03 00:42 UTCEG score recompute
  25. 2026-09-02 14:12 UTCEPSS rescore
Show 34 more
  1. 2026-09-02 01:48 UTCEG score recompute
  2. 2026-09-01 13:54 UTCEPSS rescore
  3. 2026-09-01 04:40 UTCEPSS rescore
  4. 2026-09-01 04:40 UTCEPSS rescore
  5. 2026-08-31 03:25 UTCEG score recompute
  6. 2026-08-30 19:18 UTCEPSS rescore
  7. 2026-08-30 19:17 UTCEPSS rescore
  8. 2026-08-30 04:32 UTCEG score recompute
  9. 2026-08-30 01:22 UTCEPSS rescore
  10. 2026-08-29 05:38 UTCEG score recompute
  11. 2026-08-28 21:42 UTCEPSS rescore
  12. 2026-08-28 04:40 UTCEG score recompute
  13. 2026-08-27 14:25 UTCEPSS rescore
  14. 2026-08-27 05:43 UTCEG score recompute
  15. 2026-08-26 14:47 UTCEPSS rescore
  16. 2026-08-26 06:33 UTCEG score recompute
  17. 2026-08-25 13:49 UTCEPSS rescore
  18. 2026-08-25 07:31 UTCEG score recompute
  19. 2026-08-24 14:18 UTCEPSS rescore
  20. 2026-08-23 09:44 UTCEG score recompute
  21. 2026-08-23 00:19 UTCEPSS rescore
  22. 2026-08-22 10:51 UTCEG score recompute
  23. 2026-08-21 23:49 UTCEPSS rescore
  24. 2026-08-21 11:58 UTCEG score recompute
  25. 2026-08-20 22:56 UTCEPSS rescore
  26. 2026-08-20 13:05 UTCEG score recompute
  27. 2026-08-19 17:04 UTCEPSS rescore
  28. 2026-08-18 15:16 UTCEG score recompute
  29. 2026-08-18 13:49 UTCEPSS rescore
  30. 2026-08-18 13:49 UTCEPSS rescore
  31. 2026-08-17 16:22 UTCEG score recompute
  32. 2026-08-17 15:50 UTCEG score recompute
  33. 2026-08-17 15:20 UTCEG score recompute
  34. 2026-08-17 15:20 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2026-73851?
CVE-2026-73851 is a medium vulnerability published on August 17, 2026. Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 1.34.0, an attacker who controls or tampers with the OpenAPI description consumed by Kiota can supply a file reference that resolves outside the manifest package (e.g. ../../../../etc/passwd, an absolute path, or a file:// /…
When was CVE-2026-73851 disclosed?
CVE-2026-73851 was first published in the National Vulnerability Database on August 17, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73851 actively exploited?
CVE-2026-73851 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 27.3% of all scored CVEs.
What is the CVSS score of CVE-2026-73851?
CVE-2026-73851 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-73851?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73851, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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