CVE-2026-59861

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 2.0%, top 20% 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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 7.5Exploit: 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 1.32.0, Kiota's Ruby generator embedded OpenAPI default fields, property names, and other schema-derived strings through CodeMethodWriter.cs and SanitizeForQuotedLiteral() in Writers/StringExtensions.cs into Ruby double-quoted literals without escaping #, allowing attacker-controlled #{expr}, #$var, or #@var interpolation markers to inject arbitrary Ruby code into generated model classes. This issue is fixed in version 1.29.1 and 1.32.0.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: 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
Severity75% × 45%
Exploitation2% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
80%
KEV
Not listed

Published

July 16, 2026

Last Modified

August 17, 2026

Advisory Details (4)

Auto-updated Jul 16, 2026
Patch available. Sources: github_release, github, github_pr, github_commit.
github_release Patch Available

v1.32.0

Patch available: microsoft/kiota v1.32.0

https://github.com/microsoft/kiota/releases/tag/v1.32.0
github_commit

commit fee1b648bb43 (microsoft/kiota)

Fix landed in microsoft/kiota commit fee1b648bb43 — awaiting tagged release

https://github.com/microsoft/kiota/commit/fee1b648bb4394ba7ba72de9c0ce4f2a0bad0cb6
github_pr

fix(ruby): escape interpolation markers in generated string literals

Fix merged in microsoft/kiota PR #7746 on 2026-06-02 — awaiting tagged release

https://github.com/microsoft/kiota/pull/7746
github Patch Available

Code Generation Literal Injection in Kiota Ruby Generator · Advisory · microsoft/kiota · GitHub

https://github.com/microsoft/kiota/security/advisories/GHSA-xg2h-5xr2-29jw

Vendor Advisories for CVE-2026-59861(1)

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

Affected Packages

(4 across 1 ecosystem)
NuGet(4)
PackageVulnerable rangeFixed inDependents
Microsoft.OpenApi.Kiota0.1.0-preview ... 1.9.1 (69 versions)1.32.0—
Microsoft.OpenAPI.Kiota0.1.0-preview ... 1.9.1 (69 versions)1.32.0—
Microsoft.OpenApi.Kiota.Builder0.2.0-preview ... 1.9.1 (46 versions)1.32.0—
Microsoft.OpenAPI.Kiota.Builder0.2.0-preview ... 1.9.1 (46 versions)1.32.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 54× 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. 2026-09-01 13:54 UTCEPSS rescore
  2. 2026-09-01 04:40 UTCEPSS rescore
  3. 2026-08-31 03:43 UTCEG score recompute
  4. 2026-08-30 19:17 UTCEPSS rescore
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  7. 2026-08-28 21:42 UTCEPSS rescore
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  14. 2026-08-24 15:18 UTCEG score recompute
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  16. 2026-08-23 00:19 UTCEPSS rescore
  17. 2026-08-22 07:38 UTCEG score recompute
  18. 2026-08-21 23:49 UTCEPSS rescore
  19. 2026-08-21 09:23 UTCEG score recompute
  20. 2026-08-20 22:55 UTCEPSS rescore
  21. 2026-08-19 23:56 UTCEG score recompute
  22. 2026-08-19 17:04 UTCEPSS rescore
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  24. 2026-08-18 13:48 UTCEPSS rescore
  25. 2026-08-17 15:22 UTCEG score recompute
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  1. 2026-08-17 13:47 UTCEPSS rescore
  2. 2026-08-17 01:23 UTCEG score recompute
  3. 2026-08-16 14:56 UTCEPSS rescore
  4. 2026-08-16 03:09 UTCEG score recompute
  5. 2026-08-16 02:14 UTCEPSS rescore
  6. 2026-08-15 04:55 UTCEG score recompute
  7. 2026-08-15 01:30 UTCEPSS rescore
  8. 2026-08-14 06:39 UTCEG score recompute
  9. 2026-08-13 22:00 UTCEPSS rescore
  10. 2026-08-12 21:16 UTCEG score recompute
  11. 2026-08-12 13:51 UTCEPSS rescore
  12. 2026-08-11 23:01 UTCEG score recompute
  13. 2026-08-11 00:47 UTCEG score recompute
  14. 2026-08-11 00:00 UTCEPSS rescore
  15. 2026-08-09 15:25 UTCEG score recompute
  16. 2026-08-09 13:46 UTCEPSS rescore
  17. 2026-08-08 17:11 UTCEG score recompute
  18. 2026-08-08 16:37 UTCEPSS rescore
  19. 2026-08-07 18:56 UTCEG score recompute
  20. 2026-08-06 20:42 UTCEG score recompute
  21. 2026-08-06 13:47 UTCEPSS rescore
  22. 2026-08-05 22:28 UTCEG score recompute
  23. 2026-08-05 19:17 UTCEPSS rescore
  24. 2026-08-05 00:09 UTCEG score recompute
  25. 2026-08-04 15:10 UTCEPSS rescore
  26. 2026-08-04 13:01 UTCEG score recompute
  27. 2026-08-04 10:39 UTCEPSS rescore
  28. 2026-08-03 12:53 UTCEG score recompute
  29. 2026-08-03 10:36 UTCEPSS rescore
  30. 2026-08-02 03:06 UTCEG score recompute
  31. 2026-08-02 02:27 UTCEPSS rescore
  32. 2026-08-01 04:51 UTCEG score recompute
  33. 2026-08-01 04:16 UTCEPSS rescore
  34. 2026-07-30 19:15 UTCEG score recompute
  35. 2026-07-30 16:28 UTCEPSS rescore
  36. 2026-07-30 08:07 UTCEG score recompute
  37. 2026-07-30 01:30 UTCEPSS rescore
  38. 2026-07-30 01:30 UTCEPSS rescore
  39. 2026-07-29 20:27 UTCEG score recompute
  40. 2026-07-29 20:04 UTCEG score recompute
  41. 2026-07-28 19:09 UTCEG score recompute
  42. 2026-07-28 15:37 UTCEPSS rescore
  43. 2026-07-27 20:51 UTCEG score recompute
  44. 2026-07-27 14:14 UTCEPSS rescore
  45. 2026-07-26 22:36 UTCEG score recompute
  46. 2026-07-26 14:54 UTCEPSS rescore
  47. 2026-07-26 14:54 UTCEPSS rescore
  48. 2026-07-26 11:25 UTCEG score recompute
  49. 2026-07-25 14:18 UTCEPSS rescore
  50. 2026-07-25 14:18 UTCEPSS rescore
  51. 2026-07-24 14:18 UTCEPSS rescore
  52. 2026-07-24 14:18 UTCEPSS rescore
  53. 2026-07-23 14:18 UTCEPSS rescore
  54. 2026-07-23 14:18 UTCEPSS rescore
  55. 2026-07-23 03:21 UTCEG score recompute
  56. 2026-07-22 14:08 UTCEPSS rescore
  57. 2026-07-22 14:08 UTCEPSS rescore
  58. 2026-07-21 15:25 UTCEPSS rescore
  59. 2026-07-21 15:25 UTCEPSS rescore
  60. 2026-07-20 17:08 UTCEPSS rescore
  61. 2026-07-19 14:31 UTCEPSS rescore
  62. 2026-07-19 02:29 UTCEPSS rescore
  63. 2026-07-18 10:04 UTCEPSS rescore
  64. 2026-07-17 07:02 UTCEG score recompute
  65. 2026-07-16 14:45 UTCEG score recompute
  66. 2026-07-16 14:44 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-59861?
CVE-2026-59861 is a high vulnerability published on July 16, 2026. Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 1.32.0, Kiota's Ruby generator embedded OpenAPI default fields, property names, and other schema-derived strings through CodeMethodWriter.cs and SanitizeForQuotedLiteral() in Writers/StringExtensions.cs into Ruby…
When was CVE-2026-59861 disclosed?
CVE-2026-59861 was first published in the National Vulnerability Database on July 16, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59861 actively exploited?
CVE-2026-59861 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 20.1% of all scored CVEs.
What is the CVSS score of CVE-2026-59861?
CVE-2026-59861 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-59861?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59861, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-59861

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