CVE-2026-41134

HIGHNVD 7.87.8
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.8 under NVD CVSS v3. EPSS exploit probability: 0.4% (27th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Trending — 3 sources updated this week
7.8EG
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: 0.4%CVSS: 7.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Kiota is an OpenAPI based HTTP Client code generator. Versions prior to 1.29.1 and 1.31.1 are affected by a code-generation literal injection vulnerability in multiple writer sinks (for example: serialization/deserialization keys, path/query parameter mappings, URL template metadata, enum/property metadata, and default value emission). When malicious values from an OpenAPI description are emitted into generated source without context-appropriate escaping, an attacker can break out of string literals and inject additional code into generated clients. This issue is only practically exploitable when the OpenAPI description used for generation is from an untrusted source, or a normally trusted OpenAPI description has been compromised/tampered with. Only generating from trusted, integrity-protected API descriptions significantly reduces the risk. To remediate the issue, upgrade Kiota to 1.29.1, 1.31.1, or later and regenerate/refresh existing generated clients as a precaution. Refreshing generated clients ensures previously generated vulnerable code is replaced with hardened output.

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100

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 (value × EchelonGraph’s weight)
Severity78% × 45%
The EG Score, 7.8 of 10.
Exploitation0.4% × 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
0.4%
EPSS %ILE
27th
KEV
Not listed

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.

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

April 22, 2026

Last Modified

August 17, 2026

Advisory Details (1)

Auto-updated May 14, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

CVE Advisory (CVE-2026-41134): Code Generation Literal Injection in Kiota · Advisory · microsoft/kiota · GitHub

https://github.com/microsoft/kiota/security/advisories/GHSA-2hx3-vp6r-mg3f

Vendor Advisories for CVE-2026-41134(1)

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

Affected Packages

(3 across 1 ecosystem)
NuGet(3)
PackageVulnerable rangeFix by version rangeDependents
kiota0.1.0
  • every version up to 1.31.1: fixed in 1.31.1
—
Microsoft.OpenApi.Kiota0.1.0-preview ... 1.9.1 (66 versions)
  • 1.30.0 up to 1.31.1: fixed in 1.31.1
  • every version up to 1.29.1: fixed in 1.29.1
—
Microsoft.OpenApi.Kiota.Builder0.2.0-preview ... 1.9.1 (46 versions)
  • 1.30.0 up to 1.31.1: fixed in 1.31.1
  • every version up to 1.29.1: fixed in 1.29.1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 28× 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 181 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 82 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  2. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  3. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  4. 2026-10-14 01:54 UTCOSV refresh
  5. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  6. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  7. 2026-10-12 16:08 UTCEG score recompute
  8. 2026-10-11 19:51 UTCEG score recompute
  9. 2026-10-11 17:04 UTCEG score recompute
  10. 2026-10-11 14:30 UTCEG score recompute
  11. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  12. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  13. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  14. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  15. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  16. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  17. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  18. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  19. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  20. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  21. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  22. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  23. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  24. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  25. 2026-09-23 09:53 UTCOSV refresh
Show 74 more
  1. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  2. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  3. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  4. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  5. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  6. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  7. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  8. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  9. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  10. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  11. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  12. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  13. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  14. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  15. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  16. 2026-09-04 04:29 UTCOSV refresh
  17. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  18. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  19. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  20. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  21. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  22. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  23. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  24. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  25. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  26. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  27. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  28. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  29. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  30. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  31. 2026-08-17 15:22 UTCEG score recompute
  32. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  33. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  34. 2026-08-16 05:56 UTCEG score recompute
  35. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  36. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  37. 2026-08-14 04:16 UTCEG score recompute
  38. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  39. 2026-08-12 18:27 UTCEG score recompute
  40. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  41. 2026-08-11 16:44 UTCEG score recompute
  42. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  43. 2026-08-11 02:17 UTCEG score recompute
  44. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  45. 2026-08-09 16:31 UTCEG score recompute
  46. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  47. 2026-08-09 03:28 UTCEG score recompute
  48. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  49. 2026-08-08 01:47 UTCEG score recompute
  50. 2026-08-07 12:43 UTCEG score recompute
  51. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  52. 2026-08-05 23:02 UTCEG score recompute
  53. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  54. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  55. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  56. 2026-08-02 11:59 UTCEG score recompute
  57. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  58. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  59. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  60. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  61. 2026-07-28 15:36 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  62. 2026-07-27 14:13 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  63. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  64. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  65. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  66. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  67. 2026-07-23 03:11 UTCEG score recompute
  68. 2026-07-22 14:08 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  69. 2026-07-21 15:24 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  70. 2026-07-20 17:08 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  71. 2026-07-20 17:02 UTCOSV refresh
  72. 2026-07-19 14:31 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  73. 2026-07-19 02:29 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  74. 2026-07-18 10:04 UTCEPSS rescoreEPSS 0.4% · 34th percentile

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Frequently asked(5)

What is CVE-2026-41134?
CVE-2026-41134 is a high-severity vulnerability; its CVE record was published on April 22, 2026. Kiota is an OpenAPI based HTTP Client code generator. Versions prior to 1.29.1 and 1.31.1 are affected by a code-generation literal injection vulnerability in multiple writer sinks (for example: serialization/deserialization keys, path/query parameter mappings, URL template metadata, enum/property…
When was the CVE record for CVE-2026-41134 published?
The CVE record for CVE-2026-41134 was published on April 22, 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 August 17, 2026; the record at its source may have been updated since.
Is CVE-2026-41134 actively exploited?
CVE-2026-41134 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (27th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-41134?
CVE-2026-41134 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-41134?
A fix for CVE-2026-41134 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-41134 are linked in the Vendor Advisories panel on this page.

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