Answer in brief
CVE-2026-41134 records a High severity (CVSS 7.8) vulnerability in Kiota: Code Generation Literal Injection. The current sources do not mark it as known exploited. The current feed maps microsoft/kiota (generic), Microsoft.OpenApi.Kiota (nuget), Microsoft.OpenApi.Kiota (nuget), Microsoft.OpenApi.Kiota.Builder (nuget) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps microsoft/kiota (generic), Microsoft.OpenApi.Kiota (nuget), Microsoft.OpenApi.Kiota (nuget), Microsoft.OpenApi.Kiota.Builder (nuget) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:microsoft:kiota:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| microsoft/kiotageneric | >= 1.30.0, < 1.31.1 || < 1.29.1 | Not reported |
| Microsoft.OpenApi.Kiotanuget | >=1.30.0,<1.31.1 | 1.31.1 |
| Microsoft.OpenApi.Kiotanuget | <1.29.1 | 1.29.1 |
| Microsoft.OpenApi.Kiota.Buildernuget | >=1.30.0,<1.31.1 | 1.31.1 |
| Microsoft.OpenApi.Kiota.Buildernuget | <1.29.1 | 1.29.1 |
Published upstream
Apr 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 17, 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 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.
Quoted source text, attributed separately from HOL analysis.