CVE-2026-59866

Kiota before versions 1.29.1 and 1.34.0 allows an attacker who controls or tampers with the OpenAPI description to 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.

Kiota before versions 1.29.1 and 1.32.5 displayed dependency install commands from an OpenAPI description as recommended, allowing command injection when the suggested command was run manually or via the VS Code extension.

Kiota before versions 1.29.1 and 1.32.5 in plugin add and plugin generate commands did not validate paths in the static_template.file field, allowing path traversal or out-of-package file inclusion in generated plugin manifests.

Kiota before versions 1.29.1 and 1.32.5 resolved OpenAPI $ref values by fetching remote URLs and reading local file paths, allowing SSRF, remote file inclusion, and local file inclusion during client generation.

Kiota before versions 1.29.1 and 1.32.5 honored a poisoned workspace.json configuration without validating output paths, allowing generated files to be written outside the workspace root on a developer or CI host.

Kiota before versions 1.29.1 and 1.32.0 in the Python generator did not sanitize enum value descriptions, allowing Python code injection into generated comments that could be executed when modules are imported.

Kiota before versions 1.29.1 and 1.32.0 in the Ruby generator did not escape the # character in string literals, allowing arbitrary Ruby code injection into generated model classes.

Kiota before versions 1.29.1 and 1.32.3 has a code-generation injection vulnerability in the C# XML documentation-comment sink, where text from an OpenAPI description is written without stripping newline characters, allowing injection of additional code into generated C# clients.

Kiota, an OpenAPI based HTTP client code generator, prior to versions 1.29.1 and 1.32.4 contains a PHP code injection vulnerability. The PHP generator fails to escape the $ character in double-quoted strings, allowing attacker-controlled interpolation constructs to inject arbitrary PHP code into generated model and request-builder classes.

Kiota versions prior to 1.29.1 and 1.31.1 are affected by a code-generation literal injection vulnerability in multiple writer sinks. When malicious values from an OpenAPI description are emitted without proper escaping, an attacker can break out of string literals and inject additional code into generated clients.