{"id":"CVE-2026-73851","revision":null,"records":[{"revision":"ca010dbec5014daaad9b003a115af054","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-73851","aliases":[],"title":"Kiota: Path traversal in generated plugin manifest static_template.file reference (percent-encoding bypass)","description":"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.","state":0,"publishedAt":"2026-08-17T15:11:39.724+00:00","modifiedAt":"2026-08-17T15:26:40.14+00:00","affected":[{"ecosystem":"Vendor product","name":"kiota","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"microsoft\",\n                    \"product\": \"kiota\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 1.30.0, < 1.34.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"< 1.29.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N","score":6.1,"severity":"MEDIUM"}],"references":["https://github.com/microsoft/kiota/security/advisories/GHSA-p5rm-jg5c-8c77","https://github.com/microsoft/kiota/issues/7912","https://github.com/microsoft/kiota/pull/7910","https://github.com/microsoft/kiota/pull/7913","https://github.com/microsoft/kiota/commit/430008e9d700b3fe80f206c672415cfbd8e830e7","https://github.com/microsoft/kiota/commit/de3d18d9fe31ced4ac749728d3a2f94811f59268","https://github.com/microsoft/kiota/releases/tag/v1.29.1","https://github.com/microsoft/kiota/releases/tag/v1.34.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-73851","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-73851","identifiers":["CVE-2026-73851"]},"retained":false,"historicalAffected":[]},{"revision":"3ba8dc981adb4f4581661b23e170f9c0","observedAt":"2026-10-25T15:19:09.409+00:00","statement":{"source":"nvd","id":"CVE-2026-73851","aliases":[],"title":"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…","description":"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.","state":0,"publishedAt":"2026-08-17T15:16:57.98+00:00","modifiedAt":"2026-10-24T15:10:00.19+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":6.1,"severity":"MEDIUM"}],"references":["https://github.com/microsoft/kiota/commit/430008e9d700b3fe80f206c672415cfbd8e830e7","https://github.com/microsoft/kiota/commit/de3d18d9fe31ced4ac749728d3a2f94811f59268","https://github.com/microsoft/kiota/issues/7912","https://github.com/microsoft/kiota/pull/7910","https://github.com/microsoft/kiota/pull/7913","https://github.com/microsoft/kiota/releases/tag/v1.29.1","https://github.com/microsoft/kiota/releases/tag/v1.34.0","https://github.com/microsoft/kiota/security/advisories/GHSA-p5rm-jg5c-8c77"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73851","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-22","CWE-829"],"productCriteria":[],"sourceDates":{"published":"2026-08-17T15:16:57.980","lastModified":"2026-10-24T15:10:00.190"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-73851","identifiers":["CVE-2026-73851"]},"retained":false,"historicalAffected":[]},{"revision":"148ab488c7cd4e74933ac2ad6ab78869","observedAt":"2026-10-23T16:01:25.029+00:00","statement":{"source":"osv","id":"GHSA-p5rm-jg5c-8c77","aliases":["CVE-2026-73851"],"title":"Microsoft Kiota: Path traversal in generated plugin manifest static_template.file reference (percent-encoding bypass)","description":"### Impact\n\nKiota generates AI plugin manifests from an OpenAPI description. When the description contains an `x-ai-capabilities` response semantics `static_template` (or the adaptive-card extension `x-ai-adaptive-card`), the `file` reference is written into the generated manifest's `response_semantics.static_template.file` and is later resolved by the AI host **relative to the plugin package**.\n\nAn 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 (CWE-22 Path Traversal, CWE-829 Inclusion of Functionality from an Untrusted Control Sphere).\n\nA mitigation shipped in v1.32.5 (`ExtensionResponseSemanticsStaticTemplate.IsSafeFileReference`) rejected literal traversal, rooted paths, drive-qualified paths, and absolute URIs. However, that check inspected the **raw** reference string, so **percent-encoded** payloads bypassed every check and were still emitted verbatim. Examples that were incorrectly accepted as safe:\n\n| Input | Decodes to |\n|-------|-----------|\n| `%2e%2e/card.json` | `../card.json` |\n| `..%2f..%2f..%2f..%2f..%2f..%2fetc%2fpasswd` | `../../../../../../etc/passwd` |\n| `file%3A%2F%2F%2Fetc%2Fpasswd` | `file:///etc/passwd` |\n| `%2e%2e%2f%2e%2e%2f%2e%2e%2fetc%2fpasswd` | `../../../etc/passwd` |\n\nMulti-level (double) encoding such as `%252e%252e%252fcard.json` was also affected. A follow-up review found additional residual bypasses of the same validator: an embedded NUL byte (`%00`) that truncated the path and defeated the parent-directory segment check, encoding nested deeper than the decode budget (which failed open), and Unicode full-width homoglyphs (e.g. `%EF%BC%8E%EF%BC%8E` → `．．`).\n\n### Patches\n\n- The percent-encoding bypass is fixed by decoding the reference (bounded multi-pass) before validation: https://github.com/microsoft/kiota/pull/7910\n- Residual bypasses (NUL / control characters, decode-budget fail-open, Unicode homoglyphs) are fixed by failing closed on residual encoding, rejecting control characters, and NFKC-folding before validation: https://github.com/microsoft/kiota/pull/7913 (tracking issue https://github.com/microsoft/kiota/issues/7912)\n\nUsers should upgrade to the first released `Microsoft.OpenApi.Kiota` version that includes these fixes (the release following 1.33.0).\n\n### Workarounds\n\n- Only generate clients/plugins from trusted OpenAPI descriptions.\n- Review generated plugin manifests before deployment and reject any `response_semantics.static_template.file` value that is not a simple relative path within the `adaptiveCards/` package folder (no `..`, no rooted/absolute paths, no URIs, no percent-encoded separators).\n\n### References\n\n- CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')\n- CWE-829: Inclusion of Functionality from an Untrusted Control Sphere\n- Affected code: `src/Kiota.Builder/OpenApiExtensions/OpenApiAiCapabilitiesExtension.cs` (`IsSafeFileReference`) and enforcement in `src/Kiota.Builder/Plugins/PluginsGenerationService.cs`.","state":0,"publishedAt":"2026-07-24T16:14:56+00:00","modifiedAt":"2026-08-17T15:25:59.758241+00:00","affected":[{"ecosystem":"NuGet","name":"Microsoft.OpenApi.Kiota","ranges":[{"type":"ECOSYSTEM","events":[{"kind":"introduced","version":"1.30.0"},{"kind":"fixed","version":"1.34.0"}]}],"versions":["1.30.0","1.31.0","1.31.1","1.32.0","1.32.1","1.32.2","1.32.3","1.32.4","1.32.5","1.33.0"],"rawVersionEvidence":null},{"ecosystem":"NuGet","name":"Microsoft.OpenApi.Kiota","ranges":[{"type":"ECOSYSTEM","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.29.1"}]}],"versions":["0.1.0-preview","0.1.1-preview","0.1.2-preview","0.1.3-preview","0.10.0-preview","0.11.0-preview","0.11.1-preview","0.2.0-preview","0.2.1-preview","0.3.0-preview","0.4.0-preview","0.5.0-preview","0.5.1-preview","0.6.0-preview","0.7.1-preview","0.8.3-preview","0.9.0-preview","1.0.0","1.0.1","1.1.0","1.1.1","1.1.2","1.1.3","1.10.0","1.10.1","1.11.0","1.11.1","1.12.0","1.13.0","1.14.0","1.15.0","1.16.0","1.17.0","1.18.0","1.19.0","1.19.1","1.2.0","1.2.1","1.20.0","1.21.0","1.22.0","1.22.1","1.22.2","1.22.3","1.23.0","1.24.0","1.24.1","1.24.2","1.24.3","1.25.1","1.26.0","1.26.1","1.27.0","1.28.0","1.29.0","1.3.0","1.4.0","1.5.0","1.5.1","1.6.1","1.7.0","1.8.0","1.8.1","1.8.2","1.9.0","1.9.1"],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/microsoft/kiota/security/advisories/GHSA-p5rm-jg5c-8c77","https://github.com/microsoft/kiota/issues/7912","https://github.com/microsoft/kiota/pull/7910","https://github.com/microsoft/kiota/pull/7913","https://github.com/microsoft/kiota/commit/430008e9d700b3fe80f206c672415cfbd8e830e7","https://github.com/microsoft/kiota/commit/de3d18d9fe31ced4ac749728d3a2f94811f59268","https://github.com/microsoft/kiota","https://github.com/microsoft/kiota/releases/tag/v1.34.0"],"sourceUrl":"https://github.com/advisories/GHSA-p5rm-jg5c-8c77","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-p5rm-jg5c-8c77","identifiers":["GHSA-p5rm-jg5c-8c77","CVE-2026-73851"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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