{"answers":{"affected":"8 open source packages ship an affected version, including Microsoft.OpenApi.Kiota and Microsoft.OpenApi.Kiota.Builder.","exploited":"There is no known exploitation of CVE-2026-59866 in the wild and no public exploit code.","fix":"Upgrade Microsoft.OpenApi.Kiota to a fixed version for your release line: 1.29.1 or 1.32.5.","what":"CVE-2026-59866 is a critical code injection vulnerability in microsoft kiota, published on 16 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-59866 and fix it if it is affected.\n\nWhat it is: CVE-2026-59866 is a critical code injection vulnerability in microsoft kiota, published on 16 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-59866 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- Microsoft.OpenApi.Kiota (NuGet): affected all versions; fixed in 1.29.1\n- Microsoft.OpenApi.Kiota (NuGet): affected all versions; fixed in 1.29.1\n- Microsoft.OpenApi.Kiota (NuGet): affected from 1.30.0; fixed in 1.32.5\n- Microsoft.OpenApi.Kiota (NuGet): affected from 1.30.0; fixed in 1.32.5\n- Microsoft.OpenApi.Kiota.Builder (NuGet): affected all versions; fixed in 1.29.1\n- Microsoft.OpenApi.Kiota.Builder (NuGet): affected all versions; fixed in 1.29.1\n- Microsoft.OpenApi.Kiota.Builder (NuGet): affected from 1.30.0; fixed in 1.32.5\n- Microsoft.OpenApi.Kiota.Builder (NuGet): affected from 1.30.0; fixed in 1.32.5\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-59866/ (Markdown: https://insights.sbomify.com/CVE-2026-59866/index.md)","id":"CVE-2026-59866","markdown":"https://insights.sbomify.com/CVE-2026-59866/index.md","name":"CVE-2026-59866","record":{"aliases":["GHSA-4vv7-jj25-4gh6"],"analysis":{"component_type":"developer_tool","fix_type":"upgrade","impacts":["code_execution","data_modify"],"network_reachable":"yes","non_default_config":false,"product_category":"OpenAPI code generator","requires_auth":"none","summary":"Attackers can inject arbitrary code and write files outside the output directory via malicious OpenAPI descriptions in Kiota code generation.","user_interaction":"not_required","vuln_class":"code_injection"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":9.3,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-94","name":"Improper Control of Generation of Code"},{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"}],"description":"Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 1.32.5, Kiota emitted x-ms-kiota-info clientClassName and clientNamespaceName values without identifier or path sanitization as both generated client class or namespace names and generated output path components when `kiota generate` ran without -c/--class-name, allowing an attacker-controlled or compromised OpenAPI description to write generated source outside the -o output directory and inject arbitrary text into generated class or namespace declarations. This issue is fixed in version 1.29.1 and 1.32.5 by GenerationConfiguration.SanitizeClientClassName and SanitizeClientNamespaceName.","ecosystems":["NuGet"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Kiota: Arbitrary file write + code-injection via x-ms-kiota-info clientClassName and clientNamespaceName","id":"CVE-2026-59866","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"NuGet","product":null,"products":[],"type":"code_injection","year":"2026"},"n_packages":8,"n_references":4,"next":{"headline":"Kiota: Generation-time SSRF + remote/local file inclusion via unrestricted $ref","id":"CVE-2026-59867"},"packages":[{"ecosystem":"NuGet","fixed":["1.29.1"],"introduced":["0"],"last_affected":[],"package":"Microsoft.OpenApi.Kiota","purl":null,"source":"GHSA-4vv7-jj25-4gh6"},{"ecosystem":"NuGet","fixed":["1.29.1"],"introduced":["0"],"last_affected":[],"package":"Microsoft.OpenApi.Kiota","purl":"pkg:nuget/Microsoft.OpenApi.Kiota","source":"GHSA-4vv7-jj25-4gh6"},{"ecosystem":"NuGet","fixed":["1.32.5"],"introduced":["1.30.0"],"last_affected":[],"package":"Microsoft.OpenApi.Kiota","purl":null,"source":"GHSA-4vv7-jj25-4gh6"},{"ecosystem":"NuGet","fixed":["1.32.5"],"introduced":["1.30.0"],"last_affected":[],"package":"Microsoft.OpenApi.Kiota","purl":"pkg:nuget/Microsoft.OpenApi.Kiota","source":"GHSA-4vv7-jj25-4gh6"},{"ecosystem":"NuGet","fixed":["1.29.1"],"introduced":["0"],"last_affected":[],"package":"Microsoft.OpenApi.Kiota.Builder","purl":null,"source":"GHSA-4vv7-jj25-4gh6"},{"ecosystem":"NuGet","fixed":["1.29.1"],"introduced":["0"],"last_affected":[],"package":"Microsoft.OpenApi.Kiota.Builder","purl":"pkg:nuget/Microsoft.OpenApi.Kiota.Builder","source":"GHSA-4vv7-jj25-4gh6"},{"ecosystem":"NuGet","fixed":["1.32.5"],"introduced":["1.30.0"],"last_affected":[],"package":"Microsoft.OpenApi.Kiota.Builder","purl":null,"source":"GHSA-4vv7-jj25-4gh6"},{"ecosystem":"NuGet","fixed":["1.32.5"],"introduced":["1.30.0"],"last_affected":[],"package":"Microsoft.OpenApi.Kiota.Builder","purl":"pkg:nuget/Microsoft.OpenApi.Kiota.Builder","source":"GHSA-4vv7-jj25-4gh6"}],"prev":{"headline":"Kiota: Command injection via x-ms-kiota-info dependencyInstallCommand surfaced by `kiota info`","id":"CVE-2026-59865"},"products":["kiota"],"published":"2026-07-16","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-08-17","vendors":["microsoft"]},"summary":"Attackers can inject arbitrary code and write files outside the output directory via malicious OpenAPI descriptions in Kiota code generation.","url":"https://insights.sbomify.com/CVE-2026-59866/"}