{"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-2026-59859 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 1.32.4.","what":"CVE-2026-59859 is a high-severity code injection vulnerability in microsoft kiota, published on 16 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-59859 and fix it if it is affected.\n\nWhat it is: CVE-2026-59859 is a high-severity code injection vulnerability in microsoft kiota, published on 16 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-59859 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 1.32.4\n- Microsoft.OpenApi.Kiota (NuGet): affected from 1.30.0; fixed in 1.32.4\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 1.32.4\n- Microsoft.OpenApi.Kiota.Builder (NuGet): affected from 1.30.0; fixed in 1.32.4\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-2026-59859/ (Markdown: https://insights.sbomify.com/CVE-2026-59859/index.md)","id":"CVE-2026-59859","markdown":"https://insights.sbomify.com/CVE-2026-59859/index.md","name":"CVE-2026-59859","record":{"aliases":["GHSA-jqwh-526h-c92j"],"analysis":{"component_type":"developer_tool","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"OpenAPI code generator","requires_auth":"none","summary":"Attackers can inject arbitrary PHP code into generated client classes via malicious OpenAPI schemas, requiring developers to upgrade Kiota.","user_interaction":"required","vuln_class":"code_injection"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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"}],"description":"Kiota is an OpenAPI based HTTP Client code generator. Prior to 1.29.1 and 1.32.4, Kiota's PHP generator embedded OpenAPI description, default fields, property names, and other schema-derived strings into PHP double-quoted literals through SanitizeDoubleQuote() in Writers/StringExtensions.cs without escaping $, allowing attacker-controlled ${...}, $var, or {$obj-\u003eprop} interpolation constructs to inject arbitrary PHP code into generated model and request-builder classes. This issue is fixed in version 1.29.1 and 1.32.4.","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: Code Generation Literal Injection in the PHP Generator","id":"CVE-2026-59859","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: XML Doc-Comment Newline Breakout Code Injection","id":"CVE-2026-59860"},"packages":[{"ecosystem":"NuGet","fixed":["1.29.1"],"introduced":["0"],"last_affected":[],"package":"Microsoft.OpenApi.Kiota","purl":null,"source":"GHSA-jqwh-526h-c92j"},{"ecosystem":"NuGet","fixed":["1.29.1"],"introduced":["0"],"last_affected":[],"package":"Microsoft.OpenApi.Kiota","purl":"pkg:nuget/Microsoft.OpenApi.Kiota","source":"GHSA-jqwh-526h-c92j"},{"ecosystem":"NuGet","fixed":["1.32.4"],"introduced":["1.30.0"],"last_affected":[],"package":"Microsoft.OpenApi.Kiota","purl":null,"source":"GHSA-jqwh-526h-c92j"},{"ecosystem":"NuGet","fixed":["1.32.4"],"introduced":["1.30.0"],"last_affected":[],"package":"Microsoft.OpenApi.Kiota","purl":"pkg:nuget/Microsoft.OpenApi.Kiota","source":"GHSA-jqwh-526h-c92j"},{"ecosystem":"NuGet","fixed":["1.29.1"],"introduced":["0"],"last_affected":[],"package":"Microsoft.OpenApi.Kiota.Builder","purl":null,"source":"GHSA-jqwh-526h-c92j"},{"ecosystem":"NuGet","fixed":["1.29.1"],"introduced":["0"],"last_affected":[],"package":"Microsoft.OpenApi.Kiota.Builder","purl":"pkg:nuget/Microsoft.OpenApi.Kiota.Builder","source":"GHSA-jqwh-526h-c92j"},{"ecosystem":"NuGet","fixed":["1.32.4"],"introduced":["1.30.0"],"last_affected":[],"package":"Microsoft.OpenApi.Kiota.Builder","purl":null,"source":"GHSA-jqwh-526h-c92j"},{"ecosystem":"NuGet","fixed":["1.32.4"],"introduced":["1.30.0"],"last_affected":[],"package":"Microsoft.OpenApi.Kiota.Builder","purl":"pkg:nuget/Microsoft.OpenApi.Kiota.Builder","source":"GHSA-jqwh-526h-c92j"}],"prev":{"headline":"Vim: Arbitrary Code Execution via C Omni-Completion","id":"CVE-2026-59858"},"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":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-08-17","vendors":["microsoft"]},"summary":"Attackers can inject arbitrary PHP code into generated client classes via malicious OpenAPI schemas, requiring developers to upgrade Kiota.","url":"https://insights.sbomify.com/CVE-2026-59859/"}