{"id":"CVE-2026-73299","revision":null,"records":[{"revision":"520d5bccdc1c40a48dd307b56f284578","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-73299","aliases":[],"title":"Prompty: Server-Side Template Injection to Remote Code Execution in the @prompty/core Nunjucks Renderer","description":"Prompty is a markdown file format (.prompty) for LLM prompts. Prior to 0.1.5 and 2.0.0-beta.5, the TypeScript Nunjucks renderer evaluated untrusted .prompty template bodies with unrestricted JavaScript member access. An attacker-controlled template could traverse constructor and prototype properties to execute JavaScript in the host Node.js process. This issue is fixed in versions 0.1.5 and 2.0.0-beta.5.","state":0,"publishedAt":"2026-08-12T17:31:38.807+00:00","modifiedAt":"2026-08-12T18:54:20.646+00:00","affected":[{"ecosystem":"Vendor product","name":"prompty","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"microsoft\",\n                    \"product\": \"prompty\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 0.1.5\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 2.0.0-alpha.1, < 2.0.0-beta.5\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","score":10,"severity":"CRITICAL"}],"references":["https://github.com/microsoft/prompty/security/advisories/GHSA-w28w-gp39-m4p6","https://github.com/microsoft/prompty/pull/404","https://github.com/microsoft/prompty/pull/405","https://github.com/microsoft/prompty/commit/e4a0ebf49e3a78d5d7796c8480bf9a4f0c54d19e","https://github.com/microsoft/prompty/commit/f5c57c94a0990cca79d095c3daab661b4b1fb89f","https://github.com/microsoft/prompty/tree/typescript/2.0.0-beta.5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-73299","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-73299","identifiers":["CVE-2026-73299"]},"retained":false,"historicalAffected":[]},{"revision":"10322fe26b9e4fcda1e7cde6375d91e9","observedAt":"2026-10-25T15:19:03.401+00:00","statement":{"source":"nvd","id":"CVE-2026-73299","aliases":[],"title":"Prompty is a markdown file format (.prompty) for LLM prompts. Prior to 0.1.5 and 2.0.0-beta.5, the TypeScript Nunjucks renderer evaluated untrusted .prompty template bodies with unrestricted JavaScript member access. An attacker-controlled …","description":"Prompty is a markdown file format (.prompty) for LLM prompts. Prior to 0.1.5 and 2.0.0-beta.5, the TypeScript Nunjucks renderer evaluated untrusted .prompty template bodies with unrestricted JavaScript member access. An attacker-controlled template could traverse constructor and prototype properties to execute JavaScript in the host Node.js process. This issue is fixed in versions 0.1.5 and 2.0.0-beta.5.","state":0,"publishedAt":"2026-08-12T18:18:15.197+00:00","modifiedAt":"2026-10-24T15:10:00.19+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","score":10,"severity":"CRITICAL"}],"references":["https://github.com/microsoft/prompty/commit/e4a0ebf49e3a78d5d7796c8480bf9a4f0c54d19e","https://github.com/microsoft/prompty/commit/f5c57c94a0990cca79d095c3daab661b4b1fb89f","https://github.com/microsoft/prompty/pull/404","https://github.com/microsoft/prompty/pull/405","https://github.com/microsoft/prompty/security/advisories/GHSA-w28w-gp39-m4p6","https://github.com/microsoft/prompty/tree/typescript/2.0.0-beta.5"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73299","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-94","CWE-1336"],"productCriteria":[],"sourceDates":{"published":"2026-08-12T18:18:15.197","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-2026-73299","identifiers":["CVE-2026-73299"]},"retained":false,"historicalAffected":[]},{"revision":"93f9cff52f524bd9969b59007248704a","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-w28w-gp39-m4p6","aliases":["CVE-2026-73299"],"title":"Prompty: Server-Side Template Injection to Remote Code Execution in the @prompty/core Nunjucks Renderer","description":"## Summary\nThe TypeScript Nunjucks renderer evaluated untrusted `.prompty` template bodies with unrestricted JavaScript member access. An attacker-controlled template could traverse constructor and prototype properties to execute JavaScript in the host Node.js process.\n\n## Affected packages\n- npm `@prompty/core` versions `<= 0.1.4`\n- npm `@prompty/core` versions `<= 2.0.0-beta.4`\n\n## Impact\nApplications that render untrusted, community-supplied, cloned, or LLM-generated `.prompty` files with the TypeScript runtime could allow attacker-controlled code execution with the privileges of the Node.js host process.\n\n## Remediation\nUpgrade to `@prompty/core` `2.0.0-beta.5` or later. The patched renderer sanitizes render inputs to own-data-only values, rejects constructor/prototype member traversal, and disallows template function calls. Ordinary interpolation, conditionals, loops, and own nested data properties remain supported.\n\n## Fix details\nThe fix is merged in PR #404 and includes regression coverage for default Nunjucks rendering, explicit renderer usage, unsafe member lookups, and attempted template function calls.","state":0,"publishedAt":"2026-07-24T16:23:59+00:00","modifiedAt":"2026-08-13T04:11:08.0154715+00:00","affected":[{"ecosystem":"npm","name":"@prompty/core","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.1.5"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@prompty/core","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"2.0.0-alpha.1"},{"kind":"fixed","version":"2.0.0-beta.5"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"CRITICAL"}],"references":["https://github.com/microsoft/prompty/security/advisories/GHSA-w28w-gp39-m4p6","https://github.com/microsoft/prompty/pull/404","https://github.com/microsoft/prompty/commit/047756f4c8caf91c5868eeb42520c938393277b0","https://github.com/microsoft/prompty"],"sourceUrl":"https://github.com/advisories/GHSA-w28w-gp39-m4p6","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-w28w-gp39-m4p6","identifiers":["GHSA-w28w-gp39-m4p6","CVE-2026-73299"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-10-25T23:02:08.9235896+00:00","complete":true,"records":1756,"lastAttemptAt":"2026-10-25T23:02:08.9235896+00:00","lastSuccessAt":"2026-10-25T23:02:09.0869487+00:00","error":null,"lastVerifiedAt":"2026-10-25T23:02:09.0869513+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-1a687ad2a0b90150aa7d97c9f39e63de695ae2db23e31ebc28df1492c461b23c-5e0a45ae0cf63c80268dd44eaeb20879d480eba4da3306bde3dcd925fa4c114f","complete":true,"records":414047,"lastAttemptAt":"2026-10-25T23:02:08.5196863+00:00","lastSuccessAt":"2026-10-25T23:02:08.4495153+00:00","error":null,"lastVerifiedAt":"2026-10-25T23:02:08.5196863+00:00","snapshotPublishedAt":"2026-10-25T22:26:55+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-43321610382942b8ad8c85917eab1546","complete":false,"records":4735,"lastAttemptAt":"2026-10-25T23:02:11.7890287+00:00","lastSuccessAt":"2026-10-24T23:18:49.862+00:00","error":"InvalidDataException","lastVerifiedAt":"2026-10-24T23:18:49.862+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":4764,"expectedIdentifiers":13474},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-10-25T23:02:08.9235896+00:00","complete":true,"records":1093,"lastAttemptAt":"2026-10-25T23:02:08.9235896+00:00","lastSuccessAt":"2026-10-25T23:02:09.087647+00:00","error":null,"lastVerifiedAt":"2026-10-25T23:02:09.08765+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-204a3fb93a00487e8f7f36db01dc851d","complete":true,"records":13413,"lastAttemptAt":"2026-10-25T23:02:09.6218557+00:00","lastSuccessAt":"2026-10-25T16:19:28.681+00:00","error":null,"lastVerifiedAt":"2026-10-25T16:19:28.681+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13474,"expectedIdentifiers":13474},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-2375a4e597279abf92e8747e140fe8da9d421877cd49cae3ac69a2cb78469b2c","complete":true,"records":9779,"lastAttemptAt":"2026-10-25T23:02:08.8808579+00:00","lastSuccessAt":"2026-10-24T13:19:53.1346702+00:00","error":null,"lastVerifiedAt":"2026-10-25T23:02:08.8808579+00:00","snapshotPublishedAt":"2026-10-24T03:03:12+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-16ad89dfea13ab9e9b0108e63a759d63bd4559cc68b58491107d62ee35bbbaf2","complete":true,"records":1965,"lastAttemptAt":"2026-10-25T23:02:08.6737644+00:00","lastSuccessAt":"2026-10-23T16:01:26.4487605+00:00","error":null,"lastVerifiedAt":"2026-10-25T23:02:08.6737644+00:00","snapshotPublishedAt":"2026-10-21T12:18:07+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-7da67a15aa6e56a0e3081a7646dc74d537e6ef974afc593c2b1794ed01970648","complete":true,"records":2969,"lastAttemptAt":"2026-10-25T23:02:08.8933341+00:00","lastSuccessAt":"2026-10-24T13:19:59.1145547+00:00","error":null,"lastVerifiedAt":"2026-10-25T23:02:08.8933341+00:00","snapshotPublishedAt":"2026-10-24T08:47:51+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-11236ada05a0588e51df37636716526867f73fb127392c49680b6f8561496a99","complete":true,"records":230781,"lastAttemptAt":"2026-10-25T23:02:08.7805888+00:00","lastSuccessAt":"2026-10-25T22:04:07.173333+00:00","error":null,"lastVerifiedAt":"2026-10-25T23:02:08.7805888+00:00","snapshotPublishedAt":"2026-10-25T21:33:06+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null}]}