{"schema_version":"1.7.3","id":"GHSA-2g4f-4pwh-qvx6","published":"2026-02-11T21:30:39Z","modified":"2026-03-04T15:06:32.662074Z","aliases":["CVE-2025-69873"],"related":["CGA-pjx7-r22p-cr2c"],"summary":"ajv has ReDoS when using `$data` option","details":"ajv (Another JSON Schema Validator) through version 8.17.1 is vulnerable to Regular Expression Denial of Service (ReDoS) when the `$data` option is enabled. The pattern keyword accepts runtime data via JSON Pointer syntax (`$data` reference), which is passed directly to the JavaScript `RegExp()` constructor without validation. An attacker can inject a malicious regex pattern (e.g., `\\\"^(a|a)*$\\\"`) combined with crafted input to cause catastrophic backtracking. A 31-character payload causes approximately 44 seconds of CPU blocking, with each additional character doubling execution time. This enables complete denial of service with a single HTTP request against any API using ajv with `$data`: true for dynamic schema validation.","affected":[{"package":{"name":"ajv","ecosystem":"npm","purl":"pkg:npm/ajv"},"ranges":[{"type":"SEMVER","events":[{"introduced":"7.0.0-alpha.0"},{"fixed":"8.18.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-2g4f-4pwh-qvx6/GHSA-2g4f-4pwh-qvx6.json"}},{"package":{"name":"ajv","ecosystem":"npm","purl":"pkg:npm/ajv"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"6.14.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/02/GHSA-2g4f-4pwh-qvx6/GHSA-2g4f-4pwh-qvx6.json"}}],"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-69873"},{"type":"WEB","url":"https://github.com/ajv-validator/ajv/pull/2586"},{"type":"WEB","url":"https://github.com/ajv-validator/ajv/pull/2588"},{"type":"WEB","url":"https://github.com/ajv-validator/ajv/pull/2590"},{"type":"WEB","url":"https://github.com/github/advisory-database/pull/6991"},{"type":"WEB","url":"https://github.com/ajv-validator/ajv/commit/720a23fa453ffae8340e92c9b0fe886c54cfe0d5"},{"type":"WEB","url":"https://github.com/EthanKim88/ethan-cve-disclosures/blob/main/CVE-2025-69873-ajv-ReDoS.md"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-2g4f-4pwh-qvx6"},{"type":"PACKAGE","url":"https://github.com/ajv-validator/ajv"},{"type":"WEB","url":"https://github.com/ajv-validator/ajv/releases/tag/v6.14.0"},{"type":"WEB","url":"https://github.com/ajv-validator/ajv/releases/tag/v8.18.0"}],"database_specific":{"cwe_ids":["CWE-1333","CWE-400"],"github_reviewed":true,"github_reviewed_at":"2026-02-17T16:38:57Z","nvd_published_at":"2026-02-11T19:15:50Z","severity":"MODERATE"},"severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P"}]}