{"id":"GHSA-cc4v-rvgp-2pf3","summary":"Jawn: Uncontrolled nesting depth in JSON parser","details":"The Jawn parser before 1.6.1 is vulnerable to a denial of service attack via untrusted input.\n\n### Impact\n\nA remote attacker who can submit JSON to any jawn-backed parse method can exhaust JVM heap and trigger `java.lang.OutOfMemoryError`.  This is treated by Scala as a fatal error and not typically handled by `scala.util.Try` or `cats.effect.IO`.\n\n### Patches\n\nVersion `1.6.1` introduces a configurable nesting-depth limit (`Parser#maxDepth`, default `4096`).  Inputs deeper than the limit fail with a recoverable `ParseException` instead of exhausting heap.\n\nUsers who require deeper nesting may override `maxDepth` on a `Parser` subclass.\n\n### Workarounds\n\n- Enforce an input size limit small enough that the resulting context stack cannot exhaust heap, (e.g. http4s `EntityLimiter`).\n- Pre-scan untrusted input and reject documents whose maximum delimiter nesting exceeds a threshold before handing them to jawn.","aliases":["CVE-2026-59990"],"modified":"2026-09-23T21:30:04.437683237Z","published":"2026-09-23T21:23:54Z","database_specific":{"cwe_ids":["CWE-770"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-09-23T21:23:54Z","nvd_published_at":null},"references":[{"type":"WEB","url":"https://github.com/typelevel/jawn/security/advisories/GHSA-cc4v-rvgp-2pf3"},{"type":"WEB","url":"https://github.com/typelevel/jawn/commit/191cb3a44e77f1afab439ee636bf66bdf3c54a04"},{"type":"WEB","url":"https://github.com/typelevel/jawn/commit/6219666641f9408498f85868f835e17bd8a72fed"},{"type":"WEB","url":"https://github.com/typelevel/jawn/commit/93ac93e9c992c11b4c03d5455d8551f9fb24da1b"},{"type":"WEB","url":"https://github.com/typelevel/jawn/commit/f6ace7e0db715de1a8c4618bed9378333a5c2214"},{"type":"PACKAGE","url":"https://github.com/typelevel/jawn"},{"type":"WEB","url":"https://github.com/typelevel/jawn/releases/tag/v1.7.0"}],"affected":[{"package":{"name":"org.typelevel:jawn-parser_2.12","ecosystem":"Maven","purl":"pkg:maven/org.typelevel/jawn-parser_2.12"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.0"}]}],"versions":["0.14.0","0.14.1","0.14.2","0.14.3","1.0.0","1.0.0-RC1","1.0.0-RC2","1.0.0-RC3","1.0.0-RC4","1.0.1","1.0.2","1.0.3","1.1.0","1.1.1","1.1.2","1.2.0","1.3.0","1.3.1","1.3.2","1.4.0","1.5.0","1.5.1","1.6.0"],"database_specific":{"last_known_affected_version_range":"\u003c= 1.6.0","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-cc4v-rvgp-2pf3/GHSA-cc4v-rvgp-2pf3.json"}},{"package":{"name":"org.typelevel:jawn-parser_2.13","ecosystem":"Maven","purl":"pkg:maven/org.typelevel/jawn-parser_2.13"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.0"}]}],"versions":["0.14.2","0.14.3","1.0.0","1.0.0-RC1","1.0.0-RC2","1.0.0-RC3","1.0.0-RC4","1.0.1","1.0.2","1.0.3","1.1.0","1.1.1","1.1.2","1.2.0","1.3.0","1.3.1","1.3.2","1.4.0","1.5.0","1.5.1","1.6.0"],"database_specific":{"last_known_affected_version_range":"\u003c= 1.6.0","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-cc4v-rvgp-2pf3/GHSA-cc4v-rvgp-2pf3.json"}},{"package":{"name":"org.typelevel:jawn-parser_3","ecosystem":"Maven","purl":"pkg:maven/org.typelevel/jawn-parser_3"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.0"}]}],"versions":["1.1.2","1.2.0","1.3.0","1.3.1","1.3.2","1.4.0","1.5.0","1.5.1","1.6.0"],"database_specific":{"last_known_affected_version_range":"\u003c= 1.6.0","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/09/GHSA-cc4v-rvgp-2pf3/GHSA-cc4v-rvgp-2pf3.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}