[ CVE-2026-59990 · Published 23 Sep 2026 ]
Jawn: Uncontrolled nesting depth in JSON parser
CVSS 7.5
EPSS <1%Fix available
[ Description ]Official description
Jawn is an open source JSON parser. Prior to 1.7.0, Jawn parse methods accept arbitrarily deep JSON array and object nesting without a depth limit, allowing a remote attacker who can submit untrusted JSON to grow parser contexts until the JVM heap is exhausted. The resulting java.lang.OutOfMemoryError is a fatal Scala error that is not ordinarily handled by scala.util.Try or cats.effect.IO, causing denial of service. This issue is fixed in version 1.7.0.
[ Fixes ]Fixes and patches
- org.typelevel:jawn-parser_2.12 1.7.0Fixed version · GitHub Advisories · maven package org.typelevel:jawn-parser_2.12: upgrade to 1.7.0 or later (affected <= 1.6.0)
- org.typelevel:jawn-parser_2.13 1.7.0Fixed version · GitHub Advisories · maven package org.typelevel:jawn-parser_2.13: upgrade to 1.7.0 or later (affected <= 1.6.0)
- org.typelevel:jawn-parser_3 1.7.0Fixed version · GitHub Advisories · maven package org.typelevel:jawn-parser_3: upgrade to 1.7.0 or later (affected <= 1.6.0)
[ Packages ]Affected open-source packages
- org.typelevel:jawn-parser_2.12 mavenAffected <= 1.6.0 · fixed in 1.7.0 · GHSA-cc4v-rvgp-2pf3
- org.typelevel:jawn-parser_2.13 mavenAffected <= 1.6.0 · fixed in 1.7.0 · GHSA-cc4v-rvgp-2pf3
- org.typelevel:jawn-parser_3 mavenAffected <= 1.6.0 · fixed in 1.7.0 · GHSA-cc4v-rvgp-2pf3
[ References ]References
- github.com/typelevel/jawn/commit/191cb3a44e77f1afab439ee636bf66bdf3c54a04
- github.com/typelevel/jawn/commit/6219666641f9408498f85868f835e17bd8a72fed
- github.com/typelevel/jawn/commit/93ac93e9c992c11b4c03d5455d8551f9fb24da1b
- github.com/typelevel/jawn/commit/f6ace7e0db715de1a8c4618bed9378333a5c2214
- github.com/typelevel/jawn/releases/tag/v1.7.0
- github.com/typelevel/jawn/security/advisories/GHSA-cc4v-rvgp-2pf3