[ CVE-2026-61814 · Published 23 Sep 2026 ]
Jawn: Quadratic parsing effort in AsyncParser
CVSS 7.5
EPSS <1%Fix available
[ Description ]Official description
Jawn is an open source JSON parser. Prior to 1.7.0, Jawn's AsyncParser can perform quadratic work when a single JSON token is delivered across many small chunks because each absorb call rescans the incomplete token from the start. A remote attacker who controls untrusted JSON input and its chunk sizes can exhaust CPU resources and cause denial of service in applications using AsyncParser. 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-w4cm-gvhj-cgw6
- org.typelevel:jawn-parser_2.13 mavenAffected <= 1.6.0 · fixed in 1.7.0 · GHSA-w4cm-gvhj-cgw6
- org.typelevel:jawn-parser_3 mavenAffected <= 1.6.0 · fixed in 1.7.0 · GHSA-w4cm-gvhj-cgw6