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.
History

Wed, 23 Sep 2026 21:15:00 +0000

Type Values Removed Values Added
First Time appeared Typelevel
Typelevel jawn
Vendors & Products Typelevel
Typelevel jawn

Wed, 23 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 23 Sep 2026 19:00:00 +0000

Type Values Removed Values Added
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.
Title Jawn: Uncontrolled nesting depth in JSON parser
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-09-23T18:41:12.073Z

Updated: 2026-09-23T19:27:58.498Z

Reserved: 2026-07-07T19:41:00.005Z

Link: CVE-2026-59990

cve-icon Vulnrichment

Updated: 2026-09-23T19:27:54.230Z

cve-icon NVD

Status : Deferred

Published: 2026-09-23T19:17:32.637

Modified: 2026-09-30T17:32:07.107

Link: CVE-2026-59990

cve-icon Redhat

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