CVE-2026-59990
Published:September 23, 2026
Updated:October 11, 2026
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.
Affected Packages
https://github.com/typelevel/jawn.git (GITHUB):
Affected version(s) >=v0.5.0 <v1.7.0Fix Suggestion:
Update to version v1.7.0org.typelevel:jawn-parser_3 (JAVA):
Affected version(s) >=1.1.2 <1.7.0Fix Suggestion:
Update to version 1.7.0org.typelevel:jawn-parser_2.12 (JAVA):
Affected version(s) >=0.14.0 <1.7.0Fix Suggestion:
Update to version 1.7.0org.typelevel:jawn-parser_native0.5_3 (JAVA):
Affected version(s) =1.6.0 <1.7.0Fix Suggestion:
Update to version 1.7.0org.typelevel:jawn-parser_sjs1_2.12 (JAVA):
Affected version(s) >=1.2.0 <1.7.0Fix Suggestion:
Update to version 1.7.0org.typelevel:jawn-parser_native0.5_2.13 (JAVA):
Affected version(s) =1.6.0 <1.7.0Fix Suggestion:
Update to version 1.7.0org.typelevel:jawn-parser_2.13 (JAVA):
Affected version(s) >=0.14.2 <1.7.0Fix Suggestion:
Update to version 1.7.0org.typelevel:jawn-parser_native0.5_2.12 (JAVA):
Affected version(s) =1.6.0 <1.7.0Fix Suggestion:
Update to version 1.7.0org.typelevel:jawn-parser_sjs1_2.13 (JAVA):
Affected version(s) >=1.2.0 <1.7.0Fix Suggestion:
Update to version 1.7.0org.typelevel:jawn-parser_sjs1_3 (JAVA):
Affected version(s) >=1.2.0 <1.7.0Fix Suggestion:
Update to version 1.7.0Related Resources (9)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Allocation of Resources Without Limits or Throttling
EPSS
Base Score:
0.62