Hash collision in typelevel jawn

Summary

Jawn is an open source JSON parser. Extenders of the `org.typelevel.jawn.SimpleFacade` and `org.typelevel.jawn.MutableFacade` who don't override `objectContext()` are vulnerable to a hash collision attack which may result in a denial of service. Most applications do not implement these traits directly, but inherit from a library. `jawn-parser-1.3.1` fixes this issue and users are advised to upgrade. For users unable to upgrade override `objectContext()` to use a collision-safe collection.

Timeline

1. Jan 5, 2022, 9:00 PM UTCCVE published
2. Apr 22, 2025, 3:52 PM UTCCISA SSVC assessment

   Exploitation: poc · Automatable: no · Technical impact: partial

3. Apr 22, 2025, 6:34 PM UTCRecord last updated

Affected versions

• typelevel jawn

  fixed in 1.3.2

• org.typelevel:jawn-parser_0.25Maven

  All versions

• org.typelevel:jawn-parsergMaven

  All versions

• org.typelevel:jawn-parser_0.27Maven

  All versions

• org.typelevel:jawn-parser_2.10Maven

  All versions

• org.typelevel:jawn-parser_2.11Maven

  All versions

• org.typelevel:jawn-parser_2.12Maven

  fixed in 1.3.2

• org.typelevel:jawn-parser_2.13Maven

  fixed in 1.3.2

• org.typelevel:jawn-parser_2.13.0-M5Maven

  All versions

• org.typelevel:jawn-parser_2.13.0-RC1Maven

  All versions

• org.typelevel:jawn-parser_2.13.0-RC2Maven

  All versions

• org.typelevel:jawn-parser_2.13.0-RC3Maven

  All versions

• org.typelevel:jawn-parser_3Maven

  fixed in 1.3.2

• org.typelevel:jawn-parser_3.0.0-M1Maven

  All versions

• org.typelevel:jawn-parser_3.0.0-M2Maven

  All versions

• org.typelevel:jawn-parser_3.0.0-M3Maven

  All versions

• org.typelevel:jawn-parser_3.0.0-RC1Maven

  All versions

• org.typelevel:jawn-parser_3.0.0-RC2Maven

  All versions

• org.typelevel:jawn-parser_3.0.0-RC3Maven

  All versions

References 2