CVE-2026-59990
Jawn: Uncontrolled nesting depth in JSON parser
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-770 |
| Vendor | typelevel |
| Product | jawn |
| Published | Sep 23, 2026 |
| Last Updated | Sep 23, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
typelevel / jawn
< 1.7.0
References
github.com: https://github.com/typelevel/jawn/security/advisories/GHSA-cc4v-rvgp-2pf3 github.com: https://github.com/typelevel/jawn/commit/191cb3a44e77f1afab439ee636bf66bdf3c54a04 github.com: https://github.com/typelevel/jawn/commit/6219666641f9408498f85868f835e17bd8a72fed github.com: https://github.com/typelevel/jawn/commit/93ac93e9c992c11b4c03d5455d8551f9fb24da1b github.com: https://github.com/typelevel/jawn/commit/f6ace7e0db715de1a8c4618bed9378333a5c2214 github.com: https://github.com/typelevel/jawn/releases/tag/v1.7.0