CVE-2026-59990
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductOrg.typelevel:jawn-parser
PublishedSep 23, 2026
First seenSep 23, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- org.typelevel:jawn-parser_2.121.7.0 or later
- org.typelevel:jawn-parser_2.131.7.0 or later
- org.typelevel:jawn-parser_31.7.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| org.typelevel:jawn-parser_2.12Maven | v < 1.7.0 | 1.7.0 |
| org.typelevel:jawn-parser_2.13Maven | v < 1.7.0 | 1.7.0 |
| org.typelevel:jawn-parser_3Maven | v < 1.7.0 | 1.7.0 |
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