23 Oct 2026 15:48:27 UTC
Jawn: Uncontrolled nesting depth in JSON parser
cve-program · CVE-2026-59990 · Published
CVE-2026-59990
Jawn: Uncontrolled nesting depth in JSON parser
CVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown
cve-program · CVE-2026-59990
PublishedJawn 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.
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