CVE-2026-59990 — Jawn: Uncontrolled nesting depth in JSON parser

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.

Affected products

Vendor	Product	Affected	Fixed
typelevel	jawn	< 1.7.0	—

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

Debian

Security tracker ↗

Release	Package	Fixed in	Advisory
Debian 14	jawn	No fix yet	—
Debian 13	jawn	No fix yet	—
Debian 12	jawn	No fix yet	—

Ubuntu