---
id: CVE-2026-59990
title: Jawn is an open source JSON parser
summary: >-
  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
  th…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-770
vendor: typelevel
product: jawn
affected:
  - jawn < 1.7.0
published: '2026-09-23'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T20:17:11.903'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-59990'
references:
  - url: >-
      https://github.com/typelevel/jawn/commit/191cb3a44e77f1afab439ee636bf66bdf3c54a04
    label: security-advisories@github.com
  - url: >-
      https://github.com/typelevel/jawn/commit/6219666641f9408498f85868f835e17bd8a72fed
    label: security-advisories@github.com
  - url: >-
      https://github.com/typelevel/jawn/commit/93ac93e9c992c11b4c03d5455d8551f9fb24da1b
    label: security-advisories@github.com
  - url: >-
      https://github.com/typelevel/jawn/commit/f6ace7e0db715de1a8c4618bed9378333a5c2214
    label: security-advisories@github.com
  - url: 'https://github.com/typelevel/jawn/releases/tag/v1.7.0'
    label: security-advisories@github.com
  - url: 'https://github.com/typelevel/jawn/security/advisories/GHSA-cc4v-rvgp-2pf3'
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-cc4v-rvgp-2pf3'
tags:
  - nvd
  - cve.org
  - ghsa
  - maven
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-23T19:27:50.740766Z'
ingestedAt: '2026-09-23T19:31:04.461Z'
aliases:
  - GHSA-cc4v-rvgp-2pf3
ecosystem: maven
patched:
  - 'org.typelevel:jawn-parser_2.12 1.7.0'
  - 'org.typelevel:jawn-parser_2.13 1.7.0'
  - 'org.typelevel:jawn-parser_3 1.7.0'
epss: 0.00623
epssPercentile: 0.47647
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-59990)

Affected packages:

- `org.typelevel:jawn-parser_2.12 <= 1.6.0`
- `org.typelevel:jawn-parser_2.13 <= 1.6.0`
- `org.typelevel:jawn-parser_3 <= 1.6.0`

Patched in:

- `org.typelevel:jawn-parser_2.12 1.7.0`
- `org.typelevel:jawn-parser_2.13 1.7.0`
- `org.typelevel:jawn-parser_3 1.7.0`

Source: https://github.com/advisories/GHSA-cc4v-rvgp-2pf3