CVE-2026-59990

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.

Overview

State: PUBLISHED
Assigner (CNA): GitHub_M
CVSS severity: HIGH
CVSS score: 7.5 / 10
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Effective score: 7.5 / 10 HIGH source: CNA overview
CWE(s): CWE-770
Reserved: 2026-07-07
Published: 2026-09-23 18:41 UTC
Last updated: 2026-09-23 19:27 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/59xxx/CVE-2026-59990.json
Linked Threat: CVE-2026-59990 — Jawn: Uncontrolled nesting depth in JSON parser

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-23 19:17:32 UTC
NVD last modified: 2026-09-23 20:17:11 UTC
NVD CVSS v3.1: 7.5 / 10 HIGH source: security-advisories@github.com
NVD CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitability subscore: 3.9 / 10
Impact subscore: 3.6 / 10

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-85554

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Affected products (1)

Vendor	Product	Versions	Platforms
typelevel	jawn	`< 1.7.0` (affected)	—

Vendor references (6)

References embedded in the original CVE record by the assigning CNA.

https://github.com/typelevel/jawn/security/advisories/GHSA-cc4v-rvgp-2pf3 x_refsource_CONFIRM
https://github.com/typelevel/jawn/commit/191cb3a44e77f1afab439ee636bf66bdf3c54a04 x_refsource_MISC
https://github.com/typelevel/jawn/commit/6219666641f9408498f85868f835e17bd8a72fed x_refsource_MISC
https://github.com/typelevel/jawn/commit/93ac93e9c992c11b4c03d5455d8551f9fb24da1b x_refsource_MISC
https://github.com/typelevel/jawn/commit/f6ace7e0db715de1a8c4618bed9378333a5c2214 x_refsource_MISC
https://github.com/typelevel/jawn/releases/tag/v1.7.0 x_refsource_MISC

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (6)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://github.com/typelevel/jawn/commit/191cb3a44e77f1afab439ee636bf66bdf3c54a04 security-advisories@github.com
https://github.com/typelevel/jawn/commit/6219666641f9408498f85868f835e17bd8a72fed security-advisories@github.com
https://github.com/typelevel/jawn/commit/93ac93e9c992c11b4c03d5455d8551f9fb24da1b security-advisories@github.com
https://github.com/typelevel/jawn/commit/f6ace7e0db715de1a8c4618bed9378333a5c2214 security-advisories@github.com
https://github.com/typelevel/jawn/releases/tag/v1.7.0 security-advisories@github.com
https://github.com/typelevel/jawn/security/advisories/GHSA-cc4v-rvgp-2pf3 security-advisories@github.com

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-59990.json.

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