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Advisory record · GHSA-cc4v-rvgp-2pf3

Jawn: Uncontrolled nesting depth in JSON parser

CVSS 7.5 HighEPSS 0.0062 · 49th percentile

Published by the GitHub Advisory Database at 23 Sept 2026, 21:23 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.typelevel:jawn-parser_2.12Maven<1.7.01.7.0
org.typelevel:jawn-parser_2.13Maven<1.7.01.7.0
org.typelevel:jawn-parser_3Maven<1.7.01.7.0
Identifiers
GHSA-cc4v-rvgp-2pf3 · CVE-2026-59990
Weakness (CWE)
CWE-770
Tags
Published
23 Sept 2026
Updated
23 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The jawn-parser packages for Scala 2.12, 2.13 and 3 before 1.7.0 are vulnerable to denial of service from deeply nested JSON. A remote attacker who can submit JSON to a parse method can exhaust JVM heap and cause an OutOfMemoryError. Upgrade to 1.7.0, or limit the size of untrusted input before parsing.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0062, the 49th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.