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CVE-2026-59990

7.5 · HIGH

Jawn is an open source JSON parser.

Published Sep 23, 2026CWE-770EPSS 0.61%

Overview

CVE-2026-59990 is a high-severity vulnerability. It was published on September 23, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/typelevel/jawn/commit/191cb3a44e77f1afab439ee636bf66bdf3c54a04GitHubgithub.com/typelevel/jawn/commit/6219666641f9408498f85868f835e17bd8a72fedGitHubgithub.com/typelevel/jawn/commit/93ac93e9c992c11b4c03d5455d8551f9fb24da1bGitHubgithub.com/typelevel/jawn/commit/f6ace7e0db715de1a8c4618bed9378333a5c2214GitHubgithub.com/typelevel/jawn/releases/tag/v1.7.0GitHubgithub.com/typelevel/jawn/security/advisories/GHSA-cc4v-rvgp-2pf3

How CyberStrike helps

Frequently asked questions

What is CVE-2026-59990?

CVE-2026-59990 is a high-severity vulnerability. It was published on September 23, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-59990?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-59990?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-59990?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-59990 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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