What’s Vulnerable › Vulnerabilities

CVE-2022-21653: Hash collision in typelevel jawn

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-01-05 · updated 2026-06-17
• Weakness: CWE-400

Description

Jawn is an open source JSON parser. Extenders of the `org.typelevel.jawn.SimpleFacade` and `org.typelevel.jawn.MutableFacade` who don't override `objectContext()` are vulnerable to a hash collision attack which may result in a denial of service. Most applications do not implement these traits directly, but inherit from a library. `jawn-parser-1.3.1` fixes this issue and users are advised to upgrade. For users unable to upgrade override `objectContext()` to use a collision-safe collection.

Affected products

• typelevel jawn: before 1.3.2 — fixed in 1.3.2

How to fix

Upgrade to a fixed version: typelevel jawn 1.3.2. Check the vendor advisory for mitigations.

References

• https://github.com/typelevel/jawn/pull/390
• https://github.com/typelevel/jawn/security/advisories/GHSA-vc89-hccf-rq55
• https://github.com/typelevel/jawn/pull/390
• https://github.com/typelevel/jawn/security/advisories/GHSA-vc89-hccf-rq55

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