How severe is CVE-2022-21653?

CVE-2022-21653 has a CVSS score of 5.9/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2022-21653?

CVE-2022-21653 affects the following packages: org.typelevel:jawn-parser_0.25 (Maven), org.typelevel:jawn-parserg (Maven), org.typelevel:jawn-parser_0.27 (Maven), org.typelevel:jawn-parser_2.10 (Maven), org.typelevel:jawn-parser_2.11 (Maven), org.typelevel:jawn-parser_2.12 (Maven), org.typelevel:jawn-parser_2.13 (Maven), org.typelevel:jawn-parser_2.13.0-M5 (Maven), and 10 more. Ecosystems affected: Maven.

How do I fix CVE-2022-21653?

No patched version of org.typelevel:jawn-parser_0.25 has shipped for CVE-2022-21653 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

How do I detect CVE-2022-21653 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.typelevel:jawn-parser_0.25. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

How do I mitigate CVE-2022-21653 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against CVE-2022-21653?

O3 pinpoints whether CVE-2022-21653 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Is CVE-2022-21653 actively exploited in the wild?

Yes. There are 1 known exploit references for CVE-2022-21653, including 1 in-the-wild exploitation observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2022-21653?

CVE-2022-21653 has an EPSS (Exploit Prediction Scoring System) score of 0.8%, placing it in the 52th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

When was CVE-2022-21653 published, and has it been updated?

CVE-2022-21653 was published on January 5, 2022 and was last updated on April 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕ Maven

CVE-2022-21653

MEDIUM

Hash collision in typelevel jawn

Also known asGHSA-vc89-hccf-rq55

Published

Jan 5, 2022

Updated

Apr 10, 2026

Affected

18 pkgs

Patched

3 / 18

Exploits

1 known

EPSS Exploitation Probability

via FIRST.org ↗

0.8%probability of exploitation in next 30 days

Lower Risk52th percentile+0.65%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Blast Radius

18 pkgs affected

☕org.typelevel:jawn-parser_0.25☕org.typelevel:jawn-parserg☕org.typelevel:jawn-parser_0.27☕org.typelevel:jawn-parser_2.10☕org.typelevel:jawn-parser_2.11☕org.typelevel:jawn-parser_2.12☕org.typelevel:jawn-parser_2.13☕org.typelevel:jawn-parser_2.13.0-M5+10 more

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

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 Packages

18 total 3 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.typelevel:jawn-parser_0.25`	all versions	No fix
☕Maven	`org.typelevel:jawn-parserg`	all versions	No fix
☕Maven	`org.typelevel:jawn-parser_0.27`	all versions	No fix
☕Maven	`org.typelevel:jawn-parser_2.10`	all versions	No fix
☕Maven	`org.typelevel:jawn-parser_2.11`	all versions	No fix
☕Maven	`org.typelevel:jawn-parser_2.12`	all versions	1.3.2

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

Jawn is an open source JSON parser. Extenders of the `org.typelevel.jawn…

github.comNVDJan 2022

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.typelevel:jawn-parser_0.25. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
No patched version of org.typelevel:jawn-parser_0.25 has shipped for CVE-2022-21653 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether CVE-2022-21653 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to CVE-2022-21653. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

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.

O3 Security · Impact-Aware SCA

Is CVE-2022-21653 in your dependencies?

O3 detects CVE-2022-21653 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my dependencies How O3 SCA works