GHSA-vc89-hccf-rq55 is a medium-severity (CVSS 5.9) Uncontrolled Resource Consumption vulnerability in org.typelevel:jawn-parser_0.25. 1 public exploit reference exists, so weaponization risk is real. O3 Security confirms whether GHSA-vc89-hccf-rq55 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
Hash collision in typelevel jawn
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
Exploitation and automatability from CISA’s SSVC triage for GHSA-vc89-hccf-rq55.
EPSS Exploitation Probability
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.
How urgent is this, really
GHSA-vc89-hccf-rq55 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 0 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
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 moreReal-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
Impact
Extenders of the org.typelevel.jawn.SimpleFacade and org.typelevel.jawn.MutableFacade who don't override objectContext() are vulnerable to a hash collision attack. Most applications do not implement these traits directly, but inherit from a library:
Affected implementations include:
org.http4s::http4s-play-jsonorg.typelevel :: jawn-ast(< 0.8.0)org.typelevel :: jawn-play(discontinued)org.typelevel :: jawn-rojoma(discontinued)org.typelevel :: jawn-spray(discontinued)
Unaffected implementations include:
io.argonaut :: argonaut-jawnio.circe :: circe-parserorg.typelevel :: jawn-ast(>= 0.8.0)org.typelevel :: jawn-json4s(discontinued)org.typelevel :: jawn-argonaut(discontinued)
Patches
jawn-parser-1.3.2 fixes the issue.
Workarounds
Override objectContext() to use a collision-safe collection. See the patch for an example in both SimpleFacade and MutableFacade.
References
Credits
- @kag0, for the report and the patch
For more information
If you have any questions or comments about this advisory:
- Open an issue in typelevel/jawn
- E-mail a maintainer:
Affected Packages
| 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 |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
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 GHSA-vc89-hccf-rq55 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 GHSA-vc89-hccf-rq55 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 GHSA-vc89-hccf-rq55. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-vc89-hccf-rq55 in your dependencies?
O3 detects GHSA-vc89-hccf-rq55 across Maven dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.