Resource exhaustion in Typelevel Jawn
CVE-2026-59990
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (49.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: -0.000
Affected products
- Typelevel Jawn — versions < 1.7.0
Weakness classification (CWE)
References
- github.com/typelevel/jawn/security/advisories/GHSA-cc4v-rvgp-2pf3
- github.com/typelevel/jawn/commit/191cb3a44e77f1afab439ee636bf66bdf3c54a04
- github.com/typelevel/jawn/commit/6219666641f9408498f85868f835e17bd8a72fed
- github.com/typelevel/jawn/commit/93ac93e9c992c11b4c03d5455d8551f9fb24da1b
- github.com/typelevel/jawn/commit/f6ace7e0db715de1a8c4618bed9378333a5c2214
- github.com/typelevel/jawn/releases/tag/v1.7.0
Frequently asked questions
- What is CVE-2026-59990?
- CVE-2026-59990 is a high-severity vulnerability in Typelevel Jawn, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-09-23.
- How severe is CVE-2026-59990?
- High severity. CVSS v3 base score is 7.5 out of 10.