Jawn: Uncontrolled nesting depth in JSON parser

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-59990
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-23 19:17:32 UTC
Updated2026-09-30 17:32:07 UTC
DescriptionJawn 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.006150000 probability, percentile 0.491540000 (date 2026-10-25)

Problem Types: CWE-770 | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Typelevel Jawn affected < 1.7.0 Not specified

References

ReferenceSourceLinkTags
github.com/typelevel/jawn/security/advisories/GHSA-cc4v-rvgp-2pf3 [email protected] github.com
github.com/typelevel/jawn/commit/f6ace7e0db715de1a8c4618bed9378333a5c2214 [email protected] github.com
github.com/typelevel/jawn/commit/6219666641f9408498f85868f835e17bd8a72fed [email protected] github.com
github.com/typelevel/jawn/releases/tag/v1.7.0 [email protected] github.com
github.com/typelevel/jawn/commit/191cb3a44e77f1afab439ee636bf66bdf3c54a04 [email protected] github.com
github.com/typelevel/jawn/commit/93ac93e9c992c11b4c03d5455d8551f9fb24da1b [email protected] github.com
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