Jawn: Quadratic parsing effort in AsyncParser

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-61814
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's AsyncParser can perform quadratic work when a single JSON token is delivered across many small chunks because each absorb call rescans the incomplete token from the start. A remote attacker who controls untrusted JSON input and its chunk sizes can exhaust CPU resources and cause denial of service in applications using AsyncParser. 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: 0.007500000 probability, percentile 0.546790000 (date 2026-10-25)

Problem Types: CWE-400 | CWE-407 | CWE-400 CWE-400: Uncontrolled Resource Consumption | CWE-407 CWE-407: Inefficient Algorithmic Complexity

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
CNA Org.typelevel Jawn-parser 2.12 affected < 1.7.0 Not specified
CNA Org.typelevel Jawn-parser 2.13 affected < 1.7.0 Not specified
CNA Org.typelevel Jawn-parser 3 affected < 1.7.0 Not specified

References

ReferenceSourceLinkTags
github.com/typelevel/jawn/commit/cddcd5e3387c356b05953f7b2af103d309687e4b [email protected] github.com
github.com/typelevel/jawn/security/advisories/GHSA-w4cm-gvhj-cgw6 [email protected] github.com
github.com/typelevel/jawn/releases/tag/v1.7.0 [email protected] github.com
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