CVE-2026-61814

Jawn: Quadratic parsing effort in AsyncParser

Published Sep 23, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
Jawn 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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-w4cm-gvhj-cgw6 Jawn: Quadratic parsing effort in AsyncParser
History
Type Values Removed Values Added
First Time appeared Org.typelevel
Org.typelevel jawn-parser 2.12
Org.typelevel jawn-parser 2.13
Org.typelevel jawn-parser 3
Typelevel
Typelevel jawn
Vendors & Products Org.typelevel
Org.typelevel jawn-parser 2.12
Org.typelevel jawn-parser 2.13
Org.typelevel jawn-parser 3
Typelevel
Typelevel jawn
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Jawn 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.
Title Jawn: Quadratic parsing effort in AsyncParser
Weaknesses CWE-400
CWE-407
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Sep 23, 2026, 7:41 PM
Reserved
Jul 10, 2026, 8:17 PM
Status
Deferred
Published
Sep 23, 2026, 7:17 PM
Modified
Sep 30, 2026, 5:32 PM