CVE-2026-61814

Jawn: Quadratic parsing effort in AsyncParser

State: Published
Severity: 7.5 High
Published: Sep 23, 2026
Updated: Sep 23, 2026
Reserved: Jul 10, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-400 Uncontrolled Resource Consumption
CWE-407 Inefficient Algorithmic Complexity

Affected Products

Product	Versions
jawntypelevel	< 1.7.0Affected
jawn-parser_2.12org.typelevel	< 1.7.0Affected
jawn-parser_2.13org.typelevel	< 1.7.0Affected
jawn-parser_3org.typelevel	< 1.7.0Affected

References

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