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Vulnerability record · CVE-2026-61814 · published 23 September 2026

CVE-2026-61814: Uncontrolled resource consumption vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.57% · top 55.2% CWE-400 · Uncontrolled resource consumptionCWE-407 · CWE-407 Received
7.5CVSS 3.1 base score
0.57%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
23 Sep 2026Last modified by NVD

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.

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

References

LinkTags
https://github.com/typelevel/jawn/commit/cddcd5e3387c356b05953f7b2af103d309687e4b
https://github.com/typelevel/jawn/releases/tag/v1.7.0
https://github.com/typelevel/jawn/security/advisories/GHSA-w4cm-gvhj-cgw6

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Source: NIST National Vulnerability Database (record CVE-2026-61814), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.