High 7.5Published Sep 23, 2026

CVE-2026-61814Jawn: Quadratic parsing effort in AsyncParser

Updated under an hour ago (2026-10-19 08:10 UTC)

Does this affect you?

It affects typelevel jawn and 3 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for typelevel jawn

Exploited in the last 30 days

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: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-400, CWE-407
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Sep 23, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

typelevel jawn typelevel:jawn (from the name)	before 1.7.0	CNA record
org.typelevel jawn-parser_2.12 org.typelevel:jawn_parser_2.12 (from the name)	before 1.7.0	CNA record
org.typelevel jawn-parser_2.13 org.typelevel:jawn_parser_2.13 (from the name)	before 1.7.0	CNA record
org.typelevel jawn-parser_3 org.typelevel:jawn_parser_3 (from the name)	before 1.7.0	CNA record

References

https://github.com/typelevel/jawn/security/advisories/GHSA-w4cm-gvhj-cgw6x-refsource-confirm
https://github.com/typelevel/jawn/commit/cddcd5e3387c356b05953f7b2af103d309687e4bx-refsource-misc
https://github.com/typelevel/jawn/releases/tag/v1.7.0x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.