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Vulnerability · Published Sep 23, 2026 · Assigned by GitHub_M

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

High 7.5

In plain English

A high-severity uncontrolled resource consumption in jawn-parser_2.12 from org.typelevel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 55% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.8%top 44.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12jawnno fix listedDEBIAN-CVE-2026-61814
Debian:13jawnno fix listedDEBIAN-CVE-2026-61814
Debian:14jawnno fix listedDEBIAN-CVE-2026-61814
Mavenorg.typelevel:jawn-parser_2.121.7.0GHSA-w4cm-gvhj-cgw6
Mavenorg.typelevel:jawn-parser_2.131.7.0GHSA-w4cm-gvhj-cgw6
Mavenorg.typelevel:jawn-parser_31.7.0GHSA-w4cm-gvhj-cgw6
Ubuntu:22.04:LTSjawnno fix listedUBUNTU-CVE-2026-61814
Ubuntu:24.04:LTSjawnno fix listedUBUNTU-CVE-2026-61814
Ubuntu:26.04:LTSjawnno fix listedUBUNTU-CVE-2026-61814
Ubuntu:26.10jawnno fix listedUBUNTU-CVE-2026-61814

Affected products (as reported)

VendorProductVersions
typelevel jawn < 1.7.0
org.typelevel jawn-parser_2.12 < 1.7.0
org.typelevel jawn-parser_2.13 < 1.7.0
org.typelevel jawn-parser_3 < 1.7.0

Weakness: CWE-400, CWE-407 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References