CVE-2026-61814: CWE-400: Uncontrolled Resource Consumption in typelevel jawn
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.
AI Analysis
Technical Summary
CVE-2026-61814 describes an uncontrolled resource consumption vulnerability (CWE-400) in the AsyncParser component of the typelevel Jawn JSON parser. Versions prior to 1.7.0 are affected because each absorb call rescans the incomplete token from the start, resulting in quadratic CPU work when a token is fragmented into many small chunks. A remote attacker who controls the JSON input and chunk sizes can exploit this behavior to exhaust CPU resources and cause a denial of service in applications using AsyncParser. The vulnerability has a CVSS 3.1 score of 7.5 (high severity) and is fixed in version 1.7.0.
Potential Impact
An attacker can cause denial of service by exhausting CPU resources through carefully crafted JSON input chunking. This impacts availability of applications using vulnerable versions of AsyncParser in Jawn. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Upgrade to Jawn version 1.7.0 or later, where this issue is fixed. No other mitigations are indicated or required.
CVE-2026-61814: CWE-400: Uncontrolled Resource Consumption in typelevel jawn
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 v3.1
Score 7.5high
Affected software
typelevel
jawn
org.typelevel
jawn-parser_2.12
org.typelevel
jawn-parser_2.13
org.typelevel
jawn-parser_3
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-61814 describes an uncontrolled resource consumption vulnerability (CWE-400) in the AsyncParser component of the typelevel Jawn JSON parser. Versions prior to 1.7.0 are affected because each absorb call rescans the incomplete token from the start, resulting in quadratic CPU work when a token is fragmented into many small chunks. A remote attacker who controls the JSON input and chunk sizes can exploit this behavior to exhaust CPU resources and cause a denial of service in applications using AsyncParser. The vulnerability has a CVSS 3.1 score of 7.5 (high severity) and is fixed in version 1.7.0.
Potential Impact
An attacker can cause denial of service by exhausting CPU resources through carefully crafted JSON input chunking. This impacts availability of applications using vulnerable versions of AsyncParser in Jawn. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Upgrade to Jawn version 1.7.0 or later, where this issue is fixed. No other mitigations are indicated or required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-10T20:17:57.991Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ab42d0af7a7c541063f0e52
Added to database: 09/23/2026, 19:48:26 UTC
Last enriched: 09/23/2026, 20:04:41 UTC
Last updated: 09/24/2026, 01:57:04 UTC
Views: 5
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