What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-23 · updated 2026-09-30
• Weakness: CWE-400

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 products

• org.typelevel jawn-parser_2.12: before 1.7.0
• org.typelevel jawn-parser_2.13: before 1.7.0
• org.typelevel jawn-parser_3: before 1.7.0
• typelevel jawn: before 1.7.0

References

• 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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