What is CVE-2026-61814?

CVE-2026-61814 is a high-severity vulnerability in Org.typelevel Jawn-Parser 2.12, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-09-23.

How severe is CVE-2026-61814?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Org.typelevel Jawn-Parser 2.12

CVE-2026-61814

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.

Vulnerability class: DoS (Denial of Service)

Published 2026-09-23 · last modified 2026-09-30.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (55.0th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.007 · change: +0.002

Affected products

Org.typelevel Jawn-Parser 2.12 — versions < 1.7.0
Org.typelevel Jawn-Parser 2.13 — versions < 1.7.0
Org.typelevel Jawn-Parser 3 — versions < 1.7.0
Typelevel Jawn — versions < 1.7.0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-61814?: CVE-2026-61814 is a high-severity vulnerability in Org.typelevel Jawn-Parser 2.12, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-09-23.
How severe is CVE-2026-61814?: High severity. CVSS v3 base score is 7.5 out of 10.