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TI-2026-44239 Aliases CVE-2026-61814GHSA-w4cm-gvhj-cgw6

Jawn: Quadratic parsing effort in AsyncParser

Priority MEDIUM 40CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0075 55th percentileScored 2026-11-07
Fix Fixed jawn (typelevel): 1.7.0jawn-parser_2.12 (org.typelevel): 1.7.0+5 more products

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
http4sjawnbefore 1.7.01.7.0Patch availableCNA
org.typeleveljawn-parser_2.12before 1.7.01.7.0Patch availableCNA
org.typeleveljawn-parser_2.13before 1.7.01.7.0Patch availableCNA
org.typeleveljawn-parser_3before 1.7.01.7.0Patch availableCNA
—org.typelevel:jawn-parser_2.12 (Maven)before 1.7.01.7.0Patch availableGHSA-w4cm-gvhj-cgw6
—org.typelevel:jawn-parser_2.13 (Maven)before 1.7.01.7.0Patch availableGHSA-w4cm-gvhj-cgw6
—org.typelevel:jawn-parser_3 (Maven)before 1.7.01.7.0Patch availableGHSA-w4cm-gvhj-cgw6
  • jawn Vendorhttp4s Affected before 1.7.0 Fixed in 1.7.0 Patch available CNA
  • jawn-parser_2.12 Vendororg.typelevel Affected before 1.7.0 Fixed in 1.7.0 Patch available CNA
  • jawn-parser_2.13 Vendororg.typelevel Affected before 1.7.0 Fixed in 1.7.0 Patch available CNA
  • jawn-parser_3 Vendororg.typelevel Affected before 1.7.0 Fixed in 1.7.0 Patch available CNA
  • org.typelevel:jawn-parser_2.12 (Maven) Vendor— Affected before 1.7.0 Fixed in 1.7.0 Patch available GHSA-w4cm-gvhj-cgw6
  • org.typelevel:jawn-parser_2.13 (Maven) Vendor— Affected before 1.7.0 Fixed in 1.7.0 Patch available GHSA-w4cm-gvhj-cgw6
  • org.typelevel:jawn-parser_3 (Maven) Vendor— Affected before 1.7.0 Fixed in 1.7.0 Patch available GHSA-w4cm-gvhj-cgw6

Remediation

  • Fix · CNA jawn (typelevel) Fixed in 1.7.0
  • Fix · CNA jawn-parser_2.12 (org.typelevel) Fixed in 1.7.0
  • Fix · CNA jawn-parser_2.13 (org.typelevel) Fixed in 1.7.0
  • Fix · CNA jawn-parser_3 (org.typelevel) Fixed in 1.7.0
  • Fix · GHSA-w4cm-gvhj-cgw6 org.typelevel:jawn-parser_2.12 (Maven) Fixed in 1.7.0 Advisory →
  • Fix · GHSA-w4cm-gvhj-cgw6 org.typelevel:jawn-parser_2.13 (Maven) Fixed in 1.7.0 Advisory →
  • Fix · GHSA-w4cm-gvhj-cgw6 org.typelevel:jawn-parser_3 (Maven) Fixed in 1.7.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-61814
  2. 2026-10-03 Alias added: GHSA-w4cm-gvhj-cgw6
  3. 2026-10-25 EPSS moved to the 50th–90th percentile

References

Other 4

  • TI-2022-13223 mTLS client verification is skipped in fs2 on Node.js CVSS 3.1CRITICAL 9.8
  • TI-2023-08714 Http4s has fatal error parsing User-Agent and Server headers CVSS 3.1HIGH 7.5
  • TI-2022-06031 Hash collision in typelevel jawn CVSS 3.1HIGH 7.5
  • TI-2025-37261 Http4s vulnerable to HTTP Request Smuggling due to improper handling of HTTP trailer section CVSS 4.0MEDIUM 6.3
  • TI-2026-44185 http4s-scala-xml has an XML External Entity (XXE) processing issue CVSS 3.1CRITICAL 9.3
  • TI-2020-04336 Local file inclusion vulnerability in http4s CVSS 3.1HIGH 7.6
See all 36 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences