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High, CVSS 7.5amended

Jawn: Quadratic parsing effort in AsyncParser

CVE-2026-61814GHSA-w4cm-gvhj-cgw6

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (org.typelevel:jawn-parser_2.13 1.7.0; org.typelevel:jawn-parser_2.12 1.7.0; org.typelevel:jawn-parser_3 1.7.0), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2026-61814: 0.75% estimated exploitation activity in the next 30 days; percentile 55.02 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

AsyncParser can be forced to perform O(n^2) work on the length of the input. When a single JSON token arrives across many small chunks, each absorb call rescans the incomplete token from the start. Impact Denial of service via CPU exhaustion when parsing untrusted JSON. Preconditions: - Application uses AsyncParser - Attacker can send large tokens with control over chunk sizes. Patches Fixed in jawn-parser-1.7.0. Workarounds If you can't upgrade immediately: - Use the synchronous Parser. - Buffer incoming bytes into larger chunks before calling absorb

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-w4cm-gvhj-cgw6

  2. Revision 1 · created ·

    Published from osv record GHSA-w4cm-gvhj-cgw6

Agent brief

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# Patch Next advisory brief: CVE-2026-61814

Advisory: Jawn: Quadratic parsing effort in AsyncParser
IDs: CVE-2026-61814, GHSA-w4cm-gvhj-cgw6
Record: https://patchnext.com/advisories/cve-2026-61814 (revision 2, source checked 26 Oct 2026, 16:55 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.typelevel:jawn-parser_2.13 1.7.0; org.typelevel:jawn-parser_2.12 1.7.0; org.typelevel:jawn-parser_3 1.7.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.typelevel:jawn-parser_2.13: affected <= 1.6.0; fixed in 1.7.0
- Maven org.typelevel:jawn-parser_2.12: affected <= 1.6.0; fixed in 1.7.0
- Maven org.typelevel:jawn-parser_3: affected <= 1.6.0; fixed in 1.7.0

## Suggested inspection (read-only)
- Maven org.typelevel:jawn-parser_2.13: check the installed version with your package manager.
- Maven org.typelevel:jawn-parser_2.12: check the installed version with your package manager.
- Maven org.typelevel:jawn-parser_3: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.typelevel:jawn-parser_2.13, org.typelevel:jawn-parser_2.12, org.typelevel:jawn-parser_3.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-w4cm-gvhj-cgw6 (OSV record GHSA-w4cm-gvhj-cgw6 lists affected ranges: Maven org.typelevel:jawn-parser_2.12 >=0 =0 =0 <1.7.0 (fixed))
- Verified: https://github.com/advisories/GHSA-w4cm-gvhj-cgw6 (GitHub-reviewed advisory GHSA-w4cm-gvhj-cgw6 lists affected ranges: Maven org.typelevel:jawn-parser_2.12 >=0 =0 =0 <=1.6.0)

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