CVE-2026-61814
Jawn: Quadratic parsing effort in AsyncParser
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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.
Timeline
ID reserved
By GitHub_M
- 3 months later
· 3 months later
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Deferred | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.75% · top 45% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Weakness
Affected products
- affected < 1.7.0
org.typelevel · jawn-parser_2.12
- affected < 1.7.0
org.typelevel · jawn-parser_2.13
- affected < 1.7.0
- affected < 1.7.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Mavenorg.typelevel:jawn-parser_2.12GHSA-w4cm-gvhj-cgw6 (opens in a new tab)
- Mavenorg.typelevel:jawn-parser_2.13GHSA-w4cm-gvhj-cgw6 (opens in a new tab)
- Mavenorg.typelevel:jawn-parser_3GHSA-w4cm-gvhj-cgw6 (opens in a new tab)
References (3)
- https://github.com/typelevel/jawn/security/advisories/GHSA-w4cm-gvhj-cgw6 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/typelevel/jawn/commit/cddcd5e3387c356b05953f7b2af103d309687e4b (opens in a new tab)x_refsource_MISC
- https://github.com/typelevel/jawn/releases/tag/v1.7.0 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-w4cm-gvhj-cgw6 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-61814)Record last updated .