CVE-2026-59990
Jawn: Uncontrolled nesting depth in JSON parser
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
Description
Jawn is an open source JSON parser. Prior to 1.7.0, Jawn parse methods accept arbitrarily deep JSON array and object nesting without a depth limit, allowing a remote attacker who can submit untrusted JSON to grow parser contexts until the JVM heap is exhausted. The resulting java.lang.OutOfMemoryError is a fatal Scala error that is not ordinarily handled by scala.util.Try or cats.effect.IO, causing denial of service. 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)
- 0.61% · top 50% 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 packages
From reviewed advisories of the GitHub Advisory Database.
- Mavenorg.typelevel:jawn-parser_2.12GHSA-cc4v-rvgp-2pf3 (opens in a new tab)
- Mavenorg.typelevel:jawn-parser_2.13GHSA-cc4v-rvgp-2pf3 (opens in a new tab)
- Mavenorg.typelevel:jawn-parser_3GHSA-cc4v-rvgp-2pf3 (opens in a new tab)
References (6)
- https://github.com/typelevel/jawn/security/advisories/GHSA-cc4v-rvgp-2pf3 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/typelevel/jawn/commit/191cb3a44e77f1afab439ee636bf66bdf3c54a04 (opens in a new tab)x_refsource_MISC
- https://github.com/typelevel/jawn/commit/6219666641f9408498f85868f835e17bd8a72fed (opens in a new tab)x_refsource_MISC
- https://github.com/typelevel/jawn/commit/93ac93e9c992c11b4c03d5455d8551f9fb24da1b (opens in a new tab)x_refsource_MISC
- https://github.com/typelevel/jawn/commit/f6ace7e0db715de1a8c4618bed9378333a5c2214 (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-cc4v-rvgp-2pf3 (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-2026-59990)Record last updated .