CVE-2026-59990

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 52% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
48%
KEV
Not listed

Published

September 23, 2026

Last Modified

September 23, 2026

Advisory Details (6)

Auto-updated Sep 23, 2026
Patch available. Sources: github, github_commit, github_release.
github_release Patch Available

v1.7.0

Patch available: typelevel/jawn v1.7.0

https://github.com/typelevel/jawn/releases/tag/v1.7.0
github_commit Patch Available

commit f6ace7e0db71 (typelevel/jawn)

Patch available: typelevel/jawn v1.7.0 (contains commit f6ace7e0db71)

https://github.com/typelevel/jawn/commit/f6ace7e0db715de1a8c4618bed9378333a5c2214
github_commit Patch Available

commit 93ac93e9c992 (typelevel/jawn)

Patch available: typelevel/jawn v1.7.0 (contains commit 93ac93e9c992)

https://github.com/typelevel/jawn/commit/93ac93e9c992c11b4c03d5455d8551f9fb24da1b
github_commit Patch Available

commit 6219666641f9 (typelevel/jawn)

Patch available: typelevel/jawn v1.7.0 (contains commit 6219666641f9)

https://github.com/typelevel/jawn/commit/6219666641f9408498f85868f835e17bd8a72fed
github_commit Patch Available

commit 191cb3a44e77 (typelevel/jawn)

Patch available: typelevel/jawn v1.7.0 (contains commit 191cb3a44e77)

https://github.com/typelevel/jawn/commit/191cb3a44e77f1afab439ee636bf66bdf3c54a04
github Patch Available

Uncontrolled nesting depth in JSON parser · Advisory · typelevel/jawn · GitHub

https://github.com/typelevel/jawn/security/advisories/GHSA-cc4v-rvgp-2pf3

Vendor Advisories for CVE-2026-59990(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 7× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-24 21:26 UTCEG score recompute
  2. 2026-09-24 14:04 UTCEPSS rescore
  3. 2026-09-23 20:22 UTCEG score recompute
  4. 2026-09-23 19:39 UTCEG score recompute
  5. 2026-09-23 19:18 UTCEG score recompute
  6. 2026-09-23 18:49 UTCEG score recompute
  7. 2026-09-23 18:49 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-59990?
CVE-2026-59990 is a high vulnerability published on September 23, 2026. 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…
When was CVE-2026-59990 disclosed?
CVE-2026-59990 was first published in the National Vulnerability Database on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59990 actively exploited?
CVE-2026-59990 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 52.4% of all scored CVEs.
What is the CVSS score of CVE-2026-59990?
CVE-2026-59990 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-59990?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59990, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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