CVE-2026-63462

HIGHPre-NVD 7.57.5
EchelonGraph scoreLOW confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). 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: secondary
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 7.5Exploit: None knownExposed: 0

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

Unleash is an open-source feature management platform. Prior to 7.5.2, 7.6.5, and 8.0.2, the shared OpenAPI validation error path in src/lib/error/bad-data-error.ts passes a raw request value from lodash.get to JSON.stringify in genericErrorMessage and fromOpenApiValidationErrors without guarding stack exhaustion. An unauthenticated attacker can send a roughly 10 KB JSON value nested thousands of levels deep to POST /edge/validate, POST /edge/issue-token, or another OpenAPI-validated endpoint, causing RangeError: Maximum call stack size exceeded in openAPIValidationMiddleware and terminating the Node process because no uncaughtException handler recovers it. Replaying the request can sustain a complete service outage. This issue is fixed in versions 7.5.2, 7.6.5, and 8.0.2.

CVSS v3
7.5
EG Score
7.5(low)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
—
EPSS %ILE
—
KEV
Not listed

Published

August 21, 2026

Last Modified

August 21, 2026

Advisory Details (7)

Auto-updated Aug 21, 2026
Patch available. Sources: github, github_commit, github_release.
github_release Patch Available

v8.0.2

Patch available: Unleash/unleash v8.0.2

https://github.com/Unleash/unleash/releases/tag/v8.0.2
github_release Patch Available

v7.6.5

Patch available: Unleash/unleash v7.6.5

https://github.com/Unleash/unleash/releases/tag/v7.6.5
github_release Patch Available

v7.5.2

Patch available: Unleash/unleash v7.5.2

https://github.com/Unleash/unleash/releases/tag/v7.5.2
github_commit Patch Available

commit d862562a5ab8 (Unleash/unleash)

Patch available: Unleash/unleash v7.5.2 (contains commit d862562a5ab8)

https://github.com/Unleash/unleash/commit/d862562a5ab8f2d1e40f6519c64cf0b4fdaf806d
github_commit Patch Available

commit d45f99df924c (Unleash/unleash)

Patch available: Unleash/unleash v7.6.5 (contains commit d45f99df924c)

https://github.com/Unleash/unleash/commit/d45f99df924c0d24747b3e45e46fcda7dcd3c1c1
github_commit Patch Available

commit b0e4da63249a (Unleash/unleash)

Patch available: Unleash/unleash v8.0.2 (contains commit b0e4da63249a)

https://github.com/Unleash/unleash/commit/b0e4da63249a9403bc209e0581db223326cb8dcf
github Patch Available

Unauthenticated single-request DoS via OpenAPI validation error formatter · Advisory · Unleash/unleash · GitHub

https://github.com/Unleash/unleash/security/advisories/GHSA-r5pq-6chh-j3xp

Vendor Advisories for CVE-2026-63462(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 3× in last 7d / 3× 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. 2026-08-21 19:22 UTCEG score recompute
  2. 2026-08-21 18:19 UTCEG score recompute
  3. 2026-08-21 18:19 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2026-63462?
CVE-2026-63462 is a high vulnerability published on August 21, 2026. Unleash is an open-source feature management platform. Prior to 7.5.2, 7.6.5, and 8.0.2, the shared OpenAPI validation error path in src/lib/error/bad-data-error.ts passes a raw request value from lodash.get to JSON.stringify in genericErrorMessage and fromOpenApiValidationErrors without guarding…
When was CVE-2026-63462 disclosed?
CVE-2026-63462 was first published in the National Vulnerability Database on August 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-63462?
CVE-2026-63462 has a CVSS v3 base score of 7.5 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-63462?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-63462, 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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