Ruby JWT Library Empty-key HMAC Bypass Vulnerability (CVE-2026-4363)
Security Advisory
CVE-2026-4363
Critical
ruby-jwt
Affected:
- ruby-jwt >= 3.0.0, < 3.2.0
- ruby-jwt < 2.10.3
Fixed in:
- 3.2.0
- 2.10.3
Referenced CVEs:
CVE-2026-45363 · 9.1
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