What’s Vulnerable › Vulnerabilities
CVE-2026-3230: Improper key_share validation in TLS 1.3 HelloRetryRequest
- Severity: low (CVSS 2.7 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-19 · updated 2026-06-17
- Weakness: CWE-20
Description
Missing required cryptographic step in the TLS 1.3 client HelloRetryRequest handshake logic in wolfSSL could lead to a compromise in the confidentiality of TLS-protected communications via a crafted HelloRetryRequest followed by a ServerHello message that omits the required key_share extension, resulting in derivation of predictable traffic secrets from (EC)DHE shared secret. This issue does not affect the client's authentication of the server during TLS handshakes.
Affected products
- wolfSSL: before 5.9.0 — fixed in 5.9.0
How to fix
Upgrade to a fixed version: wolfSSL 5.9.0. Check the vendor advisory for mitigations.
References
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