CVE-2025-11936
Medium
Description
Improper input validation in the TLS 1.3 KeyShareEntry parsing in wolfSSL v5.8.2 on multiple platforms allows a remote unauthenticated attacker to cause a denial-of-service by sending a crafted ClientHello message containing duplicate KeyShareEntry values for the same supported group, leading to excessive CPU and memory consumption during ClientHello processing.
SeverityMedium
CVSS5.3
Exploit probability—
ProductWolfssl
PublishedNov 21, 2025
First seenNov 21, 2025
Weakness typeCWE-20Improper input validation
How to fix
Update
- wolfssl wolfssl5.8.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| wolfssl wolfssl | 5.8.2 ≤ v < 5.8.4 | 5.8.4 |
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