Improperly Configured Intermediate CA in WolfSSL
CVE-2026-55964

6.3MEDIUM

Key Information:

Vendor

Wolfssl

Status
Wolfssl
Vendor
CVE Published:
25 June 2026

What is CVE-2026-55964?

An improper configuration allows intermediate CA certificates to assert keyCertSign capabilities without actually having the necessary key usage due to exemptions previously applied to temporary CAs. This opens a potential path for misuse in certificate signing processes. The new enforcement now applies universally, ensuring stricter validation for chain-supplied temporary CAs while maintaining exemptions for operator-loaded root certificates and self-signed roots. This improves compliance with RFC 5280 and enhances the security profile of connecting applications.

Affected Version(s)

wolfSSL 5.7.4 <= 5.9.1

References

https://github.com/wolfSSL/wolfssl/pull/10702
patch
https://www.wolfssl.com/docs/security-vulnerabilities/

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

NVIDIA Project Vanessa
.