Certificate authentication bypass via masked signature failure
Published Sep 27, 2026 · Updated Sep 27, 2026
Certificate verification bypass in wolfSSL 3.15.5 through 5.9.2 allows remote attackers to authenticate with a forged certificate. In ProcessPeerCertParse(), a certificate parse error replaces the separately computed ASN_SIG_CONFIRM_E result, masking an invalid signature when date errors are overridden. Affected builds must define WOLFSSL_SMALL_CERT_VERIFY and use peer verification with a callback that accepts certificate date errors; otherwise the handshake fails.
Summary
What happened
Certificate verification bypass in wolfSSL 3.15.5 through 5.9.2 allows remote attackers to authenticate with a forged certificate. In ProcessPeerCertParse(), a certificate parse error replaces the separately computed ASN_SIG_CONFIRM_E result, masking an invalid signature when date errors are overridden. Affected builds must define WOLFSSL_SMALL_CERT_VERIFY and use peer verification with a callback that accepts certificate date errors; otherwise the handshake fails.
The record
- CVE
- CVE-2026-94418
- Published
- Sep 27, 2026
- Updated
- Sep 27, 2026
- Vendor
- wolfSSL
- Product
- wolfSSL
- Classifications
- T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 27, 2026CVE publishedPublication date reported by the CVE source.
- Sep 27, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=3.15.5 <=5.9.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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