CVE-2026-55962
- Source
- https://cve.org/CVERecord?id=CVE-2026-55962
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55962.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-55962
- Downstream
- Published
- 2026-06-25T21:12:38Z
- Modified
- 2026-10-28T02:30:47Z
- Severity
-
- 6.0 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator
- Summary
- TLS 1.3 post-handshake authentication: server accepts Finished without client Certificate/CertificateVerify
- Details
-
TLS 1.3 post-handshake authentication (PHA) issue where a server could accept a client's Finished message without the client having sent a Certificate and CertificateVerify. The post-handshake-auth exemption that allows an empty/absent peer certificate was only intended for the initial handshake, but it was also being applied while a post-handshake CertificateRequest was still outstanding. The check is now scoped to the initial handshake only: on the server, once a post-handshake CertificateRequest has been sent (certReqCtx is set), a peer certificate and a valid CertificateVerify are required again before the Finished is accepted, with empty-certificate handling following the configured verify mode (FAIL_IF_NO_PEER_CERT) just as during first-handshake client authentication. Only affects TLS 1.3 servers built with post-handshake authentication support (WOLFSSL_POST_HANDSHAKE_AUTH / --enable-postauth, included in --enable-all) that enable WOLFSSL_VERIFY_POST_HANDSHAKE and request a client certificate after the handshake via wolfSSL_request_certificate(). Clients, and servers that do not use post-handshake authentication, are unaffected.
- Database specific
{ "cna_assigner": "wolfSSL", "cwe_ids": [ "CWE-287" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55962.json" }- References
Affected packages
Git / github.com/wolfssl/wolfssl
Affected ranges
- Type
- GIT
- Repo
- https://github.com/wolfssl/wolfssl
- Events
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "5.5.4" }, { "last_affected": "5.9.1" } ], "source": "AFFECTED_FIELD", "strategy": "StandardRange" }, { "cpe": "cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*", "range": [ { "introduced": "5.5.4" }, { "fixed": "5.9.2" } ], "source": "CPE_RANGE" } ] }