TLS endpoint impersonation via missing hostname verification
Published May 5, 2026 · Updated Aug 26, 2026
Certificate validation in Apache Thrift before 0.23.0 allows man-in-the-middle attackers to impersonate trusted TLS endpoints. The Java TSSLTransportFactory createClient method creates an SSLSocket without enabling endpoint identification, so the handshake accepts a trusted certificate whose CN or SAN does not match the requested host. Network-positioned attackers with a certificate trusted by the client can intercept or alter Thrift RPC traffic; other language bindings are not identified as affected.
Summary
What happened
Certificate validation in Apache Thrift before 0.23.0 allows man-in-the-middle attackers to impersonate trusted TLS endpoints. The Java TSSLTransportFactory createClient method creates an SSLSocket without enabling endpoint identification, so the handshake accepts a trusted certificate whose CN or SAN does not match the requested host. Network-positioned attackers with a certificate trusted by the client can intercept or alter Thrift RPC traffic; other language bindings are not identified as affected.
The record
- CVE
- CVE-2026-43869
- Published
- May 5, 2026
- Updated
- Aug 26, 2026
- Vendor
- 389 Directory Server
- Product
- Red Hat OpenShift Distributed Tracing
- Classifications
- CWE-295, CWE-297, T1557
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 5, 2026CVE publishedPublication date reported by the CVE source.
- Aug 26, 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?
Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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