OpenSSL 4.1.0: What’s new, what’s removed, and what’s still broken

As cited

Copy frozen at 2026-10-26 13:57 UTC (site build).

vulnerabilities

OpenSSL 4.1.0: What’s new, what’s removed, and what’s still broken

OpenSSL released version 4.1.0 with support for Datagram Transport Layer Security (DTLS) 1.3, a TLS variant for datagram transports such as User Datagram Protocol (UDP) defined in RFC 9147. The release ships with four known bugs in the DTLS code that can cause applications to misread connections, affecting developers who adopt DTLS 1.3 or use the newly added DTLS support in OpenSSL's Secure Sockets Layer (SSL) listener application programming interface (API).

Why it matters: Developers integrating DTLS 1.3 or the new SSL listener API must account for these known bugs before deploying to production, as misreading connections could degrade security or availability.

Source published

2026-10-25 23:33 UTC

First seen by Cybersecurity Tracker

2026-10-26 01:02 UTC