
Critical OpenSSL DTLS Vulnerability Exposes Heap Memory in Encrypted Communications
OpenSSL disclosed CVE-2026-84782, a high-severity vulnerability in DTLS (Datagram Transport Layer Security) that can leak heap memory unencrypted or crash applications. The flaw occurs when DTLS handshake message resends trigger while larger messages are partially transmitted, causing wrong message labels and potential buffer overruns. Fixed in OpenSSL 4.0.3, 3.6.5, 3.5.9, and 3.4.8, the vulnerability affects all prior versions across multiple branches, with older versions requiring premium support for patches. This vulnerability highlights the ongoing risks in foundational cryptographic libraries that secure internet communications, particularly as organizations increasingly rely on encrypted protocols for WebRTC, VoIP, and real-time communications across hybrid and multi-cloud environments.
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