CVE-2026-84782

A flaw was found in OpenSSL. The Datagram Transport Layer Security (DTLS) retransmission mechanism fails to properly handle handshake message writes that are suspended before completion. A remote attacker could exploit this vulnerability during handshake message retransmission, causing OpenSSL to read past the message buffer or overwrite internal state required to resume writing. This issue can result in information disclosure through out-of-bounds memory reads or cause a Denial of Service (DoS) by crashing the process.

This vulnerability is rated as an Important severity because an unauthenticated network adversary can trigger process crashes or memory exposure without requiring local system privileges. Red Hat Enterprise Linux utilizes OpenSSL as the fundamental cryptographic provider across the operating system; however, overall exposure is limited because the flaw strictly affects software using Datagram Transport Layer Security (DTLS) over UDP under non-blocking I/O configurations. Standard TLS connections over TCP, which represent the typical deployment model for the majority of Red Hat workloads and system services, are unaffected.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.