CVE-2026-103649

Missing network timeouts in the Linux builds of Progressive Robot hMailServer 6.3.0 through 6.3.5 allow a remote attacker to hold server threads indefinitely and so stop outbound mail delivery denial of service. The server set its socket timeouts in the form Windows takes, which Linux refuses, an...

EUVD-2026-94835

Missing network timeouts in the Linux builds of Progressive Robot hMailServer 6.3.0 through 6.3.5 allow a remote attacker to hold server threads indefinitely and so stop outbound mail delivery denial of service. The server set its socket timeouts in the form Windows takes, which Linux refuses, an...

CVE-2026-103649

Linux builds of Progressive Robot hMailServer versions 6.3.0 through 6.3.5 are vulnerable to a denial of service (DoS) due to missing network timeouts. The root cause is that the server sets socket timeouts in a Windows-specific format which Linux rejects, causing HTTPS clients to read without a ...

CVE-2026-103649 Synchronous Access of Remote Resource without Timeout in hMailServer

Missing network timeouts in the Linux builds of Progressive Robot hMailServer 6.3.0 through 6.3.5 allow a remote attacker to hold server threads indefinitely and so stop outbound mail delivery denial of service. The server set its socket timeouts in the form Windows takes, which Linux refuses, an...