EUVD-2026-94865

Improper certificate validation in the webmail of Progressive Robot hMailServer 6.3.2 through 6.3.5 allows a remote unauthenticated attacker to have S/MIME-encrypted mail that the account later sends to another correspondent also encrypted to the attacker's key. When its recipient opened a signed...

CVE-2026-107587 Improper Certificate Validation in hMailServer

Improper certificate validation in the webmail of Progressive Robot hMailServer 6.3.2 through 6.3.5 allows a remote unauthenticated attacker to have S/MIME-encrypted mail that the account later sends to another correspondent also encrypted to the attacker's key. When its recipient opened a signed...

CVE-2026-107582

Progressive Robot hMailServer versions 6.3.3 through 6.3.5 (REST API) and 6.2.22 through 6.3.5 (IMAP PREVIEW) are vulnerable to an inefficient algorithmic complexity flaw. The issue resides in the server's shared string class , where the replace and remove operations run in quadratic time . A rem...

CVE-2026-107582 Inefficient Algorithmic Complexity in hMailServer

Inefficient algorithmic complexity in the REST API 6.3.3 through 6.3.5 and the IMAP PREVIEW response 6.2.22 through 6.3.5 of Progressive Robot hMailServer allows a remote unauthenticated attacker to make the webmail, the administration console and the REST API unavailable by sending a message. To...

EUVD-2026-94864

Inefficient algorithmic complexity in the REST API 6.3.3 through 6.3.5 and the IMAP PREVIEW response 6.2.22 through 6.3.5 of Progressive Robot hMailServer allows a remote unauthenticated attacker to make the webmail, the administration console and the REST API unavailable by sending a message. To...

CVE-2026-107582 Inefficient Algorithmic Complexity in hMailServer

Inefficient algorithmic complexity in the REST API 6.3.3 through 6.3.5 and the IMAP PREVIEW response 6.2.22 through 6.3.5 of Progressive Robot hMailServer allows a remote unauthenticated attacker to make the webmail, the administration console and the REST API unavailable by sending a message. To...

CVE-2026-107581

Progressive Robot hMailServer versions 6.0.0 through 6.3.5 are vulnerable to Inefficient Algorithmic Complexity (CWE-407) and Excessive Memory Consumption (CWE-400) via IMAP commands. The vulnerability stems from several issues: the FETCH data-item parser uses a case-insensitive string replacemen...

CVE-2026-107581 Inefficient Algorithmic Complexity in hMailServer

Progressive Robot hMailServer 6.0.0 through 6.3.5 processes several IMAP commands from a signed-in account in time quadratic in the command's length or in the number of elements it names, and can be made to hold memory out of proportion to a command. The FETCH data-item parser normalised a BODY...

EUVD-2026-94863

Progressive Robot hMailServer 6.0.0 through 6.3.5 processes several IMAP commands from a signed-in account in time quadratic in the command's length or in the number of elements it names, and can be made to hold memory out of proportion to a command. The FETCH data-item parser normalised a BODY...

CVE-2026-107581 Inefficient Algorithmic Complexity in hMailServer

Progressive Robot hMailServer 6.0.0 through 6.3.5 processes several IMAP commands from a signed-in account in time quadratic in the command's length or in the number of elements it names, and can be made to hold memory out of proportion to a command. The FETCH data-item parser normalised a BODY...

CVE-2026-107580

Progressive Robot hMailServer versions 6.0.0 through 6.3.5 are vulnerable to a Denial of Service (DoS) attack due to inefficient algorithmic complexity during the decoding of message header fields. A remote unauthenticated attacker can send a message containing an RFC 2047 encoded word with a hig...

CVE-2026-107580 Inefficient Algorithmic Complexity in hMailServer

Inefficient algorithmic complexity in the decoding of message header fields in Progressive Robot hMailServer 6.0.0 through 6.3.5 allows a remote unauthenticated attacker to make the IMAP, SMTP and POP3 services, or the webmail, unavailable by sending a message. The server unfolded a decoded heade...

EUVD-2026-94862

Inefficient algorithmic complexity in the decoding of message header fields in Progressive Robot hMailServer 6.0.0 through 6.3.5 allows a remote unauthenticated attacker to make the IMAP, SMTP and POP3 services, or the webmail, unavailable by sending a message. The server unfolded a decoded heade...

CVE-2026-107580 Inefficient Algorithmic Complexity in hMailServer

Inefficient algorithmic complexity in the decoding of message header fields in Progressive Robot hMailServer 6.0.0 through 6.3.5 allows a remote unauthenticated attacker to make the IMAP, SMTP and POP3 services, or the webmail, unavailable by sending a message. The server unfolded a decoded heade...

CVE-2026-107579 Inefficient Algorithmic Complexity in hMailServer

Inefficient algorithmic complexity in the bounce and complaint processing of Progressive Robot hMailServer 6.3.4 and 6.3.5 allows a remote unauthenticated attacker to stop mail delivery by sending messages, when bounce processing or complaint processing is enabled or a mailing list is managed by...

EUVD-2026-94861

Inefficient algorithmic complexity in the bounce and complaint processing of Progressive Robot hMailServer 6.3.4 and 6.3.5 allows a remote unauthenticated attacker to stop mail delivery by sending messages, when bounce processing or complaint processing is enabled or a mailing list is managed by...

CVE-2026-107579 Inefficient Algorithmic Complexity in hMailServer

Inefficient algorithmic complexity in the bounce and complaint processing of Progressive Robot hMailServer 6.3.4 and 6.3.5 allows a remote unauthenticated attacker to stop mail delivery by sending messages, when bounce processing or complaint processing is enabled or a mailing list is managed by...

CVE-2026-107579

Progressive Robot hMailServer versions 6.3.4 and 6.3.5 are vulnerable to a high-severity denial-of-service (DoS) condition due to inefficient algorithmic complexity in bounce and complaint processing. When bounce processing, complaint processing, or mailing list management is enabled, an unauthen...

CVE-2026-107578

Progressive Robot hMailServer versions 6.3.4 and 6.3.5 are vulnerable to local privilege escalation due to improper link resolution and external control of file paths in the hMailServer.exe administrative command-line operations. On Windows , a local attacker controlling the low-privilege service...

CVE-2026-107578 Improper Link Resolution Before File Access ('Link Following') in hMailServer

Improper link resolution and external control of file paths in the administrative command-line operations of hMailServer.exe in Progressive Robot hMailServer 6.3.4 and 6.3.5 allow a local attacker who already runs code as the low-privilege service account to escalate privilege. On Windows,...