CVE-2026-107585

Progressive Robot hMailServer versions 6.3.4 and 6.3.5 are vulnerable to an uncontrolled eviction issue in the REST API pending sign-in tables. Because the routes for single sign-on (OpenID Connect, SAML) and passkey challenges are accessible without authentication, an unauthenticated remote atta...

CVE-2026-107585 Allocation of Resources Without Limits or Throttling in hMailServer

Uncontrolled eviction in the pending sign-in tables of the REST API in Progressive Robot hMailServer 6.3.4 and 6.3.5 allows a remote unauthenticated attacker to make other users' OpenID Connect, SAML and passkey sign-ins fail. The routes that start a single sign-on and hand out a passkey sign-in...

EUVD-2026-95037

Uncontrolled eviction in the pending sign-in tables of the REST API in Progressive Robot hMailServer 6.3.4 and 6.3.5 allows a remote unauthenticated attacker to make other users' OpenID Connect, SAML and passkey sign-ins fail. The routes that start a single sign-on and hand out a passkey sign-in...

CVE-2026-107583

Inefficient algorithmic complexity in the webmail's message view of the REST API in Progressive Robot hMailServer 6.3.2 through 6.3.5 allows a remote unauthenticated attacker to make the webmail, the administration console and the REST API unavailable by sending a message. The route that renders ...

CVE-2026-107582

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-2026-107577

Inefficient algorithmic complexity and a non-terminating loop in the MIME processing of received messages in Progressive Robot hMailServer 6.0.0 through 6.3.5 allow a remote unauthenticated attacker to make the mail services unavailable by sending a message. Removing a MIME header parameter whose...

EUVD-2026-94866

Inefficient algorithmic complexity in the webmail's message view of the REST API in Progressive Robot hMailServer 6.3.2 through 6.3.5 allows a remote unauthenticated attacker to make the webmail, the administration console and the REST API unavailable by sending a message. The route that renders ...

CVE-2026-107583 Inefficient Algorithmic Complexity in hMailServer

Inefficient algorithmic complexity in the webmail's message view of the REST API in Progressive Robot hMailServer 6.3.2 through 6.3.5 allows a remote unauthenticated attacker to make the webmail, the administration console and the REST API unavailable by sending a message. The route that renders ...

CVE-2026-107583

Progressive Robot hMailServer versions 6.3.2 through 6.3.5 are vulnerable to an inefficient algorithmic complexity flaw in the webmail's message view of the REST API . A remote unauthenticated attacker can send a message containing an HTML reference to a single small embedded image a very large n...

CVE-2026-107583 Inefficient Algorithmic Complexity in hMailServer

Inefficient algorithmic complexity in the webmail's message view of the REST API in Progressive Robot hMailServer 6.3.2 through 6.3.5 allows a remote unauthenticated attacker to make the webmail, the administration console and the REST API unavailable by sending a message. The route that renders ...

CVE-2026-107583 Inefficient Algorithmic Complexity in hMailServer

Inefficient algorithmic complexity in the webmail's message view of the REST API in Progressive Robot hMailServer 6.3.2 through 6.3.5 allows a remote unauthenticated attacker to make the webmail, the administration console and the REST API unavailable by sending a message. The route that renders ...

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-2026-107582 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-2026-107582

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...

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...

EUVD-2026-94858

Inefficient algorithmic complexity and a non-terminating loop in the MIME processing of received messages in Progressive Robot hMailServer 6.0.0 through 6.3.5 allow a remote unauthenticated attacker to make the mail services unavailable by sending a message. Removing a MIME header parameter whose...

CVE-2026-107577 Loop with Unreachable Exit Condition ('Infinite Loop') in hMailServer

Inefficient algorithmic complexity and a non-terminating loop in the MIME processing of received messages in Progressive Robot hMailServer 6.0.0 through 6.3.5 allow a remote unauthenticated attacker to make the mail services unavailable by sending a message. Removing a MIME header parameter whose...

CVE-2026-107577 Loop with Unreachable Exit Condition ('Infinite Loop') in hMailServer

Inefficient algorithmic complexity and a non-terminating loop in the MIME processing of received messages in Progressive Robot hMailServer 6.0.0 through 6.3.5 allow a remote unauthenticated attacker to make the mail services unavailable by sending a message. Removing a MIME header parameter whose...

CVE-2026-107577

Progressive Robot hMailServer versions 6.0.0 through 6.3.5 are vulnerable to a non-terminating loop and inefficient algorithmic complexity during MIME processing of received messages. A remote unauthenticated attacker can trigger a perpetual loop by sending a message where a MIME header parameter...

CVE-2026-104659

Missing Host header validation and missing throttling of failed administrator sign-ins in the REST API listener of Progressive Robot hMailServer 6.0.0 through 6.3.5 allow a remote attacker to brute-force the server administrator's password through the administrator's own browser by DNS rebinding...