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-2026-107575 Inefficient Algorithmic Complexity in hMailServer

Inefficient algorithmic complexity in the SPF macro expansion of Progressive Robot hMailServer 6.3.4 and 6.3.5 allows a remote unauthenticated attacker to consume worker-thread time by publishing a crafted SPF record. RFC 7208 section 7.1 requires a name too long to look up to lose whole labels...

EUVD-2026-94857

Inefficient algorithmic complexity in the SPF macro expansion of Progressive Robot hMailServer 6.3.4 and 6.3.5 allows a remote unauthenticated attacker to consume worker-thread time by publishing a crafted SPF record. RFC 7208 section 7.1 requires a name too long to look up to lose whole labels...

CVE-2026-107575

Progressive Robot hMailServer versions 6.3.4 and 6.3.5 are vulnerable to an inefficient algorithmic complexity flaw in the SPF macro expansion. A remote unauthenticated attacker can consume worker-thread time by publishing a crafted SPF record where the domain-spec expands via macros to a name ex...

CVE-2026-107575 Inefficient Algorithmic Complexity in hMailServer

Inefficient algorithmic complexity in the SPF macro expansion of Progressive Robot hMailServer 6.3.4 and 6.3.5 allows a remote unauthenticated attacker to consume worker-thread time by publishing a crafted SPF record. RFC 7208 section 7.1 requires a name too long to look up to lose whole labels...

CVE-2026-107572

Progressive Robot hMailServer versions 6.2.24 through 6.3.5 are vulnerable to a Denial of Service (DoS) condition due to inefficient complexity in Sieve filter evaluation. The vulnerability arises from a backtracking descent during :matches pattern matching, where execution time grows exponential...

EUVD-2026-94856

Inefficient complexity in the Sieve filter evaluation of Progressive Robot hMailServer 6.2.24 through 6.3.5 allows an authenticated account holder to make the mail services unavailable with their own filter. A ':matches' pattern was matched by a backtracking descent whose time grew with the match...

CVE-2026-107572 Inefficient Regular Expression Complexity in hMailServer

Inefficient complexity in the Sieve filter evaluation of Progressive Robot hMailServer 6.2.24 through 6.3.5 allows an authenticated account holder to make the mail services unavailable with their own filter. A ':matches' pattern was matched by a backtracking descent whose time grew with the match...

CVE-2026-107572 Inefficient Regular Expression Complexity in hMailServer

Inefficient complexity in the Sieve filter evaluation of Progressive Robot hMailServer 6.2.24 through 6.3.5 allows an authenticated account holder to make the mail services unavailable with their own filter. A ':matches' pattern was matched by a backtracking descent whose time grew with the match...

EUVD-2026-94855

Incorrect default permissions in the Windows installer of Progressive Robot hMailServer 6.0.0 through 6.3.5 allow a local authenticated user to read the mail server's data. The installer created the data, log, temp, database and event folders and the hMailServer.INI configuration file with the...

CVE-2026-107573

Progressive Robot hMailServer versions 6.0.0 through 6.3.5 on Windows suffer from incorrect default permissions in the installer. The installer creates data, log, temp, database, and event folders, along with the hMailServer.INI configuration file, using permissions inherited from the installatio...

CVE-2026-107573 Incorrect Default Permissions in hMailServer

Incorrect default permissions in the Windows installer of Progressive Robot hMailServer 6.0.0 through 6.3.5 allow a local authenticated user to read the mail server's data. The installer created the data, log, temp, database and event folders and the hMailServer.INI configuration file with the...

CVE-2026-107573 Incorrect Default Permissions in hMailServer

Incorrect default permissions in the Windows installer of Progressive Robot hMailServer 6.0.0 through 6.3.5 allow a local authenticated user to read the mail server's data. The installer created the data, log, temp, database and event folders and the hMailServer.INI configuration file with the...

CVE-2026-107574

Progressive Robot hMailServer is vulnerable to a Denial of Service (DoS) attack due to inefficient algorithmic complexity (O(N^2)) in its JSON reader. The component fails to efficiently handle duplicated member names, causing significant processing delays: a 4 MB object can take 300 seconds to pr...

CVE-2026-107574 Inefficient Algorithmic Complexity in hMailServer

Inefficient algorithmic complexity in the JSON reader of Progressive Robot hMailServer allows a remote unauthenticated attacker to make the mail services unavailable. Reading a JSON object kept the first of each duplicated member name by searching the members already read, so an object of N...

EUVD-2026-94854

Inefficient algorithmic complexity in the JSON reader of Progressive Robot hMailServer allows a remote unauthenticated attacker to make the mail services unavailable. Reading a JSON object kept the first of each duplicated member name by searching the members already read, so an object of N...

CVE-2026-107574 Inefficient Algorithmic Complexity in hMailServer

Inefficient algorithmic complexity in the JSON reader of Progressive Robot hMailServer allows a remote unauthenticated attacker to make the mail services unavailable. Reading a JSON object kept the first of each duplicated member name by searching the members already read, so an object of N...

CVE-2026-104660

Missing authorization on COM objects in Progressive Robot hMailServer 6.0.0 through 6.3.5 Windows only lets a local interactive user with no hMailServer credential read and write arbitrary files as the service account and queue mail as any sender. The service registers its COM classes with no DCO...

CVE-2026-104704

Progressive Robot hMailServer 6.0.0 through 6.3.5 does not enforce TLS for outbound SMTP delivery to a mail exchanger whose DNSSEC-validated TLSA records contain no DANE-EE usage 3 record, contrary to RFC 7672 section 2.2. The server used only DANE-EE records and treated a validated TLSA record s...

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...