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

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-2026-107574

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...

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-2026-107574 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-2026-104659

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...

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-2026-104658

The Linux live-update apply helper hmailserver-update of Progressive Robot hMailServer 6.3.4 and 6.3.5 runs as root on a request file written by the unprivileged hmailserver service account, and took from that request the program used to verify an AppImage update's signature and the systemd unit ...

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...

CVE-2026-103647

Cross-site scripting in the webmail of Progressive Robot hMailServer 6.3.2 through 6.3.5 allows a remote attacker who can send a user an encrypted message to run script in the webmail's origin with that user's session. When the webmail decrypted an S/MIME message from 6.3.2 or an OpenPGP message...

CVE-2026-103010

Heap-based buffer overflow in the legacy Blowfish decryption routine BlowFishEncryptor::DecryptFromString in Progressive Robot hMailServer 6.0.0 through 6.3.3 on Windows allows a local interactive user with no hMailServer credentials to write bytes of their choosing past the end of a 255-byte hea...

CVE-2026-103011

Heap-based buffer overflow in the legacy Blowfish encryption routine BlowFishEncryptor::Encode, called by EncryptToString in Progressive Robot hMailServer 6.0.0 through 6.3.5 allows an authenticated mailbox user to cause a denial of service service crash, and possibly other unspecified impact. In...

CVE-2026-103011 Heap-based Buffer Overflow in hMailServer

Heap-based buffer overflow in the legacy Blowfish encryption routine BlowFishEncryptor::Encode, called by EncryptToString in Progressive Robot hMailServer 6.0.0 through 6.3.5 allows an authenticated mailbox user to cause a denial of service service crash, and possibly other unspecified impact. In...

CVE-2026-103011 Heap-based Buffer Overflow in hMailServer

Heap-based buffer overflow in the legacy Blowfish encryption routine BlowFishEncryptor::Encode, called by EncryptToString in Progressive Robot hMailServer 6.0.0 through 6.3.5 allows an authenticated mailbox user to cause a denial of service service crash, and possibly other unspecified impact. In...

EUVD-2026-94838

Heap-based buffer overflow in the legacy Blowfish encryption routine BlowFishEncryptor::Encode, called by EncryptToString in Progressive Robot hMailServer 6.0.0 through 6.3.5 allows an authenticated mailbox user to cause a denial of service service crash, and possibly other unspecified impact. In...

CVE-2026-103011

Progressive Robot hMailServer versions 6.0.0 through 6.3.5 are vulnerable to a heap-based buffer overflow in the legacy Blowfish encryption routine (BlowFishEncryptor::Encode , called by EncryptToString ). The flaw occurs because the padding loop can write up to 7 zero bytes between 2 and 232 byt...

CVE-2026-103010 Heap-based Buffer Overflow in hMailServer

Heap-based buffer overflow in the legacy Blowfish decryption routine BlowFishEncryptor::DecryptFromString in Progressive Robot hMailServer 6.0.0 through 6.3.3 on Windows allows a local interactive user with no hMailServer credentials to write bytes of their choosing past the end of a 255-byte hea...

CVE-2026-103010

Progressive Robot hMailServer versions 6.0.0 through 6.3.3 on Windows are vulnerable to a heap-based buffer overflow in the legacy Blowfish decryption routine (BlowFishEncryptor::DecryptFromString ). A local interactive user without credentials can exploit this by passing a long hexadecimal strin...