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 heap buffer in the hMailServer service process, which runs as LocalSystem by default. The user does this by passing a long hexadecimal string to the COM method Utilities.BlowfishDecrypt, which checked no authentication. The routine converted hexadecimal input of any length into a fixed 255-byte buffer before decrypting it in place. The result is a denial of service (service crash), and possibly code execution with the privileges of the service account.
Metrics
Affected Vendors & Products
References
History
Fri, 09 Oct 2026 07:30:00 +0000
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Progressive Robot
Progressive Robot hmailserver |
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| Vendors & Products |
Progressive Robot
Progressive Robot hmailserver |
Thu, 08 Oct 2026 15:15:00 +0000
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ssvc
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Thu, 08 Oct 2026 11:00:00 +0000
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| Description | 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 heap buffer in the hMailServer service process, which runs as LocalSystem by default. The user does this by passing a long hexadecimal string to the COM method Utilities.BlowfishDecrypt, which checked no authentication. The routine converted hexadecimal input of any length into a fixed 255-byte buffer before decrypting it in place. The result is a denial of service (service crash), and possibly code execution with the privileges of the service account. | |
| Title | Heap-based Buffer Overflow in hMailServer | |
| Weaknesses | CWE-122 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitLab
Published: 2026-10-08T10:53:10.627Z
Updated: 2026-10-08T14:22:28.966Z
Reserved: 2026-09-29T21:04:45.349Z
Link: CVE-2026-103010
Updated: 2026-10-08T14:22:24.964Z
Status : Deferred
Published: 2026-10-08T11:16:42.117
Modified: 2026-10-08T21:02:43.860
Link: CVE-2026-103010
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