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 a received message's HTML replaced each reference to an embedded image in place, with work that grew with the square of the number of references, and wrote the image out for every reference while counting it against its size limit only once. A message whose HTML refers to one small embedded image a very large number of times, opened in the webmail by its recipient, therefore keeps one of the listener's four worker threads busy for minutes and makes it build a document of gigabytes, so that a few such messages leave the HTTP listener unable to answer anybody.
Metrics
Affected Vendors & Products
References
History
Thu, 08 Oct 2026 15:15:00 +0000
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ssvc
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Thu, 08 Oct 2026 13:30:00 +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 12:00:00 +0000
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| Description | 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 a received message's HTML replaced each reference to an embedded image in place, with work that grew with the square of the number of references, and wrote the image out for every reference while counting it against its size limit only once. A message whose HTML refers to one small embedded image a very large number of times, opened in the webmail by its recipient, therefore keeps one of the listener's four worker threads busy for minutes and makes it build a document of gigabytes, so that a few such messages leave the HTTP listener unable to answer anybody. | |
| Title | Inefficient Algorithmic Complexity in hMailServer | |
| Weaknesses | CWE-407 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitLab
Published: 2026-10-08T11:49:06.081Z
Updated: 2026-10-08T14:14:10.184Z
Reserved: 2026-10-08T10:52:20.637Z
Link: CVE-2026-107583
Updated: 2026-10-08T14:14:05.892Z
Status : Deferred
Published: 2026-10-08T12:17:16.633
Modified: 2026-10-08T21:02:43.860
Link: CVE-2026-107583
No data.