CVE-2026-107575

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Source

https://cve.org/CVERecord?id=CVE-2026-107575

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-107575.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-107575

Published

2026-10-08T11:46:46Z

Modified

2026-10-28T02:30:33Z

Severity

5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator

Summary

Inefficient Algorithmic Complexity in hMailServer

Details

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 from the left; the server did this by removing one label at a time and copying the rest of the name each time, so the work grew with the square of the expansion. An attacker who publishes an SPF record for a domain they control, with a mechanism whose domain-spec expands through macros to a name far longer than 253 characters, makes the SPF check of a message from that domain take several seconds. The expansion is bounded by SPF's own per-term and per-macro limits, so the loss of availability is partial.

Database specific

{
    "cna_assigner":  "GitLab",
    "cwe_ids":  [
        "CWE-407"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107575.json"
}

References

Affected packages

Git / gitlab.com/hmailserver/hmailserver

Affected ranges

Type

GIT

Repo

https://gitlab.com/hmailserver/hmailserver

Events

Introduced

51e2dbda08d6aa7fcda5a48f1af05221809f78be

Fixed

e3c448aa66fc310b74d076884d54fae951296915

Database specific

Show details

{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "6.3.4"
                },
                {
                    "fixed":  "6.3.6"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        }
    ]
}

Affected versions

v6.*

v6.3.4

v6.3.5

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-107575.json"