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01 Record

CVE-2026-107585

Allocation of Resources Without Limits or Throttling in hMailServer

MediumPUBLISHEDCNA: GitLab
CNA base score5.3 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

02 Description

Allocation of Resources Without Limits or Throttling in hMailServer

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.44% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 38.6% of scored records. A rank, not a probability.
NVD base score
5.3 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD analysis status
Deferred. NVD last modified this record on 2026-10-08.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-10-08 15:11Z20 DAYS AGO
Last updated
2026-10-08 19:13Z20 DAYS AGO
Reserved
2026-10-08
Assigning CNA
GitLab
Record state
PUBLISHED
Severity
Medium (CVSS 5.3)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weaknesses
  • CWE-770Allocation of Resources Without Limits or ThrottlingBase
Data version
5.2
Document digest
c6f5821f0541c036df4f0828f50304b4a61bfa33dca210263a62394c4df82b50

05 Affected products

VendorProductVersionsPlatforms
Progressive Robot LtdhMailServer6.3.4 to < 6.3.6—

06 References

07 Remediation

Upgrade to hMailServer 6.3.6, in which a pending OpenID Connect, SAML or passkey sign-in is no longer held on the server at all but carried by the browser in a cookie sealed with AES-256-GCM under a key held only in memory and good once, so there is no table a flood of unauthenticated starts can fill. Until then: limit the rate of /portal/oidc/start, /portal/saml/start and /api/v1/passkeys/challenge per client at a reverse proxy, and keep password sign-in available for administrators.