CVE-2026-114472
Insufficient Resource Pool in hMailServer
02 Description
Insufficient Resource Pool in hMailServer
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 0.20% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 10.9% of scored records. A rank, not a probability.
- NVD base score
- 3.7 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
- NVD analysis status
- Awaiting Analysis. NVD last modified this record on 2026-10-22.
- 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
- 2026-10-21 15:11Z7 DAYS AGO
- Last updated
- 2026-10-21 15:11Z7 DAYS AGO
- Reserved
- 2026-10-21
- Assigning CNA
- GitLab
- Record state
- PUBLISHED
- Severity
- Low (CVSS 3.7)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
- Weaknesses
- CWE-410Insufficient Resource PoolClass
- Data version
- 5.2
- Document digest
- 0af2ed451a93395e9d4c04baa6632a2c290390198717fd723377f7b08a7dcc1d
05 Affected products
06 References
07 Remediation
Upgrade to hMailServer 6.3.7, whose ACME challenge responder serves each accepted connection on its own short-lived handler, up to 64 at once, instead of one at a time, so that one idle connection no longer holds up the others; it closes a connection past those 64, so that a client that keeps 64 idle connections open throughout a validation still has the certificate authority's connection closed. Until then, and with 6.3.7 where that remaining case matters, where ACME is in use, restrict who may reach the challenge port during a renewal if the surrounding network allows it, or obtain certificates with an external ACME client (for example a DNS-01 client) so that this responder does not run, and monitor certificate expiry so that a starved renewal is noticed before the certificate lapses.