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01 Record

CVE-2026-107572

Inefficient Regular Expression Complexity in hMailServer

MediumPUBLISHEDCNA: GitLab
CNA base score6.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

02 Description

Inefficient Regular Expression Complexity 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.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • 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
0.30% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 23.2% of scored records. A rank, not a probability.
NVD base score
6.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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 11:46Z20 DAYS AGO
Last updated
2026-10-08 17:35Z20 DAYS AGO
Reserved
2026-10-08
Assigning CNA
GitLab
Record state
PUBLISHED
Severity
Medium (CVSS 6.5)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weaknesses
  • CWE-1333Inefficient Regular Expression ComplexityBase
Data version
5.2
Document digest
105d0fda6cc805de0ee9d13c84d1e87838ae2fad207cb81e5c10bb79e171c930

05 Affected products

VendorProductVersionsPlatforms
Progressive Robot LtdhMailServer6.2.24 to < 6.3.6—

06 References

07 Remediation

Upgrade to hMailServer 6.3.6, which matches a ':matches' pattern by placing each piece once (time linear in the value times the pattern) and removes 'deleteheader' fields in one pass. Until then, review active Sieve scripts for ':matches' patterns with several wildcards and for 'deleteheader', and lower the maximum message size.