CVE-2026-40016
đļ mediumSummary
Attacker can upload a malicious Sieve script over ManageSieve service (or locally) to bypass configured CPU time limits for Sieve up to 130 times of the configured limit. Attacker can use this to degrade server performance and bypass configured CPU time limits for Sieve scripts. Install fixed version, or alternatively prevent direct access to Sieve scripts via ManageSieve or local access. No publicly available exploits are known.
CVSS Score
5.3
Medium
EPSS Score
0.0
Exploit Probability
Published Date
2026-05-12
First Seen: 2026-05-19
đ Relative Risk Intelligence
This CVE is Lower Risk - more severe than 19.8% of all 321,566 vulnerabilities in our database.
#257,788
Below average severity
Severity Percentile
đ¯ CISA SSVC Assessment Updated: May 12, 2026
đ Exploitation Status
None
No known exploits
âī¸ Automatable
NO
Requires human interaction
đĨ Technical Impact
Partial
Limited system impact
SSVC data provided by
CISA
Last Modified
2026-05-18
Source
NVD đ
CVSS Vector 3.1
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE IDs (Weakness Types)