CVE-2026-40019
Medium · 5.9CVSS
5.9
EPSS
0.4%
Published
Aug 28, 2026
CISA due date
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The record
An unauthenticated attacker can send a truncated quoted argument to the ManageSieve login process, which makes it spin in an infinite loop consuming CPU. This can cause degradation or denial of service for Sieve script management, and repeated connections can consume all available CPU on the server. Monitor system for abnormal CPU usage and kill the offending process. Restrict network access to the ManageSieve service to trusted clients. Update to non-vulnerable version. No publicly available exploits are known.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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