CVE-2026-27858
Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory. Attacker can force managesieve-login to be unavailable by repeatedly crashing the process. Protect access to managesieve protocol, or install fixed version. No publicly available exploits are known.
- Affected products
- Dovecot, Linuxmint, Red Os, Rocky Linux, Ubuntu
- Dovecot
- < 2.4.3
- Open-xchange Dovecot
- < 2.3.22.1, 3.0.5, 3.1.4
- Fix
- Available
- CVSS 3.1
- 7.5 HIGH
- EPSS
- 0.8% (54th percentile)
- Weakness
- CWE-770, CWE-400
- NVD status
- Modified
- Published
- 2026-03-27
CVE-2026-27858 at NVD
No indexed exploits for CVE-2026-27858 yet
Our index is partial: it proves presence, never absence
No exploit for CVE-2026-27858 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.