CVE-2026-27858
7.5
HIGH
CVSS 3.1
EPSS 0.05%
Description
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.
How to fix CVE-2026-27858
To remediate CVE-2026-27858, upgrade the affected package to a fixed version below.
- —upgrade to 1:2.3.13+dfsg1-2+deb11u3 or later
Is CVE-2026-27858 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 1:2.3.13+dfsg1-2+deb11u3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |