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CVE

CVE-2026-27858

dovecot: denial of service via crafted message before authentication (important)
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CVE

CVE-2026-27858

dovecot: denial of service via crafted message before authentication (important)

DOCUMENTATION: A flaw was found in dovecot. An unauthenticated and remote attacker can send a crafted message that causes managesieve to allocate an excessive amount of memory, forcing managesieve-login to be unavailable by repeatedly crashing the process, resulting in a denial of service. 

            STATEMENT: This flaw allows an unauthenticated and remote attacker to cause a denial of service via a specially crafted message. Due to this reason, this vulnerability has been rated with an important severity.

            MITIGATION: To mitigate this vulnerability, protect access to the managesieve protocol by configuring firewall rules to restrict access to the managesieve port and only allow connections from trusted IP addresses or networks.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.5
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
C
H
U
-
C
H
U
-

Related Resources

No items found.

References

https://access.redhat.com/security/cve/CVE-2026-27858

Severity

0

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
0
EPSS Probability
0.00048%
EPSS Percentile
0.15167%
Introduced Version
0,3.0.0,3.1.0
Fix Available
1:2.3.16-7.el8_10,1:2.3.16-18.el9_8,1:2.3.16-15.el9_7.1,1:2.3.19.1+dfsg1-2.1+deb12u2,1:2.3.13+dfsg1-2+deb11u3,1:2.4.1+dfsg1-6+deb13u4,1:2.3.21+dfsg1-2ubuntu6.3,1:2.3.16+dfsg1-3ubuntu2.7,2.4.3,2.3.22.1,3.0.5,3.1.4,1:2.3.20-1.amzn2023.0.3

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