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CVE

CVE-2026-27857

dovecot: denial of service via specially crafted NOOP command (important)
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CVE

CVE-2026-27857

dovecot: denial of service via specially crafted NOOP command (important)

DOCUMENTATION: A flaw was found in dovecot. An unauthenticated and remote attacker can send a specially crafted "NOOP" command containing numerous open and close parentheses without a command-ending line feed, causing the server to allocate an excessive amount of memory, 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 "NOOP" command. Due to this reason, this vulnerability has been rated with an important severity.

            MITIGATION: Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.

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
4.3
-
3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
C
H
U
-
C
H
U
-

Related Resources

No items found.

References

https://access.redhat.com/security/cve/CVE-2026-27857

Severity

0

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
0
EPSS Probability
0.00034%
EPSS Percentile
0.10442%
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+dfsg1-3ubuntu2.7,2.4.3,2.3.22.1,3.0.5,3.1.4,2.4.3-r0,1:2.3.20-1.amzn2023.0.3,1:2.2.36-6.amzn2.1.3

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