🛡️ USN-8365-1 — dovecot

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

dovecot vulnerabilities

It was discovered that Dovecot incorrectly treated some variable expansion

pipelines as safe in authentication filters. An attacker could possibly use

this issue to perform SQL or LDAP injection attacks. This issue only

affected Ubuntu 25.10 and Ubuntu 26.04 LTS. (CVE-2026-27851)

It was discovered that Dovecot incorrectly verified SCRAM TLS channel

binding in certain base64 exchanges. A remote attacker could possibly use

this issue to obtain sensitive information in a machine-in-the-middle

attack. (CVE-2026-33603)

It was discovered that Dovecot incorrectly enforced Sieve script CPU

limits. An attacker could possibly use this issue to cause Dovecot to use

excessive resources, leading to a denial of service. (CVE-2026-40016)

It was discovered that Dovecot incorrectly handled certain IMAP SETACL

commands. An attacker could possibly use this issue to spam folders to

other users. (CVE-2026-40020)

It was discovered that Dovecot incorrectly handled excessive IMAP bracing.

An attacker could possibly use this issue to cause Dovecot to use excessive

resources, leading to a denial of service. (CVE-2026-42006)

Affected software

USN-8365-1 is recorded against 1 package.

  • dovecot (fixed in 1:2.4.2+dfsg1-3ubuntu2.1)

Timeline and source

Published on 2 June 2026 and last revised on 30 June 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

ubuntu.com (Advisory)
ubuntu.com (Report)
ubuntu.com (Report)
ubuntu.com (Report)
ubuntu.com (Report)
ubuntu.com (Report)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-06-02
Updated 2026-08-12
Modified 2026-06-30
Fix URL N/A

Affected Packages

Software From version Fixed in
dovecot — 1:2.4.2+dfsg1-3ubuntu2.1

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