UBUNTU-CVE-2026-24031

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Source
https://ubuntu.com/security/CVE-2026-24031
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-24031.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-24031
Upstream
  • CVE-2026-24031
Downstream
Related
Published
2026-03-27T00:00:00Z
Modified
2026-04-22T16:26:07.164632Z
Severity
  • 7.7 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Dovecot SQL based authentication can be bypassed when authusernamechars is cleared by admin. This vulnerability allows bypassing authentication for any user and user enumeration. Do not clear authusernamechars. If this is not possible, install latest fixed version. No publicly available exploits are known.

References

Affected packages

Ubuntu:25.10 / dovecot

Package

Name
dovecot
Purl
pkg:deb/ubuntu/dovecot@1:2.4.1+dfsg1-5ubuntu4.1?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1:2.4.1+dfsg1-5ubuntu4.1

Affected versions

1:2.*
1:2.3.21.1+dfsg1-1ubuntu2
1:2.4.1+dfsg1-5ubuntu1
1:2.4.1+dfsg1-5ubuntu3
1:2.4.1+dfsg1-5ubuntu4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "dovecot-auth-lua",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
        },
        {
            "binary_name": "dovecot-core",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
        },
        {
            "binary_name": "dovecot-flatcurve",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
        },
        {
            "binary_name": "dovecot-gssapi",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
        },
        {
            "binary_name": "dovecot-imapd",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
        },
        {
            "binary_name": "dovecot-ldap",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
        },
        {
            "binary_name": "dovecot-lmtpd",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
        },
        {
            "binary_name": "dovecot-managesieved",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
        },
        {
            "binary_name": "dovecot-mysql",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
        },
        {
            "binary_name": "dovecot-pgsql",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
        },
        {
            "binary_name": "dovecot-pop3d",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
        },
        {
            "binary_name": "dovecot-sieve",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
        },
        {
            "binary_name": "dovecot-solr",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
        },
        {
            "binary_name": "dovecot-sqlite",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
        },
        {
            "binary_name": "dovecot-submissiond",
            "binary_version": "1:2.4.1+dfsg1-5ubuntu4.1"
        }
    ],
    "availability": "No subscription required"
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-24031.json"