UBUNTU-CVE-2026-42393 (CVE-2026-42393)
Vulnerability from osv_ubuntu – Published: 2026-08-28 00:00 – Updated: 2026-09-02 16:15 – Source website
VLAI
Details
The comparison used for the doveadm password and API key is not fully timing safe and can reveal the length of the configured secret. An attacker with access to the same network as the doveadm service, able to make repeated requests and measure response timing accurately, can learn the length of the secret, which reduces the effort needed to guess it. The secret value itself is not disclosed. Restrict network access to the doveadm service to trusted clients. Update to non-vulnerable version. No publicly available exploits are known.
Severity
N/A (UNKNOWN)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "dovecot-core",
"binary_version": "1:2.2.9-1ubuntu2.6+esm4"
},
{
"binary_name": "dovecot-gssapi",
"binary_version": "1:2.2.9-1ubuntu2.6+esm4"
},
{
"binary_name": "dovecot-imapd",
"binary_version": "1:2.2.9-1ubuntu2.6+esm4"
},
{
"binary_name": "dovecot-ldap",
"binary_version": "1:2.2.9-1ubuntu2.6+esm4"
},
{
"binary_name": "dovecot-lmtpd",
"binary_version": "1:2.2.9-1ubuntu2.6+esm4"
},
{
"binary_name": "dovecot-managesieved",
"binary_version": "1:2.2.9-1ubuntu2.6+esm4"
},
{
"binary_name": "dovecot-mysql",
"binary_version": "1:2.2.9-1ubuntu2.6+esm4"
},
{
"binary_name": "dovecot-pgsql",
"binary_version": "1:2.2.9-1ubuntu2.6+esm4"
},
{
"binary_name": "dovecot-pop3d",
"binary_version": "1:2.2.9-1ubuntu2.6+esm4"
},
{
"binary_name": "dovecot-sieve",
"binary_version": "1:2.2.9-1ubuntu2.6+esm4"
},
{
"binary_name": "dovecot-solr",
"binary_version": "1:2.2.9-1ubuntu2.6+esm4"
},
{
"binary_name": "dovecot-sqlite",
"binary_version": "1:2.2.9-1ubuntu2.6+esm4"
},
{
"binary_name": "mail-stack-delivery",
"binary_version": "1:2.2.9-1ubuntu2.6+esm4"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "dovecot",
"purl": "pkg:deb/ubuntu/dovecot@1:2.2.9-1ubuntu2.6+esm4?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:2.1.7-7ubuntu3",
"1:2.2.9-1ubuntu1",
"1:2.2.9-1ubuntu2",
"1:2.2.9-1ubuntu2.1",
"1:2.2.9-1ubuntu2.3",
"1:2.2.9-1ubuntu2.4",
"1:2.2.9-1ubuntu2.5",
"1:2.2.9-1ubuntu2.6",
"1:2.2.9-1ubuntu2.6+esm1",
"1:2.2.9-1ubuntu2.6+esm2",
"1:2.2.9-1ubuntu2.6+esm3",
"1:2.2.9-1ubuntu2.6+esm4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "dovecot-core",
"binary_version": "1:2.2.22-1ubuntu2.14"
},
{
"binary_name": "dovecot-gssapi",
"binary_version": "1:2.2.22-1ubuntu2.14"
},
{
"binary_name": "dovecot-imapd",
"binary_version": "1:2.2.22-1ubuntu2.14"
},
{
"binary_name": "dovecot-ldap",
"binary_version": "1:2.2.22-1ubuntu2.14"
},
{
"binary_name": "dovecot-lmtpd",
"binary_version": "1:2.2.22-1ubuntu2.14"
},
{
"binary_name": "dovecot-lucene",
"binary_version": "1:2.2.22-1ubuntu2.14"
},
{
"binary_name": "dovecot-managesieved",
"binary_version": "1:2.2.22-1ubuntu2.14"
},
{
"binary_name": "dovecot-mysql",
"binary_version": "1:2.2.22-1ubuntu2.14"
},
{
"binary_name": "dovecot-pgsql",
"binary_version": "1:2.2.22-1ubuntu2.14"
},
{
"binary_name": "dovecot-pop3d",
"binary_version": "1:2.2.22-1ubuntu2.14"
},
{
"binary_name": "dovecot-sieve",
"binary_version": "1:2.2.22-1ubuntu2.14"
},
{
"binary_name": "dovecot-solr",
"binary_version": "1:2.2.22-1ubuntu2.14"
},
{
"binary_name": "dovecot-sqlite",
"binary_version": "1:2.2.22-1ubuntu2.14"
},
{
"binary_name": "mail-stack-delivery",
"binary_version": "1:2.2.22-1ubuntu2.14"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "dovecot",
"purl": "pkg:deb/ubuntu/dovecot@1:2.2.22-1ubuntu2.14?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:2.2.18-2ubuntu2",
"1:2.2.22-1ubuntu1",
"1:2.2.22-1ubuntu2",
"1:2.2.22-1ubuntu2.1",
"1:2.2.22-1ubuntu2.2",
"1:2.2.22-1ubuntu2.3",
"1:2.2.22-1ubuntu2.4",
"1:2.2.22-1ubuntu2.6",
"1:2.2.22-1ubuntu2.7",
"1:2.2.22-1ubuntu2.8",
"1:2.2.22-1ubuntu2.9",
"1:2.2.22-1ubuntu2.10",
"1:2.2.22-1ubuntu2.11",
"1:2.2.22-1ubuntu2.12",
"1:2.2.22-1ubuntu2.13",
"1:2.2.22-1ubuntu2.14"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "dovecot-core",
"binary_version": "1:2.2.33.2-1ubuntu4.8"
},
{
"binary_name": "dovecot-gssapi",
"binary_version": "1:2.2.33.2-1ubuntu4.8"
},
{
"binary_name": "dovecot-imapd",
"binary_version": "1:2.2.33.2-1ubuntu4.8"
},
{
"binary_name": "dovecot-ldap",
"binary_version": "1:2.2.33.2-1ubuntu4.8"
},
{
"binary_name": "dovecot-lmtpd",
"binary_version": "1:2.2.33.2-1ubuntu4.8"
},
{
"binary_name": "dovecot-managesieved",
"binary_version": "1:2.2.33.2-1ubuntu4.8"
},
{
"binary_name": "dovecot-mysql",
"binary_version": "1:2.2.33.2-1ubuntu4.8"
},
{
"binary_name": "dovecot-pgsql",
"binary_version": "1:2.2.33.2-1ubuntu4.8"
},
{
"binary_name": "dovecot-pop3d",
"binary_version": "1:2.2.33.2-1ubuntu4.8"
},
{
"binary_name": "dovecot-sieve",
"binary_version": "1:2.2.33.2-1ubuntu4.8"
},
{
"binary_name": "dovecot-solr",
"binary_version": "1:2.2.33.2-1ubuntu4.8"
},
{
"binary_name": "dovecot-sqlite",
"binary_version": "1:2.2.33.2-1ubuntu4.8"
},
{
"binary_name": "mail-stack-delivery",
"binary_version": "1:2.2.33.2-1ubuntu4.8"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "dovecot",
"purl": "pkg:deb/ubuntu/dovecot@1:2.2.33.2-1ubuntu4.8?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:2.2.27-3ubuntu1",
"1:2.2.33.2-1ubuntu1",
"1:2.2.33.2-1ubuntu2",
"1:2.2.33.2-1ubuntu3",
"1:2.2.33.2-1ubuntu4",
"1:2.2.33.2-1ubuntu4.1",
"1:2.2.33.2-1ubuntu4.2",
"1:2.2.33.2-1ubuntu4.3",
"1:2.2.33.2-1ubuntu4.4",
"1:2.2.33.2-1ubuntu4.5",
"1:2.2.33.2-1ubuntu4.6",
"1:2.2.33.2-1ubuntu4.7",
"1:2.2.33.2-1ubuntu4.8"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "dovecot-auth-lua",
"binary_version": "1:2.3.7.2-1ubuntu3.7"
},
{
"binary_name": "dovecot-core",
"binary_version": "1:2.3.7.2-1ubuntu3.7"
},
{
"binary_name": "dovecot-gssapi",
"binary_version": "1:2.3.7.2-1ubuntu3.7"
},
{
"binary_name": "dovecot-imapd",
"binary_version": "1:2.3.7.2-1ubuntu3.7"
},
{
"binary_name": "dovecot-ldap",
"binary_version": "1:2.3.7.2-1ubuntu3.7"
},
{
"binary_name": "dovecot-lmtpd",
"binary_version": "1:2.3.7.2-1ubuntu3.7"
},
{
"binary_name": "dovecot-lucene",
"binary_version": "1:2.3.7.2-1ubuntu3.7"
},
{
"binary_name": "dovecot-managesieved",
"binary_version": "1:2.3.7.2-1ubuntu3.7"
},
{
"binary_name": "dovecot-mysql",
"binary_version": "1:2.3.7.2-1ubuntu3.7"
},
{
"binary_name": "dovecot-pgsql",
"binary_version": "1:2.3.7.2-1ubuntu3.7"
},
{
"binary_name": "dovecot-pop3d",
"binary_version": "1:2.3.7.2-1ubuntu3.7"
},
{
"binary_name": "dovecot-sieve",
"binary_version": "1:2.3.7.2-1ubuntu3.7"
},
{
"binary_name": "dovecot-solr",
"binary_version": "1:2.3.7.2-1ubuntu3.7"
},
{
"binary_name": "dovecot-sqlite",
"binary_version": "1:2.3.7.2-1ubuntu3.7"
},
{
"binary_name": "dovecot-submissiond",
"binary_version": "1:2.3.7.2-1ubuntu3.7"
},
{
"binary_name": "mail-stack-delivery",
"binary_version": "1:2.3.7.2-1ubuntu3.7"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "dovecot",
"purl": "pkg:deb/ubuntu/dovecot@1:2.3.7.2-1ubuntu3.7?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:2.3.4.1-5ubuntu3",
"1:2.3.7.2-1ubuntu1",
"1:2.3.7.2-1ubuntu2",
"1:2.3.7.2-1ubuntu3",
"1:2.3.7.2-1ubuntu3.1",
"1:2.3.7.2-1ubuntu3.2",
"1:2.3.7.2-1ubuntu3.3",
"1:2.3.7.2-1ubuntu3.4",
"1:2.3.7.2-1ubuntu3.5",
"1:2.3.7.2-1ubuntu3.6",
"1:2.3.7.2-1ubuntu3.7"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "dovecot-auth-lua",
"binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
},
{
"binary_name": "dovecot-core",
"binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
},
{
"binary_name": "dovecot-gssapi",
"binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
},
{
"binary_name": "dovecot-imapd",
"binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
},
{
"binary_name": "dovecot-ldap",
"binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
},
{
"binary_name": "dovecot-lmtpd",
"binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
},
{
"binary_name": "dovecot-lucene",
"binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
},
{
"binary_name": "dovecot-managesieved",
"binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
},
{
"binary_name": "dovecot-mysql",
"binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
},
{
"binary_name": "dovecot-pgsql",
"binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
},
{
"binary_name": "dovecot-pop3d",
"binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
},
{
"binary_name": "dovecot-sieve",
"binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
},
{
"binary_name": "dovecot-solr",
"binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
},
{
"binary_name": "dovecot-sqlite",
"binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
},
{
"binary_name": "dovecot-submissiond",
"binary_version": "1:2.3.16+dfsg1-3ubuntu2.9"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "dovecot",
"purl": "pkg:deb/ubuntu/dovecot@1:2.3.16+dfsg1-3ubuntu2.9?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:2.3.13+dfsg1-1ubuntu3",
"1:2.3.16+dfsg1-3ubuntu1",
"1:2.3.16+dfsg1-3ubuntu2",
"1:2.3.16+dfsg1-3ubuntu2.1",
"1:2.3.16+dfsg1-3ubuntu2.2",
"1:2.3.16+dfsg1-3ubuntu2.4",
"1:2.3.16+dfsg1-3ubuntu2.6",
"1:2.3.16+dfsg1-3ubuntu2.7",
"1:2.3.16+dfsg1-3ubuntu2.8",
"1:2.3.16+dfsg1-3ubuntu2.9"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "dovecot-auth-lua",
"binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
},
{
"binary_name": "dovecot-core",
"binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
},
{
"binary_name": "dovecot-gssapi",
"binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
},
{
"binary_name": "dovecot-imapd",
"binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
},
{
"binary_name": "dovecot-ldap",
"binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
},
{
"binary_name": "dovecot-lmtpd",
"binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
},
{
"binary_name": "dovecot-managesieved",
"binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
},
{
"binary_name": "dovecot-mysql",
"binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
},
{
"binary_name": "dovecot-pgsql",
"binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
},
{
"binary_name": "dovecot-pop3d",
"binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
},
{
"binary_name": "dovecot-sieve",
"binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
},
{
"binary_name": "dovecot-solr",
"binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
},
{
"binary_name": "dovecot-sqlite",
"binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
},
{
"binary_name": "dovecot-submissiond",
"binary_version": "1:2.3.21+dfsg1-2ubuntu6.5"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "dovecot",
"purl": "pkg:deb/ubuntu/dovecot@1:2.3.21+dfsg1-2ubuntu6.5?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:2.3.20+dfsg1-1ubuntu3",
"1:2.3.21+dfsg1-2ubuntu1",
"1:2.3.21+dfsg1-2ubuntu2",
"1:2.3.21+dfsg1-2ubuntu4",
"1:2.3.21+dfsg1-2ubuntu5",
"1:2.3.21+dfsg1-2ubuntu6",
"1:2.3.21+dfsg1-2ubuntu6.1",
"1:2.3.21+dfsg1-2ubuntu6.2",
"1:2.3.21+dfsg1-2ubuntu6.3",
"1:2.3.21+dfsg1-2ubuntu6.4",
"1:2.3.21+dfsg1-2ubuntu6.5"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "dovecot-auth-lua",
"binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
},
{
"binary_name": "dovecot-core",
"binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
},
{
"binary_name": "dovecot-flatcurve",
"binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
},
{
"binary_name": "dovecot-gssapi",
"binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
},
{
"binary_name": "dovecot-imapd",
"binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
},
{
"binary_name": "dovecot-ldap",
"binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
},
{
"binary_name": "dovecot-lmtpd",
"binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
},
{
"binary_name": "dovecot-managesieved",
"binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
},
{
"binary_name": "dovecot-mysql",
"binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
},
{
"binary_name": "dovecot-pgsql",
"binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
},
{
"binary_name": "dovecot-pop3d",
"binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
},
{
"binary_name": "dovecot-sieve",
"binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
},
{
"binary_name": "dovecot-solr",
"binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
},
{
"binary_name": "dovecot-sqlite",
"binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
},
{
"binary_name": "dovecot-submissiond",
"binary_version": "1:2.4.2+dfsg1-3ubuntu2.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "dovecot",
"purl": "pkg:deb/ubuntu/dovecot@1:2.4.2+dfsg1-3ubuntu2.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:2.4.1+dfsg1-5ubuntu4",
"1:2.4.1+dfsg1-5ubuntu5",
"1:2.4.2+dfsg1-3ubuntu1",
"1:2.4.2+dfsg1-3ubuntu2",
"1:2.4.2+dfsg1-3ubuntu2.1"
]
}
],
"aliases": [],
"details": "The comparison used for the doveadm password and API key is not fully timing safe and can reveal the length of the configured secret. An attacker with access to the same network as the doveadm service, able to make repeated requests and measure response timing accurately, can learn the length of the secret, which reduces the effort needed to guess it. The secret value itself is not disclosed. Restrict network access to the doveadm service to trusted clients. Update to non-vulnerable version. No publicly available exploits are known.",
"id": "UBUNTU-CVE-2026-42393",
"modified": "2026-09-02T16:15:07Z",
"published": "2026-08-28T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-42393"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42393"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-42393"
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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