UBUNTU-CVE-2026-42007 (CVE-2026-42007)
Vulnerability from osv_ubuntu – Published: 2026-08-28 00:00 – Updated: 2026-09-02 16:15 – Source website
VLAI
Details
An attacker that has valid credentials can use a Sieve script with the editheader extension to trigger a use-after-free in the mail editing code, and to write memory contents beyond the intended buffer into the delivered mail. This causes memory leak and opportunity to do memory corruption during mail delivery, which can crash the delivery process and may allow execution of arbitrary code in the context of that process. Disable the Sieve editheader extension. Update to non-vulnerable version. No publicly available exploits are known.
Severity
9.1 (Critical)
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": [
{
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{
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}
],
"type": "ECOSYSTEM"
}
],
"versions": [
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"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"
}
],
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"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": [
{
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{
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}
],
"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": [
{
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}
],
"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",
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"1:2.3.21+dfsg1-2ubuntu6.2",
"1:2.3.21+dfsg1-2ubuntu6.3",
"1:2.3.21+dfsg1-2ubuntu6.4",
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]
},
{
"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": "An attacker that has valid credentials can use a Sieve script with the editheader extension to trigger a use-after-free in the mail editing code, and to write memory contents beyond the intended buffer into the delivered mail. This causes memory leak and opportunity to do memory corruption during mail delivery, which can crash the delivery process and may allow execution of arbitrary code in the context of that process. Disable the Sieve editheader extension. Update to non-vulnerable version. No publicly available exploits are known.",
"id": "UBUNTU-CVE-2026-42007",
"modified": "2026-09-02T16:15:07Z",
"published": "2026-08-28T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-42007"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42007"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-42007"
]
}
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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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