OXDC-ADV-2026-0001
Vulnerability from csaf_ox - Published: 2026-03-27 00:00 - Updated: 2026-03-27 00:00Summary
OX Dovecot Security Advisory OXDC-ADV-2026-0001
Severity
High
Notes
Terms of Use: This content is licensed under the Creative Commons Attribution-NoDerivatives 4.0 International License (https://creativecommons.org/licenses/by-nd/4.0/). If you distribute this content, you must provide attribution to Open-Xchange GmbH and provide a link to the original. You may not distribute a modified version of this content.
When cache is enabled, some passdb/userdb drivers incorrectly cache all users with same cache key, causing wrong cached information to be used for these users.
7.4 (High)
Vendor Fix
Install fixed version or disable caching either globally or for the impacted passdb/userdb drivers.
When sending invalid base64 SASL data, login process is disconnected from the auth server, causing all active authentication sessions to fail.
5.3 (Medium)
Vendor Fix
Install fixed version or disable concurrency in login processes (heavy perfomance penalty on large deployments).
ManageSieve AUTHENTICATE command crashes when using literal as SASL initial response.
7.5 (High)
Vendor Fix
Control access to ManageSieve port, or disable the service if it's not needed. Alternatively upgrade to a fixed version.
Dovecot has provided a script to use for attachment to text conversion. This script unsafely handles zip-style attachments.
4.3 (Medium)
Vendor Fix
Do not use the provided script, instead, use something else like FTS tika.
When dovecot has been configured to use per-domain passwd files, and they are placed one path component above /etc, or slash has been added to allowed characters, path traversal can happen if the domain component is directory partial.
5.3 (Medium)
Vendor Fix
Upgrade to fixed version, or use different authentication scheme that does not rely on paths. Alternatively you can also ensure that the per-domain passwd files are in some other location, such as /etc/dovecot/auth/%d.
If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot's LDAP authentication.
CWE-90 - Improper Neutralization of Special Elements used in an LDAP Query ('LDAP Injection')
Vendor Fix
Do not clear out auth_username_chars, or install fixed version.
Dovecot SQL based authentication can be bypassed when auth_username_chars is cleared by admin.
7.7 (High)
Vendor Fix
Do not clear auth_username_chars. If this is not possible, install latest fixed version.
A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU.
5.3 (Medium)
Vendor Fix
Use MTA capabilities to limit RFC 2231 MIME parameters in mail messages, or upgrade to fixed version where the processing is limited.
Sending "NOOP (((...)))" command with 4000 parenthesis open+close results in ~1MB extra memory usage. Longer commands will result in client disconnection. This 1 MB can be left allocated for longer time periods by not sending the command ending LF. So attacker could connect possibly from even a single IP and create 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit and killing the process and its other proxied connections.
4.3 (Medium)
Vendor Fix
Install fixed version, there is no other remediation.
Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory.
7.5 (High)
Vendor Fix
Protect access to managesieve protocol, or install fixed version.
Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An attacker can use this to determine the configured credentials.
7.4 (High)
Vendor Fix
Limit access to the doveadm http service port, install fixed version.
Dovecot OTP authentication is vulnerable to replay attack under specific conditions. If auth cache is enabled, and username is altered in passdb, then OTP credentials can be cached so that same OTP reply is valid.
6.8 (Medium)
Vendor Fix
If authentication happens over unsecure connection, switch to SCRAM protocol. Alternatively ensure the communcations are secured, and if possible switch to OAUTH2 or SCRAM.
References
Acknowledgments
Erik <erik@broadlux.com>
cavid@yeswehack
strokep@yeswehack
cookiejack15@yeswehack
whisperer@yeswehack
djvirus@yeswehack
ilyar@yeswehack
bksparajuli@yeswehack
hamizanazman@yeswehack
{
"document": {
"aggregate_severity": {
"text": "HIGH"
},
"category": "csaf_security_advisory",
"csaf_version": "2.0",
"distribution": {
"text": "Copyright \u00a9 Open-Xchange GmbH. All rights reserved.",
"tlp": {
"label": "GREEN",
"url": "https://www.first.org/tlp/"
}
},
"lang": "en-US",
"notes": [
{
"category": "legal_disclaimer",
"text": "This content is licensed under the Creative Commons Attribution-NoDerivatives 4.0 International License (https://creativecommons.org/licenses/by-nd/4.0/). If you distribute this content, you must provide attribution to Open-Xchange GmbH and provide a link to the original. You may not distribute a modified version of this content.",
"title": "Terms of Use"
}
],
"publisher": {
"category": "vendor",
"name": "Open-Xchange GmbH",
"namespace": "https://open-xchange.com/"
},
"references": [
{
"category": "self",
"summary": "Canonical CSAF document",
"url": "https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0001.json"
},
{
"category": "self",
"summary": "Markdown representation",
"url": "https://documentation.open-xchange.com/dovecot/security/advisories/md/2026/oxdc-adv-2026-0001.md"
},
{
"category": "self",
"summary": "HTML representation",
"url": "https://documentation.open-xchange.com/dovecot/security/advisories/html/2026/oxdc-adv-2026-0001.html"
},
{
"category": "self",
"summary": "Plain-text representation",
"url": "https://documentation.open-xchange.com/dovecot/security/advisories/txt/2026/oxdc-adv-2026-0001.txt"
}
],
"title": "OX Dovecot Security Advisory OXDC-ADV-2026-0001",
"tracking": {
"current_release_date": "2026-03-27T00:00:00+00:00",
"generator": {
"date": "2026-03-27T12:33:09+00:00",
"engine": {
"name": "OX CSAF",
"version": "1.0.0"
}
},
"id": "OXDC-ADV-2026-0001",
"initial_release_date": "2026-03-27T00:00:00+00:00",
"revision_history": [
{
"date": "2026-03-27T00:00:00+00:00",
"number": "1",
"summary": "Initial release"
},
{
"date": "2026-03-27T00:00:00+00:00",
"number": "2",
"summary": "Public release"
}
],
"status": "final",
"version": "2"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"branches": [
{
"category": "product_version",
"name": "3.1.0",
"product": {
"name": "OX Dovecot Pro 3.1.0",
"product_id": "OXDC-PRO_3.1.0",
"product_identification_helper": {
"cpe": "cpe:2.3:a:open-xchange:dovecot:3.1.0:*:*:*:*:*:*:*"
}
}
},
{
"category": "product_version",
"name": "3.1.2",
"product": {
"name": "OX Dovecot Pro 3.1.2",
"product_id": "OXDC-PRO_3.1.2",
"product_identification_helper": {
"cpe": "cpe:2.3:a:open-xchange:dovecot:3.1.2:*:*:*:*:*:*:*"
}
}
},
{
"category": "product_version",
"name": "3.1.3",
"product": {
"name": "OX Dovecot Pro 3.1.3",
"product_id": "OXDC-PRO_3.1.3",
"product_identification_helper": {
"cpe": "cpe:2.3:a:open-xchange:dovecot:3.1.3:*:*:*:*:*:*:*"
}
}
},
{
"category": "product_version",
"name": "2.3.0",
"product": {
"name": "OX Dovecot Pro 2.3.0",
"product_id": "OXDC-PRO_2.3.0",
"product_identification_helper": {
"cpe": "cpe:2.3:a:open-xchange:dovecot:2.3.0:*:*:*:*:*:*:*"
}
}
},
{
"category": "product_version",
"name": "2.3.22.1",
"product": {
"name": "OX Dovecot Pro 2.3.22.1",
"product_id": "OXDC-PRO_2.3.22.1",
"product_identification_helper": {
"cpe": "cpe:2.3:a:open-xchange:dovecot:2.3.22.1:*:*:*:*:*:*:*"
}
}
},
{
"category": "product_version",
"name": "3.1.4",
"product": {
"name": "OX Dovecot Pro 3.1.4",
"product_id": "OXDC-PRO_3.1.4",
"product_identification_helper": {
"cpe": "cpe:2.3:a:open-xchange:dovecot:3.1.4:*:*:*:*:*:*:*"
}
}
},
{
"category": "product_version",
"name": "3.0.2",
"product": {
"name": "OX Dovecot Pro 3.0.2",
"product_id": "OXDC-PRO_3.0.2",
"product_identification_helper": {
"cpe": "cpe:2.3:a:open-xchange:dovecot:3.0.2:*:*:*:*:*:*:*"
}
}
},
{
"category": "product_version",
"name": "3.0.5",
"product": {
"name": "OX Dovecot Pro 3.0.5",
"product_id": "OXDC-PRO_3.0.5",
"product_identification_helper": {
"cpe": "cpe:2.3:a:open-xchange:dovecot:3.0.5:*:*:*:*:*:*:*"
}
}
}
],
"category": "product_name",
"name": "OX Dovecot Pro"
},
{
"branches": [
{
"category": "product_version",
"name": "2.4.0",
"product": {
"name": "OX Dovecot CE 2.4.0",
"product_id": "OXDC-CE_2.4.0",
"product_identification_helper": {
"cpe": "cpe:2.3:a:open-xchange:dovecot:2.4.0:*:*:*:*:*:*:*"
}
}
},
{
"category": "product_version",
"name": "2.4.1",
"product": {
"name": "OX Dovecot CE 2.4.1",
"product_id": "OXDC-CE_2.4.1",
"product_identification_helper": {
"cpe": "cpe:2.3:a:open-xchange:dovecot:2.4.1:*:*:*:*:*:*:*"
}
}
},
{
"category": "product_version",
"name": "2.4.3",
"product": {
"name": "OX Dovecot CE 2.4.3",
"product_id": "OXDC-CE_2.4.3",
"product_identification_helper": {
"cpe": "cpe:2.3:a:open-xchange:dovecot:2.4.3:*:*:*:*:*:*:*"
}
}
}
],
"category": "product_name",
"name": "OX Dovecot CE"
}
],
"category": "vendor",
"name": "Open-Xchange GmbH"
}
]
},
"vulnerabilities": [
{
"acknowledgments": [
{
"names": [
"Erik \u003cerik@broadlux.com\u003e"
]
}
],
"cve": "CVE-2025-30189",
"cwe": {
"id": "CWE-1250",
"name": "Improper Preservation of Consistency Between Independent Representations of Shared State"
},
"discovery_date": "2025-07-24T22:04:36+00:00",
"ids": [
{
"system_name": "JIRA OX Bug",
"text": "DOV-7830"
}
],
"notes": [
{
"category": "description",
"text": "When cache is enabled, some passdb/userdb drivers incorrectly cache all users with same cache key, causing wrong cached information to be used for these users."
}
],
"product_status": {
"first_fixed": [
"OXDC-CE_2.4.1"
],
"last_affected": [
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
},
"remediations": [
{
"category": "vendor_fix",
"date": "2026-03-27T00:00:00+00:00",
"details": "Install fixed version or disable caching either globally or for the impacted passdb/userdb drivers.",
"product_ids": [
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
},
"products": [
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
}
],
"threats": [
{
"category": "impact",
"details": "After cached login, all subsequent logins are for same user."
},
{
"category": "exploit_status",
"details": "No publicly available exploits are known."
}
],
"title": "v2.4 regression: auth cache broken with several passdb / userdb"
},
{
"cve": "CVE-2025-59028",
"cwe": {
"id": "CWE-20",
"name": "Improper Input Validation"
},
"discovery_date": "2025-11-04T09:22:58+00:00",
"ids": [
{
"system_name": "JIRA OX Bug",
"text": "DOV-8349"
}
],
"notes": [
{
"category": "description",
"text": "When sending invalid base64 SASL data, login process is disconnected from the auth server, causing all active authentication sessions to fail."
}
],
"product_status": {
"first_fixed": [
"OXDC-PRO_3.1.2",
"OXDC-CE_2.4.3"
],
"last_affected": [
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
},
"remediations": [
{
"category": "vendor_fix",
"date": "2026-03-27T00:00:00+00:00",
"details": "Install fixed version or disable concurrency in login processes (heavy perfomance penalty on large deployments).",
"product_ids": [
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
},
"products": [
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
}
],
"threats": [
{
"category": "impact",
"details": "Invalid BASE64 data can be used to DoS a vulnerable server to break concurrent logins."
},
{
"category": "exploit_status",
"details": "No publicly available exploits are known."
}
],
"title": "Invalid base64 authentication can cause DoS for other logins"
},
{
"cve": "CVE-2025-59032",
"cwe": {
"id": "CWE-20",
"name": "Improper Input Validation"
},
"discovery_date": "2025-11-29T01:35:59+00:00",
"ids": [
{
"system_name": "JIRA OX Bug",
"text": "DOV-8508"
}
],
"notes": [
{
"category": "description",
"text": "ManageSieve AUTHENTICATE command crashes when using literal as SASL initial response."
}
],
"product_status": {
"first_fixed": [
"OXDC-CE_2.4.3",
"OXDC-PRO_3.1.3"
],
"last_affected": [
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
},
"remediations": [
{
"category": "vendor_fix",
"date": "2026-03-27T00:00:00+00:00",
"details": "Control access to ManageSieve port, or disable the service if it\u0027s not needed. Alternatively upgrade to a fixed version.",
"product_ids": [
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
}
],
"threats": [
{
"category": "impact",
"details": "This can be used to crash ManageSieve service repeatedly, making it unavailable for other users."
},
{
"category": "exploit_status",
"details": "No publicly available exploits are known."
}
],
"title": "v2.4/v3.1 regression: Pigeonhole: ManageSieve panic occurs with sieve-connect as a client"
},
{
"acknowledgments": [
{
"names": [
"cavid@yeswehack"
]
}
],
"cve": "CVE-2025-59031",
"cwe": {
"id": "CWE-200",
"name": "Exposure of Sensitive Information to an Unauthorized Actor"
},
"discovery_date": "2025-12-29T07:05:29+00:00",
"ids": [
{
"system_name": "JIRA OX Bug",
"text": "DOV-8584"
}
],
"notes": [
{
"category": "description",
"text": "Dovecot has provided a script to use for attachment to text conversion. This script unsafely handles zip-style attachments."
}
],
"product_status": {
"first_fixed": [
"OXDC-CE_2.4.3",
"OXDC-PRO_3.1.3",
"OXDC-PRO_2.3.22.1"
],
"last_affected": [
"OXDC-PRO_2.3.0"
]
},
"remediations": [
{
"category": "vendor_fix",
"date": "2026-03-27T00:00:00+00:00",
"details": "Do not use the provided script, instead, use something else like FTS tika.",
"product_ids": [
"OXDC-PRO_2.3.0"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
},
"products": [
"OXDC-PRO_2.3.0"
]
}
],
"threats": [
{
"category": "impact",
"details": "Attacker can use specially crafted OOXML documents to cause unintended files on the system to be indexed and subsequently ending up in FTS indexes."
},
{
"category": "exploit_status",
"details": "No publicly available exploits are known."
}
],
"title": "decode2text.sh OOXML extraction may follow symlinks and read unintended files during indexing"
},
{
"acknowledgments": [
{
"names": [
"strokep@yeswehack"
]
}
],
"cve": "CVE-2026-0394",
"cwe": {
"id": "CWE-22",
"name": "Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)"
},
"discovery_date": "2026-01-07T10:40:46+00:00",
"ids": [
{
"system_name": "JIRA OX Bug",
"text": "DOV-8591"
}
],
"notes": [
{
"category": "description",
"text": "When dovecot has been configured to use per-domain passwd files, and they are placed one path component above /etc, or slash has been added to allowed characters, path traversal can happen if the domain component is directory partial."
}
],
"product_status": {
"first_fixed": [
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
],
"last_affected": [
"OXDC-PRO_2.3.0"
]
},
"remediations": [
{
"category": "vendor_fix",
"date": "2026-03-27T00:00:00+00:00",
"details": "Upgrade to fixed version, or use different authentication scheme that does not rely on paths. Alternatively you can also ensure that the per-domain passwd files are in some other location, such as /etc/dovecot/auth/%d.",
"product_ids": [
"OXDC-PRO_2.3.0"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
},
"products": [
"OXDC-PRO_2.3.0"
]
}
],
"threats": [
{
"category": "impact",
"details": "This allows inadvertently reading /etc/passwd (or some other path which ends with passwd). If this file contains passwords, it can be used to authenticate wrongly, or if this is userdb, it can unexpectly make system users appear valid users. "
},
{
"category": "exploit_status",
"details": "No publicly available exploits are known."
}
],
"title": "auth: Path traversal in passwd-file passdb using `%d` (domain) escapes base directory and opens `/etc/passwd`Pre-auth path traversal in passwd-file passdb using `%d` (domain) escapes base directory and opens `/etc/passwd`"
},
{
"acknowledgments": [
{
"names": [
"cookiejack15@yeswehack"
]
}
],
"cve": "CVE-2026-27860",
"cwe": {
"id": "CWE-90",
"name": "Improper Neutralization of Special Elements used in an LDAP Query (\u0027LDAP Injection\u0027)"
},
"discovery_date": "2026-02-20T16:22:20+00:00",
"ids": [
{
"system_name": "JIRA OX Bug",
"text": "DOV-8775"
}
],
"notes": [
{
"category": "description",
"text": "If auth_username_chars is empty, it is possible to inject arbitrary LDAP filter to Dovecot\u0027s LDAP authentication."
}
],
"product_status": {
"first_fixed": [
"OXDC-CE_2.4.3",
"OXDC-PRO_3.1.4"
],
"last_affected": [
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
},
"remediations": [
{
"category": "vendor_fix",
"date": "2026-03-27T00:00:00+00:00",
"details": "Do not clear out auth_username_chars, or install fixed version.",
"product_ids": [
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 3.7,
"baseSeverity": "LOW",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
},
"products": [
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
}
],
"threats": [
{
"category": "impact",
"details": "This leads to potentially bypassing restrictions and allows probing of LDAP structure."
},
{
"category": "exploit_status",
"details": "No publicly available exploits are known."
}
],
"title": "v2.4/v3.1 regression: auth-ldap is not escaping usernames"
},
{
"acknowledgments": [
{
"names": [
"whisperer@yeswehack"
]
}
],
"cve": "CVE-2026-24031",
"cwe": {
"id": "CWE-89",
"name": "Improper Neutralization of Special Elements used in an SQL Command (\u0027SQL Injection\u0027)"
},
"discovery_date": "2026-02-23T09:45:13+00:00",
"ids": [
{
"system_name": "JIRA OX Bug",
"text": "DOV-8781"
}
],
"notes": [
{
"category": "description",
"text": "Dovecot SQL based authentication can be bypassed when auth_username_chars is cleared by admin."
}
],
"product_status": {
"first_fixed": [
"OXDC-CE_2.4.3",
"OXDC-PRO_3.1.4"
],
"last_affected": [
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
},
"remediations": [
{
"category": "vendor_fix",
"date": "2026-03-27T00:00:00+00:00",
"details": "Do not clear auth_username_chars. If this is not possible, install latest fixed version.",
"product_ids": [
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 7.7,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L",
"version": "3.1"
},
"products": [
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
}
],
"threats": [
{
"category": "impact",
"details": "This vulnerability allows bypassing authentication for any user and user enumeration."
},
{
"category": "exploit_status",
"details": "No publicly available exploits are known."
}
],
"title": "v2.4/v3.1 regression: SQL injection allows bypassing authentication"
},
{
"acknowledgments": [
{
"names": [
"djvirus@yeswehack"
]
}
],
"cve": "CVE-2026-27859",
"cwe": {
"id": "CWE-400",
"name": "Uncontrolled Resource Consumption"
},
"discovery_date": "2026-02-24T11:18:32+00:00",
"ids": [
{
"system_name": "JIRA OX Bug",
"text": "DOV-8787"
}
],
"notes": [
{
"category": "description",
"text": "A mail message containing excessive amount of RFC 2231 MIME parameters causes LMTP to use too much CPU."
}
],
"product_status": {
"first_fixed": [
"OXDC-PRO_3.0.5",
"OXDC-CE_2.4.3",
"OXDC-PRO_3.1.4"
],
"last_affected": [
"OXDC-PRO_3.0.2",
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
},
"remediations": [
{
"category": "vendor_fix",
"date": "2026-03-27T00:00:00+00:00",
"details": "Use MTA capabilities to limit RFC 2231 MIME parameters in mail messages, or upgrade to fixed version where the processing is limited.",
"product_ids": [
"OXDC-PRO_3.0.2",
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
},
"products": [
"OXDC-PRO_3.0.2",
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
}
],
"threats": [
{
"category": "impact",
"details": "A suitably formatted mail message causes mail delivery process to consume large amounts of CPU time."
},
{
"category": "exploit_status",
"details": "No publicly available exploits are known."
}
],
"title": "v3.0.2+ regression: Message headers MIME parameter parsing can cause excessive CPU usage"
},
{
"acknowledgments": [
{
"names": [
"whisperer@yeswehack"
]
}
],
"cve": "CVE-2026-27857",
"cwe": {
"id": "CWE-400",
"name": "Uncontrolled Resource Consumption"
},
"discovery_date": "2026-02-27T21:18:41+00:00",
"ids": [
{
"system_name": "JIRA OX Bug",
"text": "DOV-8816"
}
],
"notes": [
{
"category": "description",
"text": "Sending \"NOOP (((...)))\" command with 4000 parenthesis open+close results in ~1MB extra memory usage. Longer commands will result in client disconnection. This 1 MB can be left allocated for longer time periods by not sending the command ending LF. So attacker could connect possibly from even a single IP and create 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit and killing the process and its other proxied connections."
}
],
"product_status": {
"first_fixed": [
"OXDC-PRO_3.0.5",
"OXDC-CE_2.4.3",
"OXDC-PRO_3.1.4",
"OXDC-PRO_2.3.22.1"
],
"last_affected": [
"OXDC-PRO_2.3.0"
]
},
"remediations": [
{
"category": "vendor_fix",
"date": "2026-03-27T00:00:00+00:00",
"details": "Install fixed version, there is no other remediation.",
"product_ids": [
"OXDC-PRO_2.3.0"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
},
"products": [
"OXDC-PRO_2.3.0"
]
}
],
"threats": [
{
"category": "impact",
"details": "Attacker could connect possibly from even a single IP and create 1000 connections to allocate 1 GB of memory, which would likely result in reaching VSZ limit and killing the process and its other proxied connections."
},
{
"category": "exploit_status",
"details": "No publicly available exploits are known."
}
],
"title": "imap-login: Excessive memory usage DoS"
},
{
"acknowledgments": [
{
"names": [
"ilyar@yeswehack"
]
}
],
"cve": "CVE-2026-27858",
"cwe": {
"id": "CWE-400",
"name": "Uncontrolled Resource Consumption"
},
"discovery_date": "2026-02-28T20:40:17+00:00",
"ids": [
{
"system_name": "JIRA OX Bug",
"text": "DOV-8818"
}
],
"notes": [
{
"category": "description",
"text": "Attacker can send a specifically crafted message before authentication that causes managesieve to allocate large amount of memory.\r\n"
}
],
"product_status": {
"first_fixed": [
"OXDC-PRO_3.0.5",
"OXDC-CE_2.4.3",
"OXDC-PRO_3.1.4",
"OXDC-PRO_2.3.22.1"
],
"last_affected": [
"OXDC-PRO_2.3.0",
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
},
"remediations": [
{
"category": "vendor_fix",
"date": "2026-03-27T00:00:00+00:00",
"details": "Protect access to managesieve protocol, or install fixed version.",
"product_ids": [
"OXDC-PRO_2.3.0",
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"OXDC-PRO_2.3.0",
"OXDC-PRO_3.1.0",
"OXDC-CE_2.4.0"
]
}
],
"threats": [
{
"category": "impact",
"details": "Attacker can force managesieve-login to be unavailable by repeatedly crashing the process."
},
{
"category": "exploit_status",
"details": "No publicly available exploits are known."
}
],
"title": "managesieve-login out-of-memory DoS"
},
{
"acknowledgments": [
{
"names": [
"bksparajuli@yeswehack"
]
}
],
"cve": "CVE-2026-27856",
"cwe": {
"id": "CWE-287",
"name": "Improper Authentication"
},
"discovery_date": "2026-03-04T06:20:41+00:00",
"ids": [
{
"system_name": "JIRA OX Bug",
"text": "DOV-8830"
}
],
"notes": [
{
"category": "description",
"text": "Doveadm credentials are verified using direct comparison which is susceptible to timing oracle attack. An attacker can use this to determine the configured credentials."
}
],
"product_status": {
"first_fixed": [
"OXDC-PRO_3.0.5",
"OXDC-CE_2.4.3",
"OXDC-PRO_3.1.4",
"OXDC-PRO_2.3.22.1"
],
"last_affected": [
"OXDC-PRO_2.3.0"
]
},
"remediations": [
{
"category": "vendor_fix",
"date": "2026-03-27T00:00:00+00:00",
"details": "Limit access to the doveadm http service port, install fixed version.",
"product_ids": [
"OXDC-PRO_2.3.0"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.4,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
},
"products": [
"OXDC-PRO_2.3.0"
]
}
],
"threats": [
{
"category": "impact",
"details": "Figuring out the credential will lead into full access to the affected component."
},
{
"category": "exploit_status",
"details": "No publicly available exploits are known."
}
],
"title": "doveadm: Credentials verified without timing safety"
},
{
"acknowledgments": [
{
"names": [
"hamizanazman@yeswehack"
]
}
],
"cve": "CVE-2026-27855",
"cwe": {
"id": "CWE-294",
"name": "Authentication Bypass by Capture-replay"
},
"discovery_date": "2026-03-09T16:55:35+00:00",
"ids": [
{
"system_name": "JIRA OX Bug",
"text": "DOV-8859"
}
],
"notes": [
{
"category": "description",
"text": "Dovecot OTP authentication is vulnerable to replay attack under specific conditions. If auth cache is enabled, and username is altered in passdb, then OTP credentials can be cached so that same OTP reply is valid."
}
],
"product_status": {
"first_fixed": [
"OXDC-CE_2.4.3"
],
"last_affected": [
"OXDC-PRO_2.3.0"
]
},
"remediations": [
{
"category": "vendor_fix",
"date": "2026-03-27T00:00:00+00:00",
"details": "If authentication happens over unsecure connection, switch to SCRAM protocol. Alternatively ensure the communcations are secured, and if possible switch to OAUTH2 or SCRAM.",
"product_ids": [
"OXDC-PRO_2.3.0"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
"version": "3.1"
},
"products": [
"OXDC-PRO_2.3.0"
]
}
],
"threats": [
{
"category": "impact",
"details": "An attacker able to observe an OTP exchange is able to log in as the user."
},
{
"category": "exploit_status",
"details": "No publicly available exploits are known."
}
],
"title": "auth: OTP driver vulnerable to replay attack"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
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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