EUVD-2026-67665
GHSA-qx86-c9pp-83v2
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Network-accessible service requiring valid credentials (PR:L); intermittent crash causes low availability impact (A:L) with no confirmed confidentiality or integrity effects.
Primary rating from Vendor (OX).
CVSS VectorVendor: OX
Lifecycle Timeline
2DescriptionCVE.org
An attacker that has valid credentials can open many connections to the imap-hibernate service and send invalid commands, which can intermittently cause an out-of-bounds read and crash the process. The crash interrupts hibernated IMAP sessions handled by the affected process, which can cause degradation of service for IMAP. Disable IMAP hibernation. Update to non-vulnerable version. No publicly available exploits are known.
AnalysisAI
Authenticated availability disruption in OX Dovecot Pro and OX Dovecot CE allows any valid credential holder to crash the imap-hibernate service by opening many concurrent connections and sending malformed IMAP commands, triggering an intermittent out-of-bounds read (CWE-125). The crash terminates the imap-hibernate process, dropping hibernated IMAP sessions for co-hosted users and degrading service availability. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Valid credentials for the targeted mail server are required - the CVSS PR:L metric confirms exploitation is not possible unauthenticated. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 4.3 Medium accurately captures the bounded impact: the attack is network-accessible with low complexity (AV:N/AC:L) but requires authenticated access (PR:L), and impact is limited to low availability (A:L) with no confidentiality or integrity effects. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | The primary remediation is to upgrade to the fixed version of OX Dovecot Pro or OX Dovecot CE as specified in the Open-Xchange advisory at https://documentation.open-xchange.com/dovecot/security/advisories/csaf/2026/oxdc-adv-2026-0003.json - exact fixed version numbers must be obtained from that source, as they were not available in the provided data. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-125 – Out-of-bounds Read
View allSame technique Information Disclosure
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External POC / Exploit Code
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