CVE-2026-40015
published 2026-08-28CVE-2026-40015: An attacker that has valid credentials can open many connections to the imap-hibernate service and send invalid commands, which can intermittently cause an…
PriorityP424medium4.3CVSS 3.1
AVNACLPRLUINSUCNINAL
EPSS
0.55%
45.5th percentile
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.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| dovecot | dovecot | — | — |
| open-xchange_gmbh | ox_dovecot_ce | >= 2.3.0 < 2.4.5 | 2.4.5 |
| open-xchange_gmbh | ox_dovecot_pro | >= 2.3.0 < 2.3.22.2 | 2.3.22.2 |
| open-xchange_gmbh | ox_dovecot_pro | >= 3.0.0 < 3.0.7 | 3.0.7 |
| open-xchange_gmbh | ox_dovecot_pro | >= 3.1.0 < 3.1.6 | 3.1.6 |
CVSS provenance
nvdv3.14.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
vendor_redhat4.3MEDIUM
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GHSA
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.
ghsa_unreviewed·2026-08-28
CVE-2026-40015 [MEDIUM] CWE-125 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.
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.
Red Hat
dovecot: Dovecot: Denial of Service via malformed IMAP commands in imap-hibernate service
vendor_redhat·2026-08-28·CVSS 4.3
CVE-2026-40015 [MEDIUM] CWE-125 dovecot: Dovecot: Denial of Service via malformed IMAP commands in imap-hibernate service
dovecot: Dovecot: Denial of Service via malformed IMAP commands in imap-hibernate service
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.
A flaw was found in Dovecot's imap-hibernate service. An authenticated attacker can open numerous connections and send malformed commands, leading to an out-of-bounds read. This can intermittently crash the process, interrupting hibernated IMAP sessions and causing a denial of se
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-40015 dovecot: Dovecot: Denial of Service via malformed IMAP commands in imap-hibernate service [fedora-all]
bugzilla·2026-09-01·CVSS 4.3
CVE-2026-40015 [MEDIUM] CVE-2026-40015 dovecot: Dovecot: Denial of Service via malformed IMAP commands in imap-hibernate service [fedora-all]
CVE-2026-40015 dovecot: Dovecot: Denial of Service via malformed IMAP commands in imap-hibernate service [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-40015 dovecot: Dovecot: Denial of Service via malformed IMAP commands in imap-hibernate service
bugzilla·2026-08-28·CVSS 4.3
CVE-2026-40015 [MEDIUM] CVE-2026-40015 dovecot: Dovecot: Denial of Service via malformed IMAP commands in imap-hibernate service
CVE-2026-40015 dovecot: Dovecot: Denial of Service via malformed IMAP commands in imap-hibernate service
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.
2026-08-28
Published