CVE-2026-61911

An issue was discovered in Cyrus IMAP before 3.12.4. There is a Sieve mailbox existence oracle. An authenticated user could install a Sieve script that probed whether another user's private mailbox existed, or read the value of shared mailbox annotations, by observing which fileinto branch fired...

DEBIAN-CVE-2026-61908

An issue was discovered in Cyrus IMAP before 3.12.4. A JMAP email-header blob ID can reference an out-of-bounds index. An authenticated user could attempt to download a crafted JMAP blob ID of the form H-, which could read past the end of the internal blobheaders array during download, exposing...

DEBIAN-CVE-2026-61909

An issue was discovered in Cyrus IMAP before 3.12.4. CalDAV/CardDAV multiget bypasses a per-href ACL. An authenticated DAV user with some shared access to another user's calendar or address book could read even unshared events or contacts by including the target hrefs in a calendar-multiget or...

DEBIAN-CVE-2026-61910

An issue was discovered in Cyrus IMAP before 3.12.4. Mailbox/set let a sharee change a special-use role on shared mailboxes. An authenticated user with maySetKeywords on another user's mailbox could change that mailbox's specialuse annotation. This could allow the sharee to change the shared...

CVE-2026-61910

An issue was discovered in Cyrus IMAP before 3.12.4. Mailbox/set let a sharee change a special-use role on shared mailboxes. An authenticated user with maySetKeywords on another user's mailbox could change that mailbox's specialuse annotation. This could allow the sharee to change the shared...

CVE-2026-61907

An issue was discovered in Cyrus IMAP before 3.12.4. JMAP snooze bypasses the destination-mailbox ACL. An authenticated user with insert permissions on another user's snoozed mailbox could cause insertion of mail to that user's inbox, or any other of their mailboxes whose id was known to the user...

DEBIAN-CVE-2026-61907

An issue was discovered in Cyrus IMAP before 3.12.4. JMAP snooze bypasses the destination-mailbox ACL. An authenticated user with insert permissions on another user's snoozed mailbox could cause insertion of mail to that user's inbox, or any other of their mailboxes whose id was known to the user...

Updated dovecot package fixes security vulnerabilities

submission-login: Panic when mailmaxuseripconnections is reached: Panic: epollctldel, 8 failed: Bad file descriptor. CVE-2026-33263 Dovecot IMAP LIST matchsub Exponential Backtracking — CPU Denial of Service. CVE-2026-33607 DoS by sending mail with bad header. CVE-2026-27852 dsync: Mail content c...

CVE-2026-61911: Exposure of Sensitive System Information to an Unauthorized Control Sphere

An issue was discovered in Cyrus IMAP before 3.12.4. There is a Sieve mailbox existence oracle. An authenticated user could install a Sieve script that probed whether another user's private mailbox existed, or read the value of shared mailbox annotations, by observing which fileinto branch fired...

CVE-2026-61909

An issue was discovered in Cyrus IMAP before 3.12.4. CalDAV/CardDAV multiget bypasses a per-href ACL. An authenticated DAV user with some shared access to another user's calendar or address book could read even unshared events or contacts by including the target hrefs in a calendar-multiget or...

CVE-2026-61907

This vulnerability affects Cyrus IMAP prior to version 3.12.4 , where the JMAP snooze operation bypasses the destination-mailbox ACL . An authenticated user who holds insert permissions on another user's snoozed mailbox can force mail insertion into that user's inbox or any other mailbox whose ID...

CVE-2026-61908

An out-of-bounds read vulnerability in Cyrus IMAP before 3.12.4 (also fixed in 3.10.4 and 3.8.8) allows an authenticated user to download a crafted JMAP email-header blob ID of the form H-, which reads past the end of the internal blob_headers array, potentially exposing adjacent heap memory . NV...

CVE-2026-61915

Cyrus IMAP before 3.12.4 is affected by a VPATCH BYPARAM double-free in the CalDAV worker. An authenticated calendar user can trigger a crash by sending a PATCH request with PATCH-ACTION="BYPARAM@..." against a resource that has two or more properties of the matched kind, causing the memory holdi...

CVE-2026-61908: Out-of-bounds Read

An issue was discovered in Cyrus IMAP before 3.12.4. A JMAP email-header blob ID can reference an out-of-bounds index. An authenticated user could attempt to download a crafted JMAP blob ID of the form H - , which could read past the end of the internal blobheaders array during download, exposing...

PT-2026-89135

An issue was discovered in Cyrus IMAP before 3.12.4. A JMAP email-header blob ID can reference an out-of-bounds index. An authenticated user could attempt to download a crafted JMAP blob ID of the form H-, which could read past the end of the internal blob headers array during download, exposing...

EUVD-2026-75129

An issue was discovered in Cyrus IMAP before 3.12.4. There is a Sieve mailbox existence oracle. An authenticated user could install a Sieve script that probed whether another user's private mailbox existed, or read the value of shared mailbox annotations, by observing which fileinto branch fired...

EUVD-2026-75132

An issue was discovered in Cyrus IMAP before 3.12.4. CalDAV/CardDAV multiget bypasses a per-href ACL. An authenticated DAV user with some shared access to another user's calendar or address book could read even unshared events or contacts by including the target hrefs in a calendar-multiget or...

CVE-2026-61909

Cyrus IMAP before 3.12.4 (backported to 3.10.4 and 3.8.8) contains an ACL bypass in its CalDAV/CardDAV multiget functionality. An authenticated DAV user who holds some shared access to another user's calendar or address book can read unshared events or contacts by including target hrefs in a cale...

CVE-2026-61910

An issue was discovered in Cyrus IMAP before 3.12.4. Mailbox/set let a sharee change a special-use role on shared mailboxes. An authenticated user with maySetKeywords on another user's mailbox could change that mailbox's specialuse annotation. This could allow the sharee to change the shared...

CVE-2026-61911

An issue was discovered in Cyrus IMAP before 3.12.4. There is a Sieve mailbox existence oracle. An authenticated user could install a Sieve script that probed whether another user's private mailbox existed, or read the value of shared mailbox annotations, by observing which fileinto branch fired...