Bug 2531318

Summary: CVE-2026-61911 cyrus-imapd: cyrus-imapd: Sieve fileinto mailbox existence oracle [fedora-all]
Product: [Fedora] Fedora Reporter: Vladimir Vasilev <vvasilev>
Component: cyrus-imapdAssignee: Martin Osvald 🛹 <mosvald>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: fhrdina, jorton, j, mosvald, pavel, zdohnal
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["c9492595-ae5f-4286-aada-0d7116219f43"]}
Fixed In Version: cyrus-imapd-3.12.4-1.fc45 cyrus-imapd-3.10.4-1.fc43 cyrus-imapd-3.12.4-1.fc44 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-09-23 00:16:40 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2526313    

Description Vladimir Vasilev 2026-09-10 08:37:24 UTC
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 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 during LMTP delivery.

Comment 1 Fedora Update System 2026-09-14 09:21:10 UTC
FEDORA-2026-3bf3e31ef4 (cyrus-imapd-3.12.4-1.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-3bf3e31ef4

Comment 2 Fedora Update System 2026-09-14 09:21:31 UTC
FEDORA-2026-740bc1c6fa (cyrus-imapd-3.12.4-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-740bc1c6fa

Comment 3 Fedora Update System 2026-09-14 09:21:43 UTC
FEDORA-2026-97a7ec5786 (cyrus-imapd-3.10.4-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-97a7ec5786

Comment 4 Fedora Update System 2026-09-15 01:26:33 UTC
FEDORA-2026-3bf3e31ef4 has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-3bf3e31ef4`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-3bf3e31ef4

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 5 Fedora Update System 2026-09-15 01:42:03 UTC
FEDORA-2026-740bc1c6fa has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-740bc1c6fa`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-740bc1c6fa

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 6 Fedora Update System 2026-09-15 02:04:14 UTC
FEDORA-2026-97a7ec5786 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-97a7ec5786`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-97a7ec5786

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 7 Fedora Update System 2026-09-23 00:16:40 UTC
FEDORA-2026-3bf3e31ef4 (cyrus-imapd-3.12.4-1.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 8 Fedora Update System 2026-09-23 00:58:06 UTC
FEDORA-2026-97a7ec5786 (cyrus-imapd-3.10.4-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 9 Fedora Update System 2026-09-23 01:09:38 UTC
FEDORA-2026-740bc1c6fa (cyrus-imapd-3.12.4-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.