Description
Cyrus IMAP before 3.8.3 and 3.10.x before 3.10.0-rc1 allows authenticated attackers to cause unbounded memory allocation by sending many LITERALs in a single command.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | cyrus-imapd | 3.8.3-1 | — |
| Debian 13 | cyrus-imapd | 3.8.3-1 | — |
| Debian 12 | cyrus-imapd | 3.6.1-4+deb12u2 | DSA-5708-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | cyrus-imapd-2.4 | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | cyrus-imapd | 3.8.2-1ubuntu0.1~esm1 | USN-7224-1 |
| Ubuntu Pro 22.04 LTS | cyrus-imapd | 3.4.3-3ubuntu0.1+esm1 | USN-7224-1 |
| Ubuntu Pro 20.04 LTS | cyrus-imapd | 3.0.13-5ubuntu0.1~esm1 | USN-7224-1 |
| Ubuntu Pro 18.04 LTS | cyrus-imapd | 2.5.10-3ubuntu1.1+esm1 | USN-7224-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | perl-Cyrus +3 | 3.4.8-1.el9 | RHSA-2024:9195 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | perl-Cyrus +3 | 3.4.8-1.el9 | ALSA-2024:9195 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | cyrus-imapd | 3.4.8-1.el9 | RLSA-2024:9195 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | cyrus-imapd | 3.8.4-1.1 | openSUSE-SU-2025:14968-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | perl-Cyrus +3 | 3.4.8-1.el9 | ELSA-2024-9195 |
Advisories 8
- ALSA-2024:9195 Moderate: cyrus-imapd security update AlmaLinux Security Advisories · Oct 29, 2026
- USN-7224-1 cyrus-imapd vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- RHSA-2024:9195 Red Hat Security Advisory: cyrus-imapd security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- DSA-5708-1 cyrus-imapd - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2024:9195 Moderate: cyrus-imapd security update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2025:14968-1 cyradm-3.8.4-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-1291 cyrus imapd: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Jan 23, 2025
- ELSA-2024-9195 Moderate: cyrus-imapd security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 14, 2024
References
- https://github.com/cyrusimap/cyrus-imapd/commit/ef9e4e8314d6a06f2269af0ccf606894cc3fe489
- https://www.cyrusimap.org/imap/download/release-notes/3.8/x/3.8.3.html
- https://www.cyrusimap.org/dev/imap/download/release-notes/3.10/x/3.10.0-rc1.html
- FEDORA-2024-f3e0255c75 vendor-advisory
- FEDORA-2024-123f2b3666 vendor-advisory