# OPENSUSE-SU-2026:21720-1: dovecot24 security update OPENSUSE-SU-2026:21720-1, released September 1, 2026, fixes 24 CVEs in dovecot24 (version 2.4.4-160000.2.1). None of them is reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/fix/linux/opensuse-su-2026-21720-1 - Platform: Linux - Released: Sep 1, 2026 - Priority: High (Closes CVE-2026-33263, high severity) - CVEs: 24, exploited: 0, on CISA KEV: 0 - Vendor advisory: https://osv.dev/vulnerability/openSUSE-SU-2026:21720-1 ## Applies to | Product | Release | Fixed in | |---|---|---| | [dovecot24](https://patchblox.com/security/data/product/linux/dovecot24.md) | opensuse-leap 16.0 | 2.4.4-160000.2.1 | ## CVEs this fix closes | CVE | Priority | Title | CVSS | EPSS | Exploitation | |---|---|---|---:|---:|---| | [CVE-2026-33263](https://patchblox.com/security/data/cve/CVE-2026-33263.md) | High | dovecot: When mail_max_userip_connections is set (default 10) and reached, submission-login can crash with epoll() panic cause... | 9.1 | 0.0055 | | | [CVE-2026-33605](https://patchblox.com/security/data/cve/CVE-2026-33605.md) | High | dovecot: An unauthenticated attacker can crash the ManageSieve login process by sending a small malformed command before authe... | 9.1 | 0.0045 | | | [CVE-2026-42391](https://patchblox.com/security/data/cve/CVE-2026-42391.md) | High | dovecot: An unauthenticated attacker can send an IMAP ID command with a very large number of parameters before logging in, whi... | 9.1 | 0.0045 | | | [CVE-2026-27852](https://patchblox.com/security/data/cve/CVE-2026-27852.md) | High | dovecot: Dovecot is an IMAP server for Linux and other UNIX-like systems, written primarily with security in mind | 9.1 | 0.0043 | | | [CVE-2026-42007](https://patchblox.com/security/data/cve/CVE-2026-42007.md) | High | dovecot: An attacker that has valid credentials can use a Sieve script with the editheader extension to trigger a use-after-fr... | 9.1 | 0.0035 | | | [CVE-2026-40018](https://patchblox.com/security/data/cve/CVE-2026-40018.md) | High | dovecot: None None None No publicly available exploits are known. | 9.1 | 0.0032 | | | [CVE-2026-73208](https://patchblox.com/security/data/cve/CVE-2026-73208.md) | High | dovecot: An attacker that holds a token intended for a different purpose can authenticate, because when an OAuth2 token respon... | 9.1 | 0.0031 | | | [CVE-2026-40013](https://patchblox.com/security/data/cve/CVE-2026-40013.md) | Routine | dovecot: An attacker that has valid credentials can submit a Sieve script containing an extreme numeric literal, which causes... | 4.3 | 0.0087 | | | [CVE-2026-33607](https://patchblox.com/security/data/cve/CVE-2026-33607.md) | Routine | dovecot: An attacker that has valid credentials can use IMAP LIST command to consume CPU | 4.3 | 0.0055 | | | [CVE-2026-40015](https://patchblox.com/security/data/cve/CVE-2026-40015.md) | Routine | dovecot: An attacker that has valid credentials can open many connections to the imap-hibernate service and send invalid comma... | 4.3 | 0.0055 | | | [CVE-2026-52687](https://patchblox.com/security/data/cve/CVE-2026-52687.md) | Routine | dovecot: An attacker that has valid credentials can select a compression algorithm for the IMAP connection whose decompression... | 6.5 | 0.0040 | | | [CVE-2026-73209](https://patchblox.com/security/data/cve/CVE-2026-73209.md) | Routine | dovecot: An attacker that has valid credentials can send crafted compressed data that causes the affected process to exhaust i... | 6.5 | 0.0040 | | | [CVE-2026-42395](https://patchblox.com/security/data/cve/CVE-2026-42395.md) | Routine | dovecot: A host listed as a trusted proxy can send forwarding information containing a NUL byte, which crashes the login proce... | 4.3 | 0.0035 | | | [CVE-2026-40014](https://patchblox.com/security/data/cve/CVE-2026-40014.md) | Routine | dovecot: An attacker that can send mail to a user can craft a message header that makes the IMAP THREAD command consume CPU di... | 6.5 | 0.0033 | | | [CVE-2026-40017](https://patchblox.com/security/data/cve/CVE-2026-40017.md) | Routine | dovecot: An attacker that can send mail to a user can craft a message header whose values are chosen to collide in an internal... | 6.5 | 0.0033 | | | [CVE-2026-33604](https://patchblox.com/security/data/cve/CVE-2026-33604.md) | Routine | dovecot: An attacker that can get Dovecot to relay a message, for example through Sieve redirect or submission relay, can use... | 5.9 | 0.0031 | | | [CVE-2026-52681](https://patchblox.com/security/data/cve/CVE-2026-52681.md) | Routine | dovecot: Sieve CPU resource usage is tracked in the compiled script, so an attacker that has valid credentials can reset the a... | 3.1 | 0.0030 | | | [CVE-2026-42392](https://patchblox.com/security/data/cve/CVE-2026-42392.md) | Routine | dovecot: An attacker that has valid credentials can send an invalid IMAP URLFETCH command, which causes uninitialized memory t... | 4.3 | 0.0027 | | | [CVE-2026-40203](https://patchblox.com/security/data/cve/CVE-2026-40203.md) | Routine | dovecot: When IMAP compression is enabled, the same compression state is reused across responses in a session, so response siz... | 3.7 | 0.0026 | | | [CVE-2026-33606](https://patchblox.com/security/data/cve/CVE-2026-33606.md) | Routine | dovecot: Mail content stored by a user can be crafted so that it is interpreted as dsync protocol commands when an administrat... | 4.8 | 0.0025 | | | [CVE-2026-42008](https://patchblox.com/security/data/cve/CVE-2026-42008.md) | Routine | dovecot: Forwarding information received from a host listed as a trusted proxy is not kept separate from Dovecot's own authent... | 4.3 | 0.0024 | | | [CVE-2026-40205](https://patchblox.com/security/data/cve/CVE-2026-40205.md) | Routine | dovecot: An attacker that holds an OAuth2 token granting only part of the required scopes can authenticate, because when more... | 5.9 | 0.0021 | | | [CVE-2026-40204](https://patchblox.com/security/data/cve/CVE-2026-40204.md) | Routine | dovecot: None None None No publicly available exploits are known. | 3.1 | 0.0021 | | | [CVE-2026-42393](https://patchblox.com/security/data/cve/CVE-2026-42393.md) | Routine | dovecot: The comparison used for the doveadm password and API key is not fully timing safe and can reveal the length of the co... | 3.1 | 0.0017 | | --- Data as of 2026-11-10T13:56:55Z UTC. 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