DeutschShown in its original language — a full translation is planned for a future version.
Dovecot: Mehrere Schwachstellen
view advisory published 2026-08-27
Ein Angreifer kann mehrere Schwachstellen in Dovecot ausnutzen, um Sicherheitsvorkehrungen zu umgehen, sensible Informationen offenzulegen, Daten zu manipulieren oder Denial-of-Service-Zustände herbeizuführen.
01
describes (28)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-73209US | — | — | ||
An attacker that has valid credentials can send crafted compressed data that causes the affected process to exhaust its stack and crash. The affected process is terminated, which c… | ||||
| CVE-2026-73208US | — | — | ||
An attacker that holds a token intended for a different purpose can authenticate, because when an OAuth2 token response does not contain a scope claim, the audience claim is used i… | ||||
| CVE-2026-52687US | — | — | ||
An attacker that has valid credentials can select a compression algorithm for the IMAP connection whose decompression state requires a large amount of memory, and open several such… | ||||
| CVE-2026-52681US | — | — | ||
Sieve CPU resource usage is tracked in the compiled script, so an attacker that has valid credentials can reset the accounting by repeatedly changing the active script. Compiled sc… | ||||
| CVE-2026-42395US | — | — | ||
A host listed as a trusted proxy can send forwarding information containing a NUL byte, which crashes the login process on the following login attempt. The login process is termina… | ||||
| CVE-2026-42393US | — | — | ||
The comparison used for the doveadm password and API key is not fully timing safe and can reveal the length of the configured secret. An attacker with access to the same network as… | ||||
| CVE-2026-42392US | — | — | ||
An attacker that has valid credentials can send an invalid IMAP URLFETCH command, which causes uninitialized memory to be included in the error response returned to the client. Pro… | ||||
| CVE-2026-42391US | — | — | ||
An unauthenticated attacker can send an IMAP ID command with a very large number of parameters before logging in, which causes memory and CPU usage to grow disproportionately. The… | ||||
| CVE-2026-42008US | — | — | ||
Forwarding information received from a host listed as a trusted proxy is not kept separate from Dovecot's own authentication fields, so a value sent by that host can be injected as… | ||||
| CVE-2026-42007US | — | — | ||
An attacker that has valid credentials can use a Sieve script with the editheader extension to trigger a use-after-free in the mail editing code, and to write memory contents beyon… | ||||
| CVE-2026-40205US | — | — | ||
An attacker that holds an OAuth2 token granting only part of the required scopes can authenticate, because when more than one scope is required in the configuration, the remote tok… | ||||
| CVE-2026-40204US | — | — | ||
None None None No publicly available exploits are known. | ||||
| CVE-2026-40203US | — | — | ||
When IMAP compression is enabled, the same compression state is reused across responses in a session, so response sizes depend on both attacker-supplied mail and other mail in the… | ||||
| CVE-2026-40019US | — | — | ||
An unauthenticated attacker can send a truncated quoted argument to the ManageSieve login process, which makes it spin in an infinite loop consuming CPU. This can cause degradation… | ||||
| CVE-2026-40018US | — | — | ||
None None None No publicly available exploits are known. | ||||
| CVE-2026-40017US | — | — | ||
An attacker that can send mail to a user can craft a message header whose values are chosen to collide in an internal hash table, which makes the IMAP THREAD command consume CPU di… | ||||
| CVE-2026-40015US | — | — | ||
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 c… | ||||
| CVE-2026-40014US | — | — | ||
An attacker that can send mail to a user can craft a message header that makes the IMAP THREAD command consume CPU disproportionate to the size of the message. When a mail client i… | ||||
| CVE-2026-40013US | — | — | ||
An attacker that has valid credentials can submit a Sieve script containing an extreme numeric literal, which causes an out-of-bounds write when the ManageSieve service compiles th… | ||||
| CVE-2026-33607US | — | — | ||
An attacker that has valid credentials can use IMAP LIST command to consume CPU. This can cause degradation or denial of service for IMAP. Monitor system for abnormal CPU usage and… | ||||
showing 20 of 28
02
references
External citations — patches, advisories, analysis.
- Red Hat Security Advisory RHSA-2026:76763 vom 2026-10-06external
- Red Hat Security Advisory RHSA-2026:79371 vom 2026-10-08external
- Amazon Linux Security Advisory ALAS2-2026-3935 vom 2026-09-29external
- Dovecot and Pigeonhole v2.4.5 release vom 2026-08-27external
- Dovecot Security Advisory vom 2026-08-27external
- Rocky Linux Security Advisory RLSA-2026:76763 vom 2026-10-07external
- Rocky Linux Security Advisory RLSA-2026:79371 vom 2026-10-10external
- Oracle Linux Security Advisory ELSA-2026-76763 vom 2026-10-07external
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