9.1
Critical
CVE-2026-42007 An attacker that has valid credentials can use a Sieve script with the editheader extension to trigger a…
Description
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 beyond the intended buffer into the delivered mail. This causes memory leak and opportunity to do memory corruption during mail delivery, which can crash the delivery process and may allow execution of arbitrary code in the context of that process. Disable the Sieve editheader extension. Update to non-vulnerable version. No publicly available exploits are known.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| OX Dovecot Pro 3.1 | 3.1.0 → < 3.1.6 | 3.1.6 |
| OX Dovecot Pro 3.0 | 3.0.0 → < 3.0.7 | 3.0.7 |
| OX Dovecot Pro 2.3 | 2.3.0 → < 2.3.22.2 | 2.3.22.2 |
| OX Dovecot CE 2.3 | 2.3.0 → < 2.4.5 | 2.4.5 |
Other CVEs of OX Dovecot Pro
The 44 CVEs of OX Dovecot Pro →
CVE-2026-73209
An attacker that has valid credentials can send crafted compressed data that causes the affected process to exhaust…
6.5
Medium
CVE-2026-73208
An attacker that holds a token intended for a different purpose can authenticate, because when an OAuth2 token…
7.4
High
CVE-2026-52687
An attacker that has valid credentials can select a compression algorithm for the IMAP connection whose decompression…
6.5
Medium
CVE-2026-52681
Sieve CPU resource usage is tracked in the compiled script, so an attacker that has valid credentials can reset the…
3.1
Low