dovecot: Dovecot: Arbitrary Code Execution via Sieve editheader use-after-free

A flaw was found in Dovecot. An authenticated attacker can use a Sieve script with the editheader extension to trigger a use-after-free vulnerability in the mail editing code. This can lead to memory corruption, potentially crashing the mail delivery process and allowing for arbitrary code...

Important: dovecot

Issue Overview: An attacker that can send mail to a user can craft a message whose headers contain a very large number of email addresses or MIME parameters, which causes excessive memory usage when the message is later parsed. The message is still delivered, but reading it over IMAP can exhaust...

OPENSUSE-SU-2026:21720-1 Security update for dovecot24

This update for dovecot24 fixes the following issues: Update to 2.4.5. - CVE-2026-33263: submission-login: panic when mailmaxuseripconnections is reached bsc1276794. - CVE-2026-27852: DoS by sending mail with bad header bsc1276799. - CVE-2026-33604: SMTP smuggling via missing dot-stuffing after...

CVE-2026-42007

A flaw was found in Dovecot. An authenticated attacker can use a Sieve script with the editheader extension to trigger a use-after-free vulnerability in the mail editing code. This can lead to memory corruption, potentially crashing the mail delivery process and allowing for arbitrary code...

SUSE CVE-2026-42007

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...

Linux Distros Unpatched Vulnerability : CVE-2026-42007

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - 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...

CVE-2026-42007

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...

ALPINE-CVE-2026-42007

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...

AZL-98298 CVE-2026-42007 affecting package dovecot 2.3.20-1

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...

EUVD-2026-67672

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...

CVE-2026-42007

CVE-2026-42007 affects Dovecot mail server. An attacker with valid credentials can trigger a use-after-free in the mail editing code by submitting a Sieve script using the editheader extension . This leads to memory leak and potential memory corruption during mail delivery, which can crash the de...

CVE-2026-42007

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...

CVE-2026-42007

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...

CVE-2026-42007

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...

PT-2026-83065

Name of the Vulnerable Software and Affected Versions Email servers allowing Sieve scripts affected versions not specified Description An attacker with valid credentials can use a Sieve script with the editheader extension to trigger a use-after-free condition in the mail editing code. This allow...

UBUNTU-CVE-2026-42007

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...

CVE-2026-42007

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...

CVE-2026-42007: Use After Free

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...