CVE-2026-47083

Cyrus IMAPd up to 3.12.2 contains a cross-user ESEARCH content oracle: an authenticated IMAP user can enumerate folder names under any account they can name, with search returning message UIDs (no full content access). Root cause: ESEARCH handling exposes per-account folder/UID metadata to other ...

ruby/net-imap: ruby: Net::IMAP: Denial of Service via large iteration count in SCRAM authentication

A flaw was found in Net::IMAP, a Ruby library for Internet Message Access Protocol IMAP client functionality. A hostile server can exploit this vulnerability during SCRAM-SHA1 or SCRAM-SHA256 Salted Challenge Response Authentication Mechanism - Secure Hash Algorithm 1 or 256 authentication by...

ruby: net-imap: Net::IMAP: Denial of Service via crafted IMAP responses

A flaw was found in Net::IMAP, a Ruby library implementing the Internet Message Access Protocol IMAP client functionality. A hostile server can exploit a quadratic time complexity issue in the Net::IMAP::ResponseReader when processing large responses containing numerous string literals. This can...

ruby/net-imap: ruby: Net::IMAP: IMAP Command Injection via Symbol Arguments

A flaw was found in Net::IMAP, a Ruby library that provides Internet Message Access Protocol IMAP client functionality. This vulnerability allows a remote attacker to inject arbitrary IMAP commands. This is achieved by passing specially crafted symbol arguments to IMAP commands. Successful...

ruby/net-imap: ruby: Net::IMAP: IMAP Command Injection via Symbol Arguments

A flaw was found in Net::IMAP, a Ruby library that provides Internet Message Access Protocol IMAP client functionality. This vulnerability allows a remote attacker to inject arbitrary IMAP commands. This is achieved by passing specially crafted symbol arguments to IMAP commands. Successful...

ruby/net-imap: ruby: Net::IMAP: IMAP Command Injection via Symbol Arguments

A flaw was found in Net::IMAP, a Ruby library that provides Internet Message Access Protocol IMAP client functionality. This vulnerability allows a remote attacker to inject arbitrary IMAP commands. This is achieved by passing specially crafted symbol arguments to IMAP commands. Successful...

RLSA-2026:33565 Important: ruby security update

Ruby is an extensible, interpreted, object-oriented, scripting language. It has features to process text files and to perform system management tasks. Security Fixes: ruby: net-imap: Net::IMAP: Denial of Service via crafted IMAP responses CVE-2026-42245 ruby/net-imap: ruby: Net::IMAP: IMAP Comman...

ruby/net-imap: ruby: Net::IMAP: IMAP Command Injection via Symbol Arguments

A flaw was found in Net::IMAP, a Ruby library that provides Internet Message Access Protocol IMAP client functionality. This vulnerability allows a remote attacker to inject arbitrary IMAP commands. This is achieved by passing specially crafted symbol arguments to IMAP commands. Successful...

CVE-2026-47242

Net::IMAP implements Internet Message Access Protocol IMAP client functionality in Ruby. Prior to 0.6.5 and 0.5.15, when Net::IMAPid is called with a hash argument, although the ID field value strings are correctly quoted escaping quoted specials, they were not validated to prohibit CRLF sequence...

[SECURITY] Fedora 44 Update: nginx-1.30.2-1.fc44

Nginx is a web server and a reverse proxy server for HTTP, SMTP, POP3 and IMAP protocols, with a strong focus on high concurrency, performance and low memory usage...

[SECURITY] Fedora 43 Update: nginx-1.30.1-1.fc43

Nginx is a web server and a reverse proxy server for HTTP, SMTP, POP3 and IMAP protocols, with a strong focus on high concurrency, performance and low memory usage...

CVE-2026-4873

A vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same connection pool. If an initial transfer is made in clear-text via IMAP, SMTP, or POP3, a subsequent request to that same host bypasses the TLS requirement and instead transm...

CVE-2026-42006

An attacker can cause uncontrolled memory usage with excessive bracing over IMAP. The fix in CVE-2026-27857 was incomplete, only blocking one way of doing this, so there was still another way left open. In particular, the fix was for closing braces, but you could still use open braces to bypass t...

PT-2026-40028

Name of the Vulnerable Software and Affected Versions dovecot versions prior to 2.4.4-1.1 Description An attacker can use the IMAP SETACL command to inject the anyone permission into a user's dovecot-acl file, bypassing the imap acl allow anyone=no configuration. This allows folders to be spammed...

Unity Linux 20.1060e / 20.1070e Security Update: ruby (UTSA-2026-017525)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-017525 advisory. An issue was discovered in Ruby through 2.6.7, 2.7.x through 2.7.3, and 3.x through 3.0.1. Net::IMAP does not raise an exception when StartTLS fails with an an unkno...

UBUNTU-CVE-2026-42257

Net::IMAP implements Internet Message Access Protocol IMAP client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, several Net::IMAP commands accept a raw string argument that is sent to the server without validation or escaping. If this string is derived from user-controlled...

CVE-2026-42257 net-imap: Command Injection via "raw" arguments to multiple commands

Net::IMAP implements Internet Message Access Protocol IMAP client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, several Net::IMAP commands accept a raw string argument that is sent to the server without validation or escaping. If this string is derived from user-controlled...

CVE-2026-42256 net-imap: Denial of service via high iteration count for `SCRAM-*` authentication

Net::IMAP implements Internet Message Access Protocol IMAP client functionality in Ruby. From versions 0.4.0 to before 0.4.24, 0.5.0 to before 0.5.14, and 0.6.0 to before 0.6.4, when authenticating a connection with SCRAM-SHA1 or SCRAM-SHA256, a hostile server can perform a computational...

CVE-2026-42245

Net::IMAP implements Internet Message Access Protocol IMAP client functionality in Ruby. Prior to versions 0.4.24, 0.5.14, and 0.6.4, Net::IMAP::ResponseReader has quadratic time complexity when reading large responses containing many string literals. A hostile server can send responses which are...

CVE-2026-43859

A flaw was found in mutt, an email client, where it mishandles cryptographic digests used for IMAP Internet Message Access Protocol authentication. This incorrect handling could lead to a low integrity impact, potentially allowing a remote attacker to subtly affect the authentication process...