Why Malwarebytes blocks some Yahoo Mail redirects

Some Malwarebytes users have recently noticed frequent web protection alerts while reading email in Yahoo Mail’s web interface. These alerts are caused by background connections from the Yahoo Mail page to a set of third‑party domains that our products and other security tools currently classify ...

CLSA-2026-1778750122 Fix CVE(s): CVE-2026-27857

SECURITY UPDATE: imap-login excessive memory usage DoS ELSCVE-123445 - debian/patches/CVE-2026-27857.patch: limit IMAP parser open list count via new imapparserparams struct; cap pre-auth IMAPLOGINLISTCOUNTLIMIT to 1. Squashes upstream commits 825bc297, d0f67b52, af1fb4da, 3435e0d44. -...

EUVD-2026-29922

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-2026-41132

CKAN is an open-source DMS data management system for powering data hubs and data portals. Prior to 2.10.10 and 2.11.5, the configured SMTP server may be spoofed with any certificate e.g. self-signed, leaving credentials and all emails sent open to MITM attacks. This vulnerability is fixed in...

CVE-2026-41132

CKAN is an open-source DMS data management system for powering data hubs and data portals. Prior to 2.10.10 and 2.11.5, the configured SMTP server may be spoofed with any certificate e.g. self-signed, leaving credentials and all emails sent open to MITM attacks. This vulnerability is fixed in...

CVE-2026-41132

CVE-2026-41132 affects CKAN prior to versions 2.10.10 and 2.11.5, where the SMTP connection lacks certificate validation. This allows a MITM attacker to spoof the SMTP server and potentially access credentials and email contents. The issue is mitigated by upgrading CKAN to 2.10.10 or 2.11.5 (or n...

EUVD-2026-29911

Stack-based buffer overflow vulnerability exists in GUARDIANWALL MailSuite and GUARDIANWALL Mail Security Cloud SaaS version. If a remote attacker sends a specially crafted request to the product's web service, arbitrary code may be executed when the product is configured to run pop3wallpasswd wi...

CLSA-2026-1778690918 exim: Fix of CVE-2026-40686

CVE-2026-40686: out-of-bounds read in the GETUTF8INC macro in src/expand.c when processing malformed UTF-8 in expansion operators with utf8 enabled, potentially disclosing heap data via SMTP rejection messages...

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-2026-4873

CVE-2026-4873 is a TLS-reuse issue observed in curl-related advisories. The vulnerability arises when a TLS-requiring connection reuses an existing unencrypted connection from the same pool: if the initial transfer is unencrypted (e.g., via IMAP, SMTP, or POP3), a subsequent request to the same h...

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-2026-4873 connection reuse ignores TLS requirement

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-2026-4873 connection reuse ignores TLS requirement

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-2026-4873

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-2026-32661

Stack-based buffer overflow vulnerability exists in GUARDIANWALL MailSuite and GUARDIANWALL Mail Security Cloud SaaS version. If a remote attacker sends a specially crafted request to the product's web service, arbitrary code may be executed when the product is configured to run pop3wallpasswd wi...

CVE-2026-32661

Stack-based buffer overflow vulnerability exists in GUARDIANWALL MailSuite and GUARDIANWALL Mail Security Cloud SaaS version. If a remote attacker sends a specially crafted request to the product's web service, arbitrary code may be executed when the product is configured to run pop3wallpasswd wi...

CVE-2026-32661

Stack-based buffer overflow vulnerability exists in GUARDIANWALL MailSuite and GUARDIANWALL Mail Security Cloud SaaS version. If a remote attacker sends a specially crafted request to the product's web service, arbitrary code may be executed when the product is configured to run pop3wallpasswd wi...

CVE-2026-32661

CVE-2026-32661 affects GUARDIANWALL MailSuite and GUARDIANWALL Mail Security Cloud (SaaS). The issue is a stack-based buffer overflow in the pop3wallpasswd command when run with the grdnwww user privilege, allowing a remote attacker to execute arbitrary code via a crafted web-service request. CVS...

aad-fastapi-dl37 (>=1.0.0 <=1.0.2), agentiq (>=1.2.0a20250730 <=1.2.0rc4) +170 more potentially affected by CVE-2026-44681 via authlib (>=1.0.0 <=1.6.11)

authlib PYPI version =1.0.0, =1.0.0, =1.2.0a20250730, =1.1.0, =1.2.0a20250730, =0.1.0, =0.1.0a1, =1.2.0, =1.2.0a20250730, =1.2.0a20250730, =1.2.0a20250730, =1.2.0, =1.2.0a20250730, =1.2.0a20250730, =1.2.0a20250730, =1.2.0a20250730, =1.2.0rc4 and more Source cves: CVE-2026-44681 Source advisory:...

PT-2026-40577

Name of the Vulnerable Software and Affected Versions GUARDIANWALL MailSuite affected versions not specified GUARDIANWALL Mail Security Cloud SaaS version affected versions not specified Description A stack-based buffer overflow allows a remote attacker to execute arbitrary code by sending a...