CVE-2026-4873

Severity CVSS v4.0:

Pending analysis

Type:

CWE-295 Improper Certificate Validation

Publication date:

13/05/2026

Last modified:

14/05/2026

Description

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

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS v3.1 Severity and Metrics:

Base Score: 5.90 MEDIUM
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): None
Availability (A): None