VULNERABILITY INTELLIGENCE

CVE-2026-4873

CVSS score5.9 MEDIUM

EPSS probability0.33%

CISA KEVNot currently listed

Published2026-05-13

Last modified2026-09-15

CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Description

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 transmit data unencrypted.

Weakness classification

CWE-295: Improper Certificate Validation
CWE-319: Cleartext Transmission of Sensitive Information

Primary references

2499f714-1537-4658-8207-48ae4bb9eae9 — Patch, Vendor Advisory
2499f714-1537-4658-8207-48ae4bb9eae9 — Vendor Advisory
2499f714-1537-4658-8207-48ae4bb9eae9 — Exploit, Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Patch, Third Party Advisory