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 transmit data unencrypted.

Scoring

Severity

MEDIUM

CVSS base score

5.9

CVSS vector

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

EPSS probability

0.33%

CWE

CWE-319

Published

2026-05-13

Last modified

2026-09-17

Affected products

• curl curl
• curl curl
• curl curl
• curl curl
• curl curl
• curl curl
• curl curl
• curl curl

Weakness type

• CWE-319

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• CVE-2026-24060 — Automated Logic WebCTRL Premium Server Cleartext Transmission of Sensitive Information
• CVE-2025-54156 — Santesoft Sante PACS Server Cleartext Transmission of Sensitive Information
• CVE-2024-12378 — On affected platforms running Arista EOS with secure Vxlan configured, restarting the Tunnelsec agent will result in packets being sent over the secure Vxlan tunnels in the clear.
• CVE-2025-0556 — Telerik Report Server Clear Text Transmission of Agent Commands
• CVE-2026-32309 — Cryptomator: Hub unlocking accepts plaintext HTTP and unvalidated endpoint schemes

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