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30impact

connection reuse ignores TLS requirement

curl · CVE-2026-4873
0 news outlets0 CERTs and agencies0 researchers

What is it?

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.

Evidence

No coverage recorded yet.

Exploitation

  • Public proof of concept
  • Exploited in the wild
  • Listed as known exploited
CVSS
5.9
EPSS
0.4%
First seen
2 d ago
Status
corroborated

All curl vulnerabilities