Medium · published May 13, 2026
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.
| Product | Versions | Fixed in |
|---|---|---|
| haxx/curl | ≥ 7.20.0, < 8.20.0 | 8.20.0 |