CVE-2026-4873
Medium
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.
SeverityMedium
CVSS5.9
Exploit probability—
ProductHaxx Curl
PublishedMay 13, 2026
First seenMay 13, 2026
Weakness typeCWE-319CWE-319
How to fix
Update
- haxx curl8.20.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| haxx curl | 7.20.0 ≤ v < 8.20.0 | 8.20.0 |
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