CVE-2026-4873
MEDIUM EPSS 24.6%
Published May 13, 20261mo ago · Modified Jun 17, 20261w ago
5.9 CVSS 3.1
Published May 13, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability None
Threat Intelligence
EPSS Exploit Probability
24.6% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available
Weaknesses 2
CWE-295
CWE-319
Affected Products 1
| Vendor | Product | Version | Range |
|---|---|---|---|
| haxx | curl | * | ≥7.20.0 – <8.20.0 |
References 4
- openwall.com http://www.openwall.com/lists/oss-security/2026/04/29/7
- curl.se https://curl.se/docs/CVE-2026-4873.html
- curl.se https://curl.se/docs/CVE-2026-4873.json
- hackerone.com https://hackerone.com/reports/3621851
Remediation
- openwall.com http://www.openwall.com/lists/oss-security/2026/04/29/7
- curl.se https://curl.se/docs/CVE-2026-4873.html