Vulnerability DatabaseCVE-2026-4873
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CVE-2026-4873
Published:May 13, 2026
Updated:May 16, 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.
Affected Packages
https://github.com/curl/curl.git (GITHUB):
Affected version(s) >=curl-7_20_0 <curl-8_20_0
Fix Suggestion:
Update to version curl-8_20_0
Related Resources (5)
http://www.openwall.com/lists/oss-security/2026/04/29/7
https://curl.se/docs/CVE-2026-4873.json
https://curl.se/docs/CVE-2026-4873.html
https://hackerone.com/reports/3621851
https://seclists.org/oss-sec/2026/q2/265
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CVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Improper Certificate Validation
CWE-295
Cleartext Transmission of Sensitive Information
CWE-319
EPSS
Base Score:
0.02