CVE-2026-6276

Severity CVSS v4.0:

Pending analysis

Type:

CWE-319 Cleartext Transmission of Sensitive Information

Publication date:

13/05/2026

Last modified:

14/05/2026

Description

Using libcurl, when a custom `Host:` header is first set for an HTTP request<br /> and a second request is subsequently done using the same *easy handle* but<br /> without the custom `Host:` header set, the second request would use stale<br /> information and pass on cookies meant for the first host in the second<br /> request. Leak them.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High