CVE-2026-11856

Severity CVSS v4.0:

Pending analysis

Type:

Unavailable / Other

Publication date:

03/07/2026

Last modified:

07/07/2026

Description

Successfully using libcurl to do a transfer to a specific HTTP origin<br /> (`hostA`) with **Digest** authentication and then changing the origin to a<br /> different one (`hostB`) for a second transfer, reusing the same handle, makes<br /> libcurl wrongly pass on the `Authorization:` header field meant for `hostA`,<br /> to `hostB`.

Impact

Vector 3.x

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

Base Score: 9.80 CRITICAL
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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