Vulnerability DatabaseCVE-2026-11856
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CVE-2026-11856
Published:June 24, 2026
Updated:June 24, 2026
Successfully using libcurl to do a transfer to a specific HTTP origin ("hostA") with Digest authentication and then changing the origin to a different one ("hostB") for a second transfer, reusing the same handle, makes libcurl wrongly pass on the "Authorization:" header field meant for "hostA", to "hostB".
Affected Packages
https://github.com/curl/curl.git (GITHUB):
Affected version(s) >=curl-7_10_6 <curl-8_21_0
Fix Suggestion:
Update to version curl-8_21_0
Related Resources (1)
https://curl.se/docs/CVE-2026-11856.html
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CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
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:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE