Using libcurl, when a custom `Host:` header is first set for an HTTP request
and a second request is subsequently done using the same *easy handle* but
without the custom `Host:` header set, the second request would use stale
information and pass on cookies meant for the first host in the second
request. Leak them.
References
| Link | Resource |
|---|---|
| https://curl.se/docs/CVE-2026-6276.html | Patch Vendor Advisory |
| https://curl.se/docs/CVE-2026-6276.json | Product |
| https://hackerone.com/reports/3671818 | Exploit Issue Tracking Third Party Advisory |
| http://www.openwall.com/lists/oss-security/2026/04/29/13 | Mailing List Third Party Advisory |
| https://hackerone.com/reports/3671818 | Exploit Issue Tracking Third Party Advisory |
Configurations
History
14 May 2026, 14:21
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-319 | |
| CPE | cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:* | |
| First Time |
Haxx
Haxx curl |
|
| References | () https://curl.se/docs/CVE-2026-6276.html - Patch, Vendor Advisory | |
| References | () https://curl.se/docs/CVE-2026-6276.json - Product | |
| References | () https://hackerone.com/reports/3671818 - Exploit, Issue Tracking, Third Party Advisory | |
| References | () http://www.openwall.com/lists/oss-security/2026/04/29/13 - Mailing List, Third Party Advisory |
13 May 2026, 18:16
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.5 |
| References | () https://hackerone.com/reports/3671818 - |
13 May 2026, 14:50
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-13 13:01
Updated : 2026-05-14 14:21
NVD link : CVE-2026-6276
Mitre link : CVE-2026-6276
CVE.ORG link : CVE-2026-6276
JSON object : View
Products Affected
haxx
- curl
CWE
CWE-319
Cleartext Transmission of Sensitive Information