CVEvulnerability
CVE-2026-6276
7.5 HIGH
Official page ↗
- Status
- Modified
- Published
- 2026-05-13
- Last modified
- 2026-09-15
- Assigner
- 2499f714-1537-4658-8207-48ae4bb9eae9
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-319, CWE-346
Description
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.
Affected configurations
• haxx curl (>= 7.71.0 < 8.20.0)
Related
References
- 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