HIGHCVE-2026-6276Published Modified CNA curl
CVE-2026-6276: stale custom cookie host causes cookie leak
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.
Metrics
- CVSS v3.1
- 7.5
- Severity
- HIGH
- Fixed in
- —
- Affected Products
- 1
Affected packages
- curl / curl≤ 8.19.0 · ≤ 8.18.0 · ≤ 8.17.0 · ≤ 8.16.0 · ≤ 8.15.0 · ≤ 8.14.1
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H