CVE-2026-6276
7.5
HIGH
CVSS 3.1
EPSS 0.29%
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.
How to fix CVE-2026-6276
To remediate CVE-2026-6276, upgrade the affected package to a fixed version below.
- Alpine/curl—upgrade to 8.20.0-r0 or later
Is CVE-2026-6276 being exploited?
Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 7.71.0, < 8.20.0-r0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |