CVE-2026-11856
9.8
CRITICAL
CVSS 3.1
EPSS 1.1%
Description
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`.
How to fix CVE-2026-11856
To remediate CVE-2026-11856, upgrade the affected package to a fixed version below.
- Alpine/curl—upgrade to 8.21.0-r0 or later
Is CVE-2026-11856 being exploited?
Low — EPSS is 1.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 7.10.6, < 8.21.0-r0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |