CVE-2026-8927
9.1
CRITICAL
CVSS 3.1
EPSS 0.75%
Description
When reusing a libcurl handle for sequential transfers driven by environment-variable proxy configuration, libcurl fails to clear the proxy authentication state between requests. Specifically, if the initial transfer authenticates against `proxyA` using Digest auth, a subsequent transfer routed through `proxyB` erroneously leaks the `Proxy-Authorization:` header intended solely for `proxyA`.
How to fix CVE-2026-8927
To remediate CVE-2026-8927, upgrade the affected package to a fixed version below.
- —upgrade to 8.21.0-r0 or later
Is CVE-2026-8927 being exploited?
Low — EPSS is 0.8%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- >= 7.12.0, < 8.21.0-r0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |