CVE-2026-27017
Fingerprint vulnerability in uTLS from GREASE ECH mismatch for Chrome parrots in github.com/refraction-networking/utls
EPSS 0.01%
Description
Fingerprint vulnerability in uTLS from GREASE ECH mismatch for Chrome parrots in github.com/refraction-networking/utls
How to fix CVE-2026-27017
To remediate CVE-2026-27017, upgrade the affected package to a fixed version below.
- Go/github.com/refraction-networking/utls—upgrade to 1.8.1 or later
- Go/github.com/refraction-networking/utls—upgrade to 1.8.1 or later
Is CVE-2026-27017 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 1.6.0, < 1.8.1
- >= 1.6.0, < 1.8.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N |