CVE-2026-55428
Coder: Route hijacking through lack of validation of agent-supplied AllowedIPs in tailnet coordinator in github.com/coder/coder
8.2
HIGH
CVSS 3.1
EPSS 0.40%
Description
Coder: Route hijacking through lack of validation of agent-supplied AllowedIPs in tailnet coordinator in github.com/coder/coder
How to fix CVE-2026-55428
To remediate CVE-2026-55428, upgrade the affected package to a fixed version below.
- Go/github.com/coder/coder—no fix listed
- —upgrade to 2.34.2 or later
- —upgrade to 2.29.17 or later
Is CVE-2026-55428 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (3)
- from 0
- >= 2.34.0, < 2.34.2
- from 0, < 2.29.17, >= 2.30.0, < 2.32.7, >= 2.33.0, < 2.33.8, >= 2.34.0, < 2.34.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.2 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N |