CVE-2026-55428
Authenticated agent can inject AllowedIPs into WireGuard peers enabling traffic interception.
Is CVE-2026-55428 being exploited?
Not confirmed. CVE-2026-55428 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.40% probability of exploitation in the next 30 days.
How severe is CVE-2026-55428?
CVE-2026-55428 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-55428?
Yes. A fix has been recorded for CVE-2026-55428. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-55428 affect?
CVE-2026-55428 affects Coder tailnet coordinator, Coder versions <2.29.7, <2.32.7, <2.33.8, <2.34.2, WireGuard peer configurations. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-55428?
Upgrade coordinator to 2.29.7/2.32.7/2.33.8/2.34.2 and monitor coordinator logs for unexpected AllowedIPs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated/compromised agent can advertise arbitrary AllowedIPs; peers install them, enabling traffic interception, hijack, or lateral movement across tunnels.
Immediate action required
- affected>= 2.34.0 and < 2.34.2
- affected>= 2.33.0 and < 2.33.8
- affected>= 2.30.0 and < 2.32.7
- affected< 2.29.17
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.