CVE-2026-63089 WireGuard Easy Weak Token Generation Information Disclosure via OTL Route
Weak token generation allows attackers to brute-force one-time links and steal WireGuard peer credentials, enabling VPN impersonation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-63089?
CVE-2026-63089 is a critical vulnerability in wg-easy, published on 16 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
WireGuard Easy through 15.3.0, fixed in commit 66b292b, contains a cryptographically weak one-time link token generation vulnerability that allows unauthenticated network attackers to recover WireGuard peer credentials by brute-forcing a keyspace of at most 1000 candidate tokens per client ID, as the token is computed using CRC32 over a random value constrained to 0-999. Attackers can enumerate candidate tokens against the unauthenticated /cnf/:oneTimeLink route, which lacks rate limiting and does not validate token expiration, to obtain a peer's PrivateKey and PresharedKey and impersonate that peer on the VPN network.
Which versions are affected by CVE-2026-63089?
How do I fix CVE-2026-63089?
No fix has been published for CVE-2026-63089 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-63089 being exploited?
There is no known exploitation of CVE-2026-63089 in the wild and no public exploit code.
Sources
Also known as GHSA-m894-wgpg-hwpv.