CVE-2026-79977 WireGuard - Denial of Service & Traffic Redirection

WireGuard VPN in subsys/net/lib/wireguard/wg.c contains an endpoint spoofing vulnerability caused by unauthenticated transport-data messages updating peer endpoints, letting attackers redirect traffic and cause denial of service, exploit requires sending spoofed UDP datagrams to port 51820.

CVSS base score 8.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.24% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Published
23 October 2026
Updated
25 October 2026
Weakness
CWE-306

Vendor fix

Update to the latest WireGuard version with the fix that removes endpoint learning from unauthenticated messages.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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