CVE-2026-13735

Zephyr's WireGuard implementation in subsys/net/lib/wireguard/wgcrypto.c mishandled keepalive packets. In wgprocessdatamessage, any type-4 transport-data message whose payload was exactly 16 bytes an empty plaintext plus a bare Poly1305 tag, i.e. a keepalive was accepted and returned immediately,...

CVE-2026-13734

Zephyr's WireGuard VPN data-plane receive handler wgprocessdatamessage in subsys/net/lib/wireguard/wgcrypto.c validated the anti-replay counter too late. After AEAD decryption of a MESSAGETRANSPORTDATA packet succeeded, the code committed several peer-state changes — updatepeeraddr endpoint roami...

CVE-2026-13735

Zephyr RTOS WireGuard implementation in subsys/net/lib/wireguard/wg_crypto.c accepted 16-byte keepalive data messages before verifying the Poly1305 authentication tag, allowing a network attacker with a valid receiver index to forge keepalive packets without possessing the session key. The impact...

CVE-2026-13735 WireGuard keepalive transport-data messages accepted without Poly1305 authentication

Zephyr's WireGuard implementation in subsys/net/lib/wireguard/wgcrypto.c mishandled keepalive packets. In wgprocessdatamessage, any type-4 transport-data message whose payload was exactly 16 bytes an empty plaintext plus a bare Poly1305 tag, i.e. a keepalive was accepted and returned immediately,...

CVE-2026-13735 WireGuard keepalive transport-data messages accepted without Poly1305 authentication

Zephyr's WireGuard implementation in subsys/net/lib/wireguard/wgcrypto.c mishandled keepalive packets. In wgprocessdatamessage, any type-4 transport-data message whose payload was exactly 16 bytes an empty plaintext plus a bare Poly1305 tag, i.e. a keepalive was accepted and returned immediately,...

CVE-2026-13734 Zephyr WireGuard mutates peer state before anti-replay check, enabling capture-replay endpoint hijack

Zephyr's WireGuard VPN data-plane receive handler wgprocessdatamessage in subsys/net/lib/wireguard/wgcrypto.c validated the anti-replay counter too late. After AEAD decryption of a MESSAGETRANSPORTDATA packet succeeded, the code committed several peer-state changes — updatepeeraddr endpoint roami...

CVE-2026-13734

Zephyr RTOS's WireGuard data-plane receive handler wg_process_data_message() in subsys/net/lib/wireguard/wg_crypto.c validated the anti-replay counter only after committing several peer-state mutations (endpoint roaming update, liveness timers, and keypair rotation). Because the AEAD tag authenti...

CVE-2026-13734 Zephyr WireGuard mutates peer state before anti-replay check, enabling capture-replay endpoint hijack

Zephyr's WireGuard VPN data-plane receive handler wgprocessdatamessage in subsys/net/lib/wireguard/wgcrypto.c validated the anti-replay counter too late. After AEAD decryption of a MESSAGETRANSPORTDATA packet succeeded, the code committed several peer-state changes — updatepeeraddr endpoint roami...

CVE-2026-10665 Heap buffer overflow on WireGuard receive path via unbounded incoming packet length

In Zephyr's WireGuard subsystem subsys/net/lib/wireguard, wgprocessdatamessage in wgcrypto.c linearizes an inbound transport-data payload into a fixed pool buffer of CONFIGWIREGUARDBUFLEN bytes before decryption. The call netbuflinearizebuf-data, datalen, pkt-buffer, ..., datalen passed the...