Cloudanix VulnDB

CVE-2026-4395

Critical · 9.8

CVSS

9.8

EPSS

0.6%

Published

Mar 19, 2026

CISA due date

—

The record

Heap-based buffer overflow in the KCAPI ECC code path of wc_ecc_import_x963_ex() in wolfSSL wolfcrypt allows a remote attacker to write attacker-controlled data past the bounds of the pubkey_raw buffer via a crafted oversized EC public key point. The WOLFSSL_KCAPI_ECC code path copies the input to key->pubkey_raw (132 bytes) using XMEMCPY without a bounds check, unlike the ATECC code path which includes a length validation. This can be triggered during TLS key exchange when a malicious peer sends a crafted ECPoint in ServerKeyExchange.

Affected packages

Ecosystem Package Introduced Fixed

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