CVE-2026-4395
Heap-based buffer overflow in wc_ecc_import_x963_ex KCAPI path
Summary
Heap-based buffer overflow in wc_ecc_import_x963_ex KCAPI path
Original description
The description as published by the source.
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.
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-4395 wolfssl
- Ubuntu UBUNTU-CVE-2026-4395 wolfssl
References
- advisory github.com
- advisory nvd.nist.gov
- package github.com
- patch github.com