-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

0xCERT Security Advisory 0xCERT-2026-0221
============================================================

Advisory-ID:  0xCERT-2026-0221
Severity:     Medium
Published:    2026-02-18T22:36:06.000Z
Updated:      2026-10-08T22:48:26.976Z
Chains:       Ethereum
URL:          https://www.0xcert.com/advisory/0xCERT-2026-0221

Title: Go Ethereum Improperly Validates the ECIES Public Key in RLPx Handshake

Summary
- -------
Go Ethereum Improperly Validates the ECIES Public Key in RLPx Handshake. Through a flaw in the ECIES cryptography implementation, an attacker may be able to extract bits of the p2p node key. The issue is resolved in the v1.16.9 and v1.

Details
- -------
Summary
Through a flaw in the ECIES cryptography implementation, an attacker may be able to extract bits of the p2p node key. The issue is resolved in the v1.16.9 and v1.

Affected
- - github.com/ethereum/go-ethereum (go) <= 1.16.8 — fixed in 1.16.9

Severity
Medium (CVSS 6.9), as rated by the upstream advisory.

Recommended actions
- - Upgrade github.com/ethereum/go-ethereum to 1.16.9 or later

Source & attribution
This 0xCERT advisory summarises GHSA-m6j8-rg6r-7mv8 / CVE-2026-26315 from the GitHub Advisory Database, credited upstream to fengjian: https://github.com/advisories/GHSA-m6j8-rg6r-7mv8. Details may change; refer to the original source for the authoritative record.

References
- ----------
- - https://github.com/advisories/GHSA-m6j8-rg6r-7mv8
- - CVE-2026-26315
- - https://github.com/ethereum/go-ethereum/security/advisories/GHSA-m6j8-rg6r-7mv8
- - https://github.com/ethereum/go-ethereum/pull/33669
- - https://github.com/ethereum/go-ethereum/commit/46bee92f9e64c0a06a12586a5d21cffc49d1ba8e
- - https://github.com/ethereum/go-ethereum/releases/tag/v1.16.9
- - https://nvd.nist.gov/vuln/detail/CVE-2026-26315
- - https://pkg.go.dev/vuln/GO-2026-4511

Verify with the 0xCERT OpenPGP key: https://www.0xcert.com/pgp.asc
Fingerprint: 5F94 3ED1 1E50 CF31 2128  C493 CCC7 D9EC 9415 723D

-----BEGIN PGP SIGNATURE-----

wrsEARYKAG0FgmrIRqoJEDe9Tbcr+ZxrRRQAAAAAABwAIHNhbHRAbm90YXRp
b25zLm9wZW5wZ3Bqcy5vcmeG9o0V7eVnjGWLz1bV6w5Bm57sKCgci5tR4E+q
54THdxYhBGCkkFZbJcT5QWu27ze9Tbcr+ZxrAAAI5AD/RQ3FWlzv29hqT0ZQ
2k1Bsrl1x3JhVTrQKaJ+LocwSNgA/jyhy+7dVgnnU0GgTfaGMhclKBiJYaNg
ZQa48M82P5kE
=3yLb
-----END PGP SIGNATURE-----