SB2026042740 - Multiple vulnerabilities in go-ethereum

Description

This security bulletin contains information about 2 vulnerabilities.

1) Insufficient verification of data authenticity (CVE-ID: CVE-2026-26315)

CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to improper public key validation in the ECIES cryptography implementation in the RLPx handshake when processing handshake data. A remote attacker can send a specially crafted handshake to disclose sensitive information.

The issue may allow extraction of bits of the p2p node key.

2) Input validation error (CVE-ID: CVE-2026-26314)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper input validation in the p2p message handling component when processing p2p messages. A remote attacker can send a specially crafted message to cause a denial of service.

Remediation

Install update from vendor's website.

References

• https://github.com/ethereum/go-ethereum/security/advisories/GHSA-m6j8-rg6r-7mv8
• https://github.com/ethereum/go-ethereum/security/advisories/GHSA-2gjw-fg97-vg3r
• https://github.com/advisories/GHSA-2gjw-fg97-vg3r