6.9

CVSS Score

4.0

-

CVSS Score

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CVE-2026-26315

CVE-2026-26315: Go Ethereum Improperly Validates the ECIES Public Key in RLPx Handshake

Impact

Through a flaw in the ECIES cryptography implementation, an attacker may be able to extract bits of the p2p node key.

Patches

The issue is resolved in the v1.16.9 and v1.17.0 releases of Geth. We recommend rotating the node key after applying the upgrade, which can be done by removing the file <datadir>/geth/nodekey before starting Geth.

Credit

The issue was reported as a public pull request to go-ethereum by @fengjian.

(GitHub Advisory)

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CVE-2026-26315

CVE-2026-26315:

6.9

CVSS Score

4.0

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
github.com/ethereum/go-ethereum	go	<= 1.16.8	1.16.9

Technical Details

Vulnerability Intelligence
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Root Cause Analysis

The analysis of the security advisory and the associated commit 46bee92f9e64c0a06a12586a5d21cffc49d1ba8e points directly to a vulnerability in the ECIES (Elliptic Curve Integrated Encryption Scheme) implementation in go-ethereum. The commit message explicitly states that the fix is for an 'ECIES invalid-curve handling' issue in the RLPx handshake. The core of the vulnerability is the lack of public key validation before performing the ECDH operation.

The patch applied to crypto/ecies/ecies.go adds a crucial check within the ecies.PrivateKey.GenerateShared function. The added lines if pub.X == nil || pub.Y == nil || !pub.Curve.IsOnCurve(pub.X, pub.Y) ensure that the public key is a valid point on the curve before any cryptographic operations are performed with it. Without this check, the function was susceptible to an invalid-curve attack. The commit message confirms that this allowed for an oracle attack, where an attacker could discern information about the node's private key based on the different error responses for valid and invalid keys. Therefore, ecies.PrivateKey.GenerateShared is the primary vulnerable function, as it's the one that improperly processes the malicious input (the invalid public key).

Vulnerable functions

ecies.PrivateKey.GenerateShared

crypto/ecies/ecies.go

The vulnerability lies in the `GenerateShared` function within the `ecies` package. Prior to the patch, this function did not validate whether the provided public key (`pub`) was a valid point on the elliptic curve. An attacker could provide a specially crafted invalid public key. The function would proceed with the Elliptic Curve Diffie-Hellman (ECDH) key exchange, and the failure would only be detected later during the MAC verification, resulting in a different error message (`ErrInvalidMessage`). This difference in error handling created an oracle, allowing an attacker to distinguish between valid and invalid points, and over time, extract bits of the private node key through a timing or side-channel attack.

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WAF Protection Rules

WAF Rule

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Reasoning

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6.9

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Concerned about an active attack path?

CVE-2026-26315: Go Ethereum Improperly Validates the ECIES Public Key in RLPx Handshake

Impact

Patches

Credit

CVE-2026-26315:

6.9

-

Basic Information

Basic Information

Is this CVE running in your environment?

Technical Details

Technical Details

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

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WAF Protection Rules

WAF Rule

Reasoning

CVE-2026-26315: Go Ethereum Improperly Validates the ECIES Public Key in RLPx Handshake

Impact

Patches

Credit

Technical Details

6.9

6.9

Vulnerability IntelligenceMiggo AI

Root Cause Analysis

Vulnerable functions

Basic Information

Basic Information

Vulnerability Intelligence
Miggo AI

Vulnerability Intelligence
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