Is this vulnerability remotely exploitable?

Yes, in principle. An attacker who can communicate with a Geth node over the P2P network and repeatedly trigger ECIES operations may be able to infer partial information about the node key from observable behavior.

What level of access does an attacker need?

The attacker typically needs network-level access to act as or connect to the node as a P2P peer. Direct file or host access is not required for the information leak itself, but the attacker must be able to exercise and observe ECIES-based interactions.

What is the safest general fix pattern for developers?

The general fix pattern is to treat all cryptographic operations as sensitive and ensure constant, uniform behavior regardless of input validity or secret values. This includes normalizing error handling, avoiding secret-dependent branching that impacts observable outputs, and thoroughly reviewing ECIES and related crypto for side-channel leakage.

Severity:

HIGH RISK

(7.5)

Side-Channel Information Exposure (CWE-203) in Geth ECIES P2P Node Key Handling

CVE-2026-26315

Published:

Feb 19, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Side-Channel / Information Exposure through Observable Behavior

CWE:

CWE-203

Impact:

Partial Node Key Disclosure and P2P Identity Weakening

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Side-Channel / Information Exposure through Observable Behavior

CWE:

CWE-203

Impact:

Partial Node Key Disclosure and P2P Identity Weakening

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Side-Channel Information Exposure (CWE-203) in Geth ECIES P2P Node Key Handling

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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