CVE-2026-26315Public exploitNetwork attack vector

Node-key disclosure via invalid-curve ECIES oracle

Published Feb 19, 2026 · Updated Feb 19, 2026

Information disclosure in go-ethereum before 1.16.9 allows remote attackers to extract bits of the P2P node key through an RLPx handshake. During unauthenticated RLPx ECIES decryption, PrivateKey.GenerateShared accepts an off-curve ephemeral public key and reaches ECDH before MAC verification, exposing a decrypt-success oracle. Network access to the P2P listener is sufficient; repeated crafted handshakes disclose node-key material without modifying node state or interrupting service.

CVSS severity6.9
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in go-ethereum before 1.16.9 allows remote attackers to extract bits of the P2P node key through an RLPx handshake. During unauthenticated RLPx ECIES decryption, PrivateKey.GenerateShared accepts an off-curve ephemeral public key and reaches ECDH before MAC verification, exposing a decrypt-success oracle. Network access to the P2P listener is sufficient; repeated crafted handshakes disclose node-key material without modifying node state or interrupting service.

The record

CVE
CVE-2026-26315
Published
Feb 19, 2026
Updated
Feb 19, 2026
Vendor
Ethereum Foundation
Product
go-ethereum
Classifications
CWE-203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.16.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Ethereum Foundation · go-ethereumversion=< 1.16.9

Published CVSS scores

6.9GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-203Observable Discrepancy

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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