How severe is CVE-2026-26314?

No CVSS score has been assigned to CVE-2026-26314 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-26314?

CVE-2026-26314 affects the following packages: github.com/ethereum/go-ethereum (Go). Ecosystems affected: Go.

How do I fix CVE-2026-26314?

Update github.com/ethereum/go-ethereum to 1.16.9 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-26314 is resolved across your whole dependency graph.

How do I detect CVE-2026-26314 in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/ethereum/go-ethereum, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-26314 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2026-26314 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-26314 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-26314?

CVE-2026-26314 has an EPSS (Exploit Prediction Scoring System) score of 0.7%, placing it in the 52th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-26314?

CVE-2026-26314 is classified as Improper Input Validation (CWE-20). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-26314 published, and has it been updated?

CVE-2026-26314 was published on February 19, 2026 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹 Go

Not in CISA KEV

CVE-2026-26314 — go-ethereum

Fix: ethereum/go-ethereum@895a859

CVE-2026-26314 is a Improper Input Validation vulnerability in github.com/ethereum/go-ethereum. A fix is available for github.com/ethereum/go-ethereum — see the affected versions and patch details below.

Go Ethereum affected by DoS via malicious p2p message

Also known asGHSA-2gjw-fg97-vg3rGO-2026-4507

Published

Feb 19, 2026

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-26314.

EPSS Exploitation Probability

via FIRST.org ↗

0.7%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs52th percentile — riskier than 52% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

🐹github.com/ethereum/go-ethereum

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Impact

A vulnerable node can be forced to shutdown/crash using a specially crafted message. More details to be released later.

Patches

The problem is resolved in the v1.16.9 and v1.17.0 releases of Geth.

Credit

This issue was reported to the Ethereum Foundation Bug Bounty Program by Waleed Ahmed from vulsight.com

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/ethereum/go-ethereum`	all versions	1.16.9`go get github.com/ethereum/go-ethereum@v1.16.9`

Affected Products

1 product · 1 configurations

Application

go ethereumethereum

< 1.16.9

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/ethereum/go-ethereum, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/ethereum/go-ethereum to 1.16.9 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-26314 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### Impact A vulnerable node can be forced to shutdown/crash using a specially crafted message. More details to be released later. ### Patches The problem is resolved in the v1.16.9 and v1.17.0 releases of Geth. ### Credit This issue was reported to the Ethereum Foundation Bug Bounty Program by Waleed Ahmed from vulsight.com

O3 Security · Impact-Aware SCA

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