CVE-2026-22866: Ethereum Name Service (ENS) is a distributed, open, and extensible naming system based on the Ethereum blockch

Q: How do I fix CVE-2026-22866?

ethereum name service: upgrade to newer than 1.6.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-22866 being exploited?

CVE-2026-22866 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-22866 affect?

CVE-2026-22866 affects ethereum name service. Severity is high (CVSS 7.5). Ethereum Name Service (ENS) is a distributed, open, and extensible naming system based on the Ethereum blockchain. In versions 1.6.2 and prior, the `RSASHA256Algorithm` and `RSASHA1Algorithm` contracts fail to validate PKCS#1 v1.5 padding s

Q: How urgent is CVE-2026-22866?

Priority 34/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 7.5REMOTEUPGRADE

CVE-2026-22866 is a high-severity flaw (CVSS 7.5) affecting ethereum name service. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Ethereum Name Service (ENS) is a distributed, open, and extensible naming system based on the Ethereum blockchain. In versions 1.6.2 and prior, the `RSASHA256Algorithm` and `RSASHA1Algorithm` contracts fail to validate PKCS#1 v1.5 padding structure when verifying RSA signatures. The contracts only check if the last 32 (or 20) bytes of the decrypted signature match the expected hash. This enables Bleichenbacher's 2006 signature forgery attack agai

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-347
Published	2026-02-25
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: ens.domains

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-25 16:23 UTCPublished CVE record published
2026-06-17 10:20 UTCUpdated Record last modified

ens.domains ethereum name service UPGRADE

Affected: <= 1.6.2

Fixed in: newer than 1.6.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ethereum-name-service || rpm -q ethereum-name-service || ethereum-name-service --version

2. UPGRADE to newer than 1.6.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ethereum-name-service

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ethereum-name-service

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-22866?

ethereum name service: upgrade to newer than 1.6.2. Exact commands for each OS are on this page.

Is CVE-2026-22866 being exploited?

CVE-2026-22866 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-22866 affect?

CVE-2026-22866 affects ethereum name service. Severity is high (CVSS 7.5). Ethereum Name Service (ENS) is a distributed, open, and extensible naming system based on the Ethereum blockchain. In versions 1.6.2 and prior, the `RSASHA256Algorithm` and `RSASHA1Algorithm` contracts fail to validate PKCS#1 v1.5 padding s

How urgent is CVE-2026-22866?

Priority 34/100. High severity; Remotely exploitable, no login, no user action

References

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