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CVE-2026-22866— ENS DNSSEC Oracle Vulnerable to RSA Signature Forgery via Missing PKCS#1 v1.5 Padding Validation

Quick assessment

Affected
ensdomains ens-contracts
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ENS是Ethereum Name Service开源的以太坊域名服务的注册商和本地解析器的实现。 ENS 1.6.2及之前版本存在数据伪造问题漏洞，该漏洞源于验证RSA签名时未验证PKCS#1 v1.5填充结构，可能导致签名伪造攻击。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-22866

Vulnerability Information
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Vulnerability Title
ENS DNSSEC Oracle Vulnerable to RSA Signature Forgery via Missing PKCS#1 v1.5 Padding Validation
Source: CVE Program / CVE List V5
Vulnerability Description
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 against DNS zones using RSA keys with low public exponents (e=3). Two ENS-supported TLDs (.cc and .name) use e=3 for their Key Signing Keys, allowing any domain under these TLDs to be fraudulently claimed on ENS without DNS ownership. Apatch was merged at commit c76c5ad0dc9de1c966443bd946fafc6351f87587. Possible workarounds include deploying the patched contracts and pointing DNSSECImpl.setAlgorithm to the deployed contract.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
ENS 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ENS是Ethereum Name Service开源的以太坊域名服务的注册商和本地解析器的实现。 ENS 1.6.2及之前版本存在数据伪造问题漏洞，该漏洞源于验证RSA签名时未验证PKCS#1 v1.5填充结构，可能导致签名伪造攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ensdomains ens-contracts <= 1.6.2 -

II. Public POCs for CVE-2026-22866

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III. Intelligence Information for CVE-2026-22866

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Vendor Advisories for CVE-2026-22866 (1)

IV. Related Vulnerabilities

Same product: ens-contracts
Same vendor: ensdomains
Same weakness: CWE-347

V. Comments for CVE-2026-22866

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