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.
INFO
Published Date :
2026-02-25T15:47:16.230Z
Last Modified :
2026-02-25T20:34:05.144Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-22866 vulnerability.
| Vendors | Products |
|---|---|
| Ens.domains |
|
| Ensdomains |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-22866.
