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CVE-2026-22866

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 expon
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:b037fdda2d2b129c888d2ded7d2d4e8793ba9ece5056fa720d31d1fea42c93f1
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"ens-contracts","vendor":"ensdomains","versions":[{"status":"affected","version":"<= 1.6.2"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3b4b0ce9c1f60058a57cee2e14cec24a3156b5b4a26322ff4205440baa4384e8 · sha256:469d646d580e8b33… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":2.7,"baseSeverity":"LOW","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:3b4b0ce9c1f60058a57cee2e14cec24a3156b5b4a26322ff4205440baa4384e8 · sha256:469d646d580e8b33… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-347","description":"CWE-347: Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3b4b0ce9c1f60058a57cee2e14cec24a3156b5b4a26322ff4205440baa4384e8 · sha256:469d646d580e8b33… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/ensdomains/ens-contracts-bug-62248-pr-509","tags":["x_refsource_MISC"],"url":"https://github.com/ensdomains/ens-contracts-bug-62248-pr-509"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3b4b0ce9c1f60058a57cee2e14cec24a3156b5b4a26322ff4205440baa4384e8 · sha256:469d646d580e8b33… · /containers/cna/references/2
{"name":"https://github.com/ensdomains/ens-contracts/commit/c76c5ad0dc9de1c966443bd946fafc6351f87587","tags":["x_refsource_MISC"],"url":"https://github.com/ensdomains/ens-contracts/commit/c76c5ad0dc9de1c966443bd946fafc6351f87587"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3b4b0ce9c1f60058a57cee2e14cec24a3156b5b4a26322ff4205440baa4384e8 · sha256:469d646d580e8b33… · /containers/cna/references/1
{"name":"https://github.com/ensdomains/ens-contracts/security/advisories/GHSA-c6rr-7pmc-73wc","tags":["x_refsource_CONFIRM"],"url":"https://github.com/ensdomains/ens-contracts/security/advisories/GHSA-c6rr-7pmc-73wc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3b4b0ce9c1f60058a57cee2e14cec24a3156b5b4a26322ff4205440baa4384e8 · sha256:469d646d580e8b33… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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