CVE Explorer
CVE-2026-42770
Issue summary: When EVP_PKEY_derive_set_peer() is called with a DHX (X9.42)
peer key, the peer key is not properly checked for the subgroup membership.
Impact summary: A malicious peer which presents an X9.42 key carrying the
victim's p and g parameters, a forged q = r (a small prime factor of the
cofactor (p−1)/q_local), and a public value Y of order r can recover the
victim's private key after a small number of key exchange attempts.
When EVP_PKEY_derive_set_peer() is called with a DHX (X9.4
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0
Affected products and versions
1 source assertion{"defaultStatus":"unaffected","product":"OpenSSL","vendor":"OpenSSL","versions":[{"lessThan":"4.0.1","status":"affected","version":"4.0.0","versionType":"semver"},{"lessThan":"3.6.3","status":"affected","version":"3.6.0","versionType":"semver"},{"lessThan":"3.5.7","status":"affected","version":"3.5.0","versionType":"semver"},{"lessThan":"3.4.6","status":"affected","version":"3.4.0","versionType":"semver"},{"lessThan":"3.0.21","status":"affected","version":"3.0.0","versionType":"semver"}]}
- cve_program_cvelist_v5affectedurn:baitaphish:normalized-source-record:v2:b628091390cac7cb234e47579756b0b7b91378764e1b7a9dd7d19f73cd351600 · sha256:a242caf1a930175e… · /containers/cna/affected/0
Provider-owned CVSS observations
1 source assertion{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.7,"baseSeverity":"LOW","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
- cve_program_cvelist_v5cvssurn:baitaphish:normalized-source-record:v2:b628091390cac7cb234e47579756b0b7b91378764e1b7a9dd7d19f73cd351600 · sha256:a242caf1a930175e… · /containers/adp/0/metrics/0/cvssV3_1
CWE assertions
1 source assertion{"cweId":"CWE-325","description":"CWE-325 Missing Cryptographic Step","lang":"en","type":"CWE"}
- cve_program_cvelist_v5cweurn:baitaphish:normalized-source-record:v2:b628091390cac7cb234e47579756b0b7b91378764e1b7a9dd7d19f73cd351600 · sha256:a242caf1a930175e… · /containers/cna/problemTypes/0/descriptions/0
Source references
6 source assertions{"name":"4.0.1 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/3da5a516cd2635a320ff748503db2cef7c4b0f02"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:b628091390cac7cb234e47579756b0b7b91378764e1b7a9dd7d19f73cd351600 · sha256:a242caf1a930175e… · /containers/cna/references/1
{"name":"3.6.3 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/3ddbb7ab50bd93dfc59cbe08e269a67605aeebdb"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:b628091390cac7cb234e47579756b0b7b91378764e1b7a9dd7d19f73cd351600 · sha256:a242caf1a930175e… · /containers/cna/references/2
{"name":"3.4.6 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/5f452bba2c681423d8fcffd120a19b757ee42e3c"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:b628091390cac7cb234e47579756b0b7b91378764e1b7a9dd7d19f73cd351600 · sha256:a242caf1a930175e… · /containers/cna/references/4
{"name":"3.0.21 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/7fbfde7677ed8808828bf00ff01c937ca04bdda2"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:b628091390cac7cb234e47579756b0b7b91378764e1b7a9dd7d19f73cd351600 · sha256:a242caf1a930175e… · /containers/cna/references/5
{"name":"3.5.7 git commit","tags":["patch"],"url":"https://github.com/openssl/openssl/commit/ca2237ab5615641b662183b077f62c08d75e8070"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:b628091390cac7cb234e47579756b0b7b91378764e1b7a9dd7d19f73cd351600 · sha256:a242caf1a930175e… · /containers/cna/references/3
{"name":"OpenSSL Advisory","tags":["vendor-advisory"],"url":"https://openssl-library.org/news/secadv/20260609.txt"}
- cve_program_cvelist_v5referenceurn:baitaphish:normalized-source-record:v2:b628091390cac7cb234e47579756b0b7b91378764e1b7a9dd7d19f73cd351600 · sha256:a242caf1a930175e… · /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.