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A cryptographic validation flaw in OpenSSL affects DHX (X9.42) finite-field Diffie-Hellman peer key handling in EVP_PKEY_derive_set_peer(). When validating a DHX peer key, OpenSSL performs the subgroup membership check Y^q mod p using the peer-supplied q parameter instead of the local key's q, and later matches domain parameters without comparing q. An attacker can therefore present a malicious X9.42 peer key that reuses the victim's p and g parameters, substitutes a forged small-prime q value, and supplies a public value Y of corresponding small order. This causes the derived shared secret to be confined to a small subgroup, leaking the victim private key modulo that small factor. By repeating the exchange across small-prime factors of the cofactor and combining the results with the Chinese Remainder Theorem, an attacker can recover the full private key. This is a Lim-Lee style small-subgroup-confinement attack. The issue has a narrow practical exposure and primarily affects deployments using static DHX keys, especially CMP environments with long-lived RA or CA keys and bespoke interactive applications using X9.42 DHX.
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16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An OpenSSL vulnerability addressed in Alpine Linux 3.22.5 and 3.23.5 as part of the June 9, 2026 OpenSSL advisory.
An OpenSSL vulnerability addressed in Alpine Linux 3.24.1 as part of the June 9, 2026 advisory.
A low-severity OpenSSL DHX peer validation flaw where subgroup membership checks use attacker-supplied q, enabling small-subgroup confinement attacks and possible private key recovery in narrow scenarios.
A security vulnerability in OpenSSL fixed by updating OpenSSL to version 3.5.7; no further details are provided in the content.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.