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CVE-2026-42766 is a NULL pointer dereference vulnerability in OpenSSL's handling of password-based CMS decryption. A specially crafted password-encrypted CMS message can omit the optional PasswordRecipientInfo.keyDerivationAlgorithm field, which is permitted by the ASN.1 specification. During CMS decryption, the vulnerable OpenSSL code dereferences this field without first verifying that it is present. When an application processes such malformed CMS input using password-based CMS decryption, the dereference of the absent field causes a crash. The issue affects OpenSSL 4.0.0 before 4.0.1, 3.6.0 before 3.6.3, 3.5.0 before 3.5.7, 3.4.0 before 3.4.6, 3.0.0 before 3.0.21, 1.1.1 before 1.1.1zh, and 1.0.2 before 1.0.2zq. The affected code is outside the OpenSSL FIPS module boundary, so the FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected.
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24 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 NULL pointer dereference in password-based CMS decryption caused by dereferencing an optional absent keyDerivationAlgorithm field, leading to denial of service.
A security vulnerability in OpenSSL fixed by updating OpenSSL to version 3.5.7; no further details are provided in the content.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.