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CVE-2026-42766 is a NULL pointer dereference in OpenSSL's password-based CMS decryption implementation. The PasswordRecipientInfo.keyDerivationAlgorithm field is optional under the ASN.1 specification, but the implementation dereferences it without checking whether it is present. Processing a specially crafted password-encrypted CMS message that omits this field can crash the application and cause denial of service. OpenSSL FIPS modules in versions 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected because the vulnerable code is outside the FIPS module boundary.
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OpenSSL password-based CMS decryption dereferences the optional PasswordRecipientInfo.keyDerivationAlgorithm field without checking whether it exists. An attacker supplying a message with the field omitted can crash a processing application, causing denial of service. The listed FIPS modules are unaffected.
OpenSSL password-based CMS decryption dereferences the optional PasswordRecipientInfo.keyDerivationAlgorithm field without checking its presence. An attacker-supplied message omitting this field can crash the application and cause denial of service. FIPS modules are unaffected.
A vulnerability referenced by a CentOS local security-check plugin; no technical flaw details are provided.
A vulnerability referenced by the TuxCare CentOS 8.5 security advisory; no technical flaw details are provided.
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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.
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