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CVE-2026-45447 is a heap use-after-free vulnerability in OpenSSL's PKCS7_verify() function. When an application processes a specially crafted PKCS#7 or S/MIME signed message using the OpenSSL PKCS#7 APIs, a SignedData structure containing an empty digestAlgorithms ASN.1 SET can cause OpenSSL to incorrectly free a caller-owned BIO during signature verification. If the application subsequently reuses that BIO or frees it again, the process enters a use-after-free state. The flaw affects PKCS#7 verification paths, including S/MIME signed-message handling built on those APIs. CMS-based processing is not affected, and the vulnerable code is outside the OpenSSL FIPS module boundary.
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No valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.
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57 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 critical OpenSSL heap use-after-free vulnerability in PKCS7_verify that can lead to memory corruption and possible remote code execution when verifying specially crafted PKCS7 or S/MIME signed messages.
A critical heap-based use-after-free/memory corruption vulnerability in OpenSSL PKCS#7/S/MIME signature verification routines that may lead to remote code execution or server disruption when crafted signed messages are processed.
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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.