OpenSSL CMS KeyTransportRecipientInfo NULL Pointer Dereference
CVE-2026-28390 is a NULL pointer dereference in OpenSSL during processing of crafted CMS EnvelopedData messages that use KeyTransportRecipientInfo with RSA-OAEP encryption. When OpenSSL processes such input via CMS_decrypt(), it examines the optional parameters field of the RSA-OAEP SourceFunc algorithm identifier without first verifying that the field is present. If the parameters field is omitted, the code can dereference a NULL pointer and crash. The issue affects applications and services that decrypt attacker-controlled CMS data, including S/MIME processing and other CMS-based protocols. The OpenSSL advisory indicates the vulnerable code is outside the OpenSSL FIPS module boundary, and the FIPS modules in 3.6, 3.5, 3.4, 3.3, and 3.0 are not affected.
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Impact
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Mitigation
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Remediation
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Exploits
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No public exploit code observed for this vulnerability.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
22 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A specific vulnerability in OpenSSL addressed in Alpine Linux stable releases 3.20.10, 3.21.7, 3.22.4, and 3.23.4.
A NULL dereference bug in CMS KeyTransportRecipientInfo processing in OpenSSL.
A NULL pointer dereference in CMS KeyTransportRecipientInfo processing that can cause denial of service in applications parsing malformed CMS/S/MIME messages.
Possible NULL dereference when processing CMS KeyTransportRecipientInfo in OpenSSL.
The version that knows your environment.
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.