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CVE-2026-28389 is a NULL pointer dereference vulnerability in OpenSSL's handling of CMS EnvelopedData messages that use KeyAgreeRecipientInfo. During CMS_decrypt() processing, the implementation examines the optional parameters field of the KeyEncryptionAlgorithmIdentifier without first verifying that the field is present. If an attacker supplies a crafted CMS message in which that field is absent, the code can dereference a NULL pointer and terminate the process. The issue affects applications and services that decrypt attacker-controlled CMS content, including S/MIME and other CMS-based protocols. The vulnerable code is outside the OpenSSL FIPS module boundary, and the FIPS modules in the affected supported branches are not impacted.
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What an attacker gets, and what they’ve been doing with it.
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No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
16 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 KeyAgreeRecipientInfo processing in OpenSSL.
A NULL pointer dereference in CMS KeyAgreeRecipientInfo processing that can crash applications handling malformed CMS/S/MIME content.
Possible NULL dereference when processing CMS KeyAgreeRecipientInfo in OpenSSL.
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.