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CVE-2026-63072 is an out-of-bounds heap write in OpenSSL CMS key unwrapping. The CMS key-unwrapping code sizes its output buffer from the unwrapped-key length reported by the cipher operation. The AES-WRAP-PAD unwrap primitive can, on an integrity-failure path, write and cleanse more bytes than that reported length. In the affected cms_kek_cipher path, this results in a deterministic eight-byte zero write immediately beyond the heap allocation during CMS_decrypt(). CMS accepts both padded and unpadded AES key-wrap algorithms, permitting an attacker to modify a key-wrap algorithm identifier in an otherwise legitimate CMS message to select AES-WRAP-PAD. The RFC 5649 integrity check subsequently fails, but the overflow occurs before failed unwrap processing completes.
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No public exploit code observed for this vulnerability.
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16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Moderate-severity heap buffer overflow/out-of-bounds write in OpenSSL CMS key unwrapping. A modified key-wrap algorithm identifier in an otherwise legitimate encrypted CMS message can cause heap corruption and denial of service.
An OpenSSL CMS decryption heap-overflow vulnerability. A crafted CMS message can invoke a deterministic 8-byte zero-value out-of-bounds heap write through CMS_decrypt(), typically causing denial of service.
An OpenSSL vulnerability addressed by Debian DSA-6465-1; the advisory characterizes the grouped issues as potentially causing denial of service.
A crafted CMS message can trigger a deterministic fixed-size, zero-value, 8-byte heap overflow through OpenSSL CMS_decrypt(). The stated consequence is heap corruption and denial of service rather than code execution.
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.