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CVE-2026-63073 is a format-string vulnerability in OpenSSL CMP response validation. In ossl_cmp_msg_check_update(), OpenSSL converts a peer-controlled sender distinguished name using X509_NAME_oneline() and supplies the resulting string directly as the format argument to ERR_raise_data(). Percent-format directives in the sender DN are consequently interpreted by BIO_vsnprintf() without corresponding variadic arguments. The issue affects OpenSSL 4.0, 3.6, 3.5, and 3.4 CMP clients; OpenSSL 3.0, 1.1.1, and 1.0.2 are not affected. The CMP implementation is outside the OpenSSL FIPS module boundary.
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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.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Low-severity externally controlled format-string flaw in OpenSSL CMP response validation that can let a malicious CMP endpoint crash a client.
A vulnerability addressed by the referenced FreeBSD OpenSSL package security update; no technical flaw details are provided.
An OpenSSL vulnerability addressed by Debian DSA-6465-1; the advisory characterizes the grouped issues as potentially causing denial of service.
A critical, remotely exploitable vulnerability with low attack complexity and no required privileges or user interaction, affecting listed Debian Linux and Red Hat Enterprise Linux packages including OpenSSL and EDK2 components.
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.