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CVE-2026-63074 is an unbounded resource-allocation vulnerability in OpenSSL Certificate Management Protocol (CMP) processing. When a CMP server receives a message containing additional certificates and rejects that message, the certificates added from the message remain in the OSSL_CMP_CTX untrusted-certificate stack. A server that reuses a long-lived OSSL_CMP_CTX consequently retains these certificates rather than removing them. Repeated rejected requests containing distinct additional certificates can cause the cache to grow without bound.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Low-severity unbounded-memory-growth flaw in OpenSSL CMP. A malicious client can cause extraCerts to accumulate in a long-lived server context, resulting in memory exhaustion.
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.
An OpenSSL-related vulnerability referenced by CVE ID only; the content provides no technical details.
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.