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CVE-2026-9636 is a certificate validation flaw affecting Rockwell Automation CompactLogix 5380, ControlLogix 5580, GuardLogix 5580, Compact GuardLogix 5380, and 1756-EN4TR devices in versions 36 through 37. The vulnerability is in CIP Security certificate revocation handling: the controller does not properly reject certificates that chain through an intermediate certificate revoked via a Certificate Revocation List. As a result, a certificate path that should be considered untrusted may still be accepted during connection establishment, weakening the intended trust enforcement of CIP Security.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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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.
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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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.