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CVE-2026-27565 is a critical OS command injection vulnerability in IODD file processing in affected IO-Link industrial master devices from Pepperl+Fuchs, Phoenix Contact, and Carlo Gavazzi running firmware earlier than 1.7.4. An unauthenticated remote attacker can submit a malicious IODD file that causes embedded shell commands to execute with root privileges. Exploitation can also write a root-privileged shell script to persistent storage, allowing it to remain active after a reboot.
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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.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical unauthenticated OS command-injection flaw (CWE-78) in IODD-file processing that allows remote attackers to upload a malicious IODD file, execute commands as root, and establish reboot-persistent compromise.
A critical unauthenticated remote command-execution vulnerability (CWE-78) in an unspecified affected product. An attacker can upload a malicious IODD file to write and execute a root-privileged shell script that persists across reboot.
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.