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CVE-2026-67278 is an improper cryptographic signature verification vulnerability in MikroTik RouterOS 7.x. RouterOS accepts malformed RSA/PKCS#1 v1.5 signatures during X.509 certificate validation. The permissive validation affects RSA-based services, including TLS/X.509 validation and RSA-based SSH host-key authentication. RouterOS includes an RSA root CA using public exponent 3; this permits construction of a trusted intermediate certificate using the root public certificate without possession of the root private key when signature validation is bypassed. Releases 7.23.4 and 7.24.2 contained an incomplete fix.
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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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remotely exploitable, low-complexity MikroTik RouterOS vulnerability requiring no privileges or user interaction, with high confidentiality and integrity impact and no availability impact according to the provided CVSS v3 vector.
A RouterOS vulnerability that enables TLS server impersonation.
RouterOS X.509 certificate-handling vulnerability that permits forging trusted TLS certificates.
One of several vulnerabilities in MikroTik RouterOS. The vulnerabilities are reported as actively exploited; a combination of two enables complete device compromise over SSH.
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.