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CVE-2026-55107 is a sandbox escape vulnerability in the Kobako Ruby gem affecting versions 0.1.0 through 0.9.0. A guest mruby script executing inside the Kobako sandbox can abuse dispatcher behavior involving method_missing and public_send on bound Service objects to execute arbitrary Ruby in the host process. The flaw breaks the intended isolation boundary between untrusted mruby code and the embedding Ruby runtime, allowing attacker-controlled sandboxed code to invoke host-side functionality that should not be reachable from the sandbox.
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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.
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 and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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.