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VulnerabilityPublished

CVE-2026-55107: elct9620 kobako · Code Injection

Affects elct9620 kobakoSource CVE Database V5

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Not known to be exploited · CVSS 10.0 Critical : upgrade to 0.9.1 as a priority.

Data as of 14 Nov 2026, 20:44 UTC

CVSS 3.1 base score
10.0Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.7% chance of exploitation in 30 days – higher than 57% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 30 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 14 Nov 2026.

What to do

Upgrade elct9620 kobako to 0.9.1.

Affected software

ProductAffectedFixed in
elct9620kobakoAffected
  • >=0.1.0 <0.9.1
Fixed in
  • 0.9.1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade Kobako to version 0.9.1 or later, where this vulnerability has been patched. No other mitigation is necessary as the fix fully addresses the issue.

Description

Kobako is a Ruby gem embedding a Wasm-isolated mruby interpreter to safely execute untrusted Ruby scripts. Versions from 0.1.0 up to but not including 0.9.1 contain a vulnerability allowing guest scripts to escape the sandbox and execute arbitrary Ruby code in the host process. This vulnerability is identified as CVE-2026-55107 and has been patched in version 0.9.1.

References

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