CVE-2026-42256
An attacker can exploit multiple vulnerabilities in Ruby to disclose information, carry out a Denial of Service attack, and execute arbitrary code.
CSIRTS triage
- What
- Multiple vulnerabilities can be exploited to disclose information, carry out a Denial of Service attack, and execute arbitrary code.
- Who is affected
- Users of Ruby are affected.
- Urgency
- Remediation is high urgency due to the severity of the vulnerabilities.
- Action
- Update Ruby to the latest version as soon as possible.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 23% of all EPSS-scored CVEs.
Advisory coverage (2)
- high[NEW] [high] Ruby: Multiple vulnerabilitiescert-bund · 2026-08-17
- high[UPDATE] [high] HCL BigFix Compliance (Ruby): Multiple vulnerabilitiescert-bund · 2026-08-17
External references
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[](https://www.csirts.com/cve/CVE-2026-42256)