CVE-2026-42258
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 risk0.78% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 53% of all EPSS-scored CVEs.
Advisory coverage (6)
- high[NEW] [high] Ruby: Multiple vulnerabilitiescert-bund · 2026-08-17
- high[UPDATE] [high] HCL BigFix Compliance (Ruby): Multiple vulnerabilitiescert-bund · 2026-08-17
- medium[UPDATE] [medium] Red Hat Enterprise Linux (ruby: net-imap): Multiple vulnerabilitiescert-bund · 2026-08-11
- unknownMultiple vulnerabilities in IBM products (July 31, 2026)cert-fr-avis · 2026-07-31
- unknownUSN-8556-1: Ruby vulnerabilitiesubuntu · 2026-07-16
- mediumGHSA-75xq-5h9v-w6px: net-imap vulnerable to command Injection via unvalidated Symbol inputsghsa · 2026-05-04
External references
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[](https://www.csirts.com/cve/CVE-2026-42258)