[NEW] [high] Ruby: Multiple vulnerabilities
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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Details
Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2379
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Moderate exploitation riskCVE-2026-413161.1% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 63% of all scored CVEs.
- Low exploitation riskCVE-2026-422450.41% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 34% of all scored CVEs.
- Low exploitation riskCVE-2026-422460.31% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all scored CVEs.
- Low exploitation riskCVE-2026-422560.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 22% of all scored CVEs.
- Low exploitation riskCVE-2026-422570.43% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 35% of all scored CVEs.
- Low exploitation riskCVE-2026-422580.78% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 52% of all scored CVEs.
- Low exploitation riskCVE-2026-472400.49% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 40% of all scored CVEs.
- Low exploitation riskCVE-2026-472410.24% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 15% of all scored CVEs.
- Low exploitation riskCVE-2026-472420.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-41316 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-42245 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-42246 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-42256 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-42257 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-42258 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-47240 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-47241 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-47242 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownMultiples vulnérabilités dans les produits IBM (31 juillet 2026)cert-fr-avis
- high[UPDATE] [high] Ruby and Ruby on Rails (erb gem): Vulnerability allows code executioncert-bund
- unknownUSN-8556-1: Ruby vulnerabilitiesubuntu
- medium[UPDATE] [medium] Red Hat Enterprise Linux (ruby: net-imap): Multiple vulnerabilitiescert-bund
- high[UPDATE] [high] HCL BigFix Compliance (Ruby): Multiple vulnerabilitiescert-bund
- mediumGHSA-46q3-7gv7-qmgg: Net::IMAP: Command Injection via ID command argumentghsa
- lowGHSA-c4fp-cxrr-mj66: Net::IMAP: Denial of Service via incomplete raw argument validationghsa
- mediumGHSA-8p34-64r3-mwg8: Net::IMAP: Command Injection via non-synchronizing literal in "raw" argumentghsa
- unknownCVE-2026-47241: Net::IMAP: Denial of Service via incomplete raw argument validationmsrc
- unknownCVE-2026-47242: Net::IMAP: Command Injection via ID command argumentmsrc
- unknownCVE-2026-47240: Net::IMAP: Command Injection via non-synchronizing literal in "raw" argumentmsrc
- mediumGHSA-75xq-5h9v-w6px: net-imap vulnerable to command Injection via unvalidated Symbol inputsghsa
Recent advisories for Ruby
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- highCVE-2026-53510: Savon is a Ruby SOAP client. From 0.9.8 until 2.17.2, Savon::Model .all_operations interpolate…nvd · 2026-07-31
- high[NEW] [high] Ruby on Rails: Vulnerability allows information disclosurecert-bund · 2026-07-31
- unknownCVE-2026-54522: MessagePack for Ruby is an implementation of the MessagePack binary serialization format. Prio…nvd · 2026-07-30
- highGHSA-5p9g-j988-pcwv: MCP Ruby SDK: Ruby SSE Session Poisoningghsa · 2026-07-30
- highGHSA-h669-8m4g-r2hc: MCP Ruby SDK: Unbounded JSON-RPC request body causes uncontrolled memory allocation in St…ghsa · 2026-07-30
- mediumGHSA-52jp-gj8w-j6xh: MCP Ruby SDK: Unbounded session retention in StreamableHTTPTransport allows memory exhaus…ghsa · 2026-07-30
More from CERT-Bund (BSI) Security Advisories
- medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow denial of service2026-07-31
- medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow Denial of Service2026-07-31
- medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities2026-07-31
- medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow denial of service2026-07-31
- medium[UPDATE] [medium] Linux Kernel (ntfs3): Vulnerability allows information disclosure2026-07-31