[UPDATE] [high] Ruby and Ruby on Rails (erb gem): Vulnerability allows code execution

highCVE-2026-41316

A remote, anonymous attacker can exploit a vulnerability in Ruby and Ruby on Rails to bypass security measures and execute arbitrary code.

CSIRTS triage

vendor: Ruby product: Ruby and Ruby on Rails Remote code execution

What: A vulnerability allows a remote attacker to execute arbitrary code.
Who is affected: Deployments of Ruby and Ruby on Rails.
Urgency: Remediation is high urgency due to the potential for exploitation.
Action: Update to the latest version of Ruby and Ruby on Rails.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Ruby and Ruby on Rails

Get an email when a new Ruby and Ruby on Rails advisory drops — max one per day, one-click unsubscribe.

Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: high
Published: 2026-08-12
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1187

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 64% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-41316	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

high[NEW] [high] Ruby: Multiple vulnerabilitiescert-bund

Recent advisories for Ruby and 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.

unknownCVE-2026-44476: Doorkeeper is an OAuth 2 provider for Ruby on Rails. In version 1.9.0, an attacker who knows o…nvd · 2026-08-25
mediumCVE-2026-79771: Nokogiri versions before 1.19.3 contain a memory leak in the XSLT Stylesheet transform method …nvd · 2026-08-25
medium[UPDATE] [medium] Ruby: Vulnerability allows Denial of Servicecert-bund · 2026-08-17
high[NEW] [high] Ruby: Multiple vulnerabilitiescert-bund · 2026-08-17
high[UPDATE] [high] HCL BigFix Compliance (Ruby): Multiple vulnerabilitiescert-bund · 2026-08-17
highCVE-2026-53970: ZeroBrew version 0.3.1 and prior contains a missing integrity verification vulnerability in th…nvd · 2026-08-14