[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: 2026-07-09
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 63% of all scored CVEs.

Referenced CVEs

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

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.

medium[UPDATE] [medium] Red Hat Enterprise Linux (ruby: net-imap): Multiple vulnerabilitiescert-bund · 2026-07-10
highGHSA-9pmc-p236-855h: Ruby CSS Parser: SSRF and Local File Disclosure in `CssParser::Parser#read_remote_file`ghsa · 2026-07-09
high[UPDATE] [high] HCL BigFix Compliance (Ruby): Multiple vulnerabilitiescert-bund · 2026-07-07
highCVE-2026-38969: ruby webrick through v1.9.2 WEBrick reparses trailer Content-Length into canonical request sta…nvd · 2026-07-02
highCVE-2026-38969: ruby webrick through v1.9.2 WEBrick reparses trailer Content-Length into canonical request sta…msrc · 2026-07-02
unknownCVE-2026-54903: Oj (Optimized JSON) is a JSON parser and Object marshaller packaged as a Ruby gem. In versions…nvd · 2026-07-01