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Vulnerabilities

Vulnerability · CVE-2026-41316

ERB is a templating system for Ruby.

Published Apr 24, 2026 · catalog updated Aug 24, 2026 · Gentoo Gentoo Linux

Check if you run it

No confirmed exploitation is on record for CVE-2026-41316. EPSS is 1.31%. Act only if a listed version of Gentoo Gentoo Linux is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.31%
Remediation
Advisory link
Affected products
Gentoo Gentoo Linux

ERB is a templating system for Ruby. Ruby 2.7.0 (before ERB 2.2.0 was published on rubygems.org) introduced an instance variable guard in and to prevent code execution when an ERB object is reconstructed via (deserialization). However, three other public methods that also evaluate via were not given the same guard: , , and . An attacker who can trigger on untrusted data in a Ruby application that has loaded can use (zero-arg, default parameters) as a code execution sink, bypassing the protection entirely. ERB 4.0.3.1, 4.0.4.1, 6.0.1.1, and 6.0.4 patch the issue.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-41316

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-41316. EPSS is 1.31%. Act only if a listed version of Gentoo Gentoo Linux is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-502: Deserialization of Untrusted Data; CWE-693: Protection Mechanism Failure. EPSS 1.31%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 24, 2026 · NIST NVD

    Detected

    ERB is a templating system for Ruby. Ruby 2.7.0 (before ERB 2.2.0 was published on rubygems.org) introduced an instance variable guard in and to prevent code execution when an ERB object is reconstructed via (deserialization). However, three other public methods that also evaluate via were not given the same guard: , , and . An attacker who can trigger on untrusted data in a Ruby application that

  2. Aug 24, 2026 · NIST NVD

    Updated

    ERB is a templating system for Ruby. Ruby 2.7.0 (before ERB 2.2.0 was published on rubygems.org) introduced an instance variable guard in and to prevent code execution when an ERB object is reconstructed via (deserialization). However, three other public methods that also evaluate via were not given the same guard: , , and . An attacker who can trigger on untrusted data in a Ruby application that

Sources

  • CVE.orgVulnerability recordCVE-2026-41316

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-41316

    30-day exploitation probability 1.3%

    first.org
  • Gentoo GLSAVendor advisoryCVE-2026-41316

    Ruby: Remote code execution (GLSA 202609-03) — Gentoo security

    security.gentoo.org
  • NIST NVDVulnerability recordCVE-2026-41316

    ERB is a templating system for Ruby. Ruby 2.7.0 (before ERB 2.2.0 was published on rubygems.org) introduced an instance variable guard in and to prevent code execution when an ERB object is reconstructed via (deserialization). Howeve

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.