What is CVE-2026-41316?

CVE-2026-41316 is a high-severity vulnerability in Ruby Erb, classified under Protection Mechanism Failure. CVSS score: 8.1/10. Published 2026-04-24.

How severe is CVE-2026-41316?

High severity. CVSS v3 base score is 8.1 out of 10.

Vulnerability in Ruby Erb

CVE-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 `@_init` instance variable guard in `ERB#result` and `ERB#run` to prevent code execution when an ERB object is reconstructed via…

EPSS: 0.000 (15.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Ruby Erb — versions < 4.0.3.1, = 4.0.4, >= 5.0.0, < 6.0.1.1

Weakness classification (CWE)

CWE-693 — Protection Mechanism Failure

References

https://github.com/ruby/erb/security/advisories/GHSA-q339-8rmv-2mhv (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-41316?: CVE-2026-41316 is a high-severity vulnerability in Ruby Erb, classified under Protection Mechanism Failure. CVSS score: 8.1/10. Published 2026-04-24.
How severe is CVE-2026-41316?: High severity. CVSS v3 base score is 8.1 out of 10.