Is erb affected by CVE-2026-41316?

RubyGems erb is affected in =4.0.4 =5.0.0 =6.0.2 <6.0.4.

Is CVE-2026-41316 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.5%.

high

CVE-2026-41316

Q: Is CVE-2026-41316 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.5%.

RubyGems · erb

Summary

ERB has an @_init deserialization guard bypass via def_module / def_method / def_class

Severity: high
EPSS: 0.5% (p39)
Also known as: GHSA-q339-8rmv-2mhv
Published: 2026-04-24

References

https://github.com/ruby/erb/security/advisories/GHSA-q339-8rmv-2mhv
https://nvd.nist.gov/vuln/detail/CVE-2026-41316
https://github.com/ruby/erb

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.