Is activesupport affected by CVE-2026-33170?

RubyGems activesupport is affected in >=8.1.0.beta1 =8.0.0.beta1 <8.0.4.1, <7.2.3.1.

Is CVE-2026-33170 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

medium

CVE-2026-33170

Q: Is CVE-2026-33170 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

RubyGems · activesupport

Summary

Rails Active Support has a possible XSS vulnerability in SafeBuffer#%

Severity: medium
EPSS: 0.3% (p24)
Also known as: GHSA-89vf-4333-qx8v
Published: 2026-03-23

References

https://github.com/rails/rails/security/advisories/GHSA-89vf-4333-qx8v
https://nvd.nist.gov/vuln/detail/CVE-2026-33170
https://github.com/rails/rails/commit/50d732af3b7c8aaf63cbcca0becbc00279b215b7

Related advisories

CVE-2020-8165 — critical · RubyGems/activesupport
CVE-2026-33176 — medium · RubyGems/activesupport
CVE-2026-33169 — medium · RubyGems/activesupport
CVE-2023-38037 — medium · RubyGems/activesupport
CVE-2023-28120 — medium · RubyGems/activesupport

Is your project exposed to this? Stateward checks every dependency on every pull request and flags it only if your code actually reaches it.

Check my repo

Summarize with AI

ChatGPT Claude Perplexity

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.