Is webrick affected by CVE-2025-6442?

RubyGems webrick is affected in <1.8.2.

Is CVE-2025-6442 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

medium

CVE-2025-6442

Q: Is CVE-2025-6442 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

RubyGems · webrick

Summary

Ruby WEBrick read_headers method can lead to HTTP Request/Response Smuggling

Severity: medium
EPSS: 0.4% (p34)
Also known as: GHSA-r995-q44h-hr64
Published: 2025-06-26

References

https://nvd.nist.gov/vuln/detail/CVE-2025-6442
https://github.com/ruby/webrick/commit/ee60354bcb84ec33b9245e1d1aa6e1f7e8132101#diff-ad02984d873efb089aa51551bc6b7d307a53e0ba1ac439e91d69c2e58a478864
https://github.com/ruby/webrick

Related advisories

CVE-2024-47220 — high · RubyGems/webrick
CVE-2020-25613 — high · RubyGems/webrick
CVE-2017-10784 — high · RubyGems/webrick
CVE-2008-4310 — high · RubyGems/webrick

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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.