CVE-2026-38969
ruby webrick through v1.9.2 WEBrick reparses trailer Content-Length into canonical request state, enabling request smuggling.
CSIRTS triage
- What
- WEBrick reparses trailer Content-Length into canonical request state, enabling request smuggling.
- Who is affected
- Deployments using WEBrick up to version 1.9.2 are affected.
- Urgency
- Remediation is urgent due to the high severity and potential for exploitation.
- Action
- Upgrade WEBrick to a version beyond 1.9.2.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 21% of all EPSS-scored CVEs.
Advisory coverage (2)
External references
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[](https://www.csirts.com/cve/CVE-2026-38969)