CVE-2017-11173

Missing anchor in generated regex for rack-cors before 0.4.1 allows a malicious third-party site to perform CORS requests. If the configuration were intended to allow only the trusted example.com domain name and not the malicious example.net domain name, then example.com.example.net (as well as example.com-example.net) would be inadvertently allowed.

• http://seclists.org/fulldisclosure/2017/Jul/22Mailing List, Third Party Advisory
• http://www.debian.org/security/2017/dsa-3931Third Party Advisory
• https://github.com/cyu/rack-cors/commit/42ebe6caa8e85ffa9c8a171bda668ba1acc7a5e6Patch, Third Party Advisory
• https://packetstormsecurity.com/files/143345/rack-cors-Missing-Anchor.htmlThird Party Advisory, VDB Entry
• http://seclists.org/fulldisclosure/2017/Jul/22Mailing List, Third Party Advisory
• http://www.debian.org/security/2017/dsa-3931Third Party Advisory
• https://github.com/cyu/rack-cors/commit/42ebe6caa8e85ffa9c8a171bda668ba1acc7a5e6Patch, Third Party Advisory
• https://packetstormsecurity.com/files/143345/rack-cors-Missing-Anchor.htmlThird Party Advisory, VDB Entry

Published

Jul 13, 2017

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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