Critical 9.8Published Jul 10, 2009

CVE-2009-2422The example code for the digest authentication functionality (http_authentication.rb) in Ruby on Rails before 2.3.3 defines an authenticate_or_request_with_http_digest block that returns nil instead…

Updated under an hour ago (Nov 2, 2026, 12:23 AM ET)

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It affects rubyonrails ruby_on_rails and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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The example code for the digest authentication functionality (http_authentication.rb) in Ruby on Rails before 2.3.3 defines an authenticate_or_request_with_http_digest block that returns nil instead of false when the user does not exist, which allows context-dependent attackers to bypass authentication for applications that are derived from this example by sending an invalid username without a password.

CVSS: 9.8 CRITICAL (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-287
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 16, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

rubyonrails ruby_on_rails rubyonrails:ruby_on_rails	before 2.3.3	NVD
apple mac_os_x apple:mac_os_x	from 10.6.0 before 10.6.3; 10.5.8	NVD
apple mac_os_x_server apple:mac_os_x_server	from 10.6.0 before 10.6.3; 10.5.8	NVD

References

References

http://lists.apple.com/archives/security-announce/2010//Mar/msg00001.html	mailing-list
http://n8.tumblr.com/post/117477059/security-hole-found-in-rails-2-3s	exploit, patch
http://secunia.com/advisories/35702	broken-link, vendor-advisory
http://support.apple.com/kb/HT4077	third-party-advisory
http://weblog.rubyonrails.org/2009/6/3/security-problem-with-authenticate_with_http_digest	patch
http://www.securityfocus.com/bid/35579	broken-link, patch, third-party-advisory, vdb-entry
http://www.vupen.com/english/advisories/2009/1802	broken-link, patch, vendor-advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/51528	third-party-advisory, vdb-entry

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.