High severity vulnerability that affects thin

HIGH 7.5CVE-2009-3287 · GHSA-j24p-r6wx-r79w · Published 22/09/2009 · updated 16/06/2026

In short

CVE-2009-3287 is a HIGH (CVSS 7.5) vulnerability affecting thin, thin (macournoyer).
Chance of exploitation in the next 30 days (EPSS): 1.4%, higher than 72.3% of all vulnerabilities.
Fix: update to 1.2.4 or later.

Package	Affected versions	Patched versions
thin RubyGems	`< 1.2.4`	`1.2.4`
thin macournoyer	`= 0.4.0= 0.4.1= 0.5.0= 0.5.1= 0.5.2= 0.5.3= 0.5.4= 0.6.0= 0.6.3= 0.6.4= 0.7.0= 0.7.1= 0.8.0= 0.8.1= 0.8.2= 1.0.0= 1.1.0= 1.1.1= 1.2.0= 1.2.1≤ 1.2.2`	No fix yet

Description

lib/thin/connection.rb in Thin web server before 1.2.4 relies on the X-Forwarded-For header to determine the IP address of the client, which allows remote attackers to spoof the IP address and hide activities via a modified X-Forwarded-For header.

NVD description

References

nvd.nist.gov/vuln/detail/CVE-2009-3287 · ADVISORY
GitHub Advisory GHSA-j24p-r6wx-r79w · ADVISORY
rubysec/ruby-advisory-db · WEB
macournoyer/thin · PACKAGE
macournoyer/thin · WEB
macournoyer/thin commit 7bd0279 · WEB
openwall.com/lists/oss-security/2009/09/12/1 · WEB

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