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CVE-2009-4492

WEBrick Improper Input Validation vulnerability

7.5 HighPublic exploitFix available

CVE-2009-4492 is a high vulnerability (CVSS 7.5) in Ruby-lang Webrick, published January 13, 2010. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 16.2%, the 96th percentile. Fixed in webrick 1.4.0.

WEBrick 1.3.1 in Ruby 1.8.6 through patchlevel 383, 1.8.7 through patchlevel 248, 1.8.8dev, 1.9.1 through patchlevel 376, and 1.9.2dev writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.

Exploit likelihood

16.2%Up 5.2 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 7.5

WEBrick 1.3.1 in Ruby 1.8.6 through patchlevel 383, 1.8.7 through patchlevel 248, 1.8.8dev, 1.9.1 through patchlevel 376, and 1.9.2dev writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.

Record
CVE-2009-4492
CVSS 2.0
7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Updated
2026-11-02
CVE List No score

WEBrick 1.3.1 in Ruby 1.8.6 through patchlevel 383, 1.8.7 through patchlevel 248, 1.8.8dev, 1.9.1 through patchlevel 376, and 1.9.2dev writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.

Record
CVE-2009-4492
Updated
2026-11-02
EUVDEUVD-2017-0178 No score

WEBrick 1.3.1 in Ruby 1.8.6 through patchlevel 383, 1.8.7 through patchlevel 248, 1.8.8dev, 1.9.1 through patchlevel 376, and 1.9.2dev writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.

Record
EUVD-2017-0178
Updated
2026-11-03
GitHub AdvisoriesGHSA-6mq2-37j5-w6r6 No score

WEBrick Improper Input Validation vulnerability

WEBrick 1.3.1 in Ruby 1.8.6 through patchlevel 383, 1.8.7 through patchlevel 248, 1.8.8dev, 1.9.1 through patchlevel 376, and 1.9.2dev writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.

Record
GHSA-6mq2-37j5-w6r6
Weakness
CWE-20
Updated
2026-11-02
OSVGHSA-6mq2-37j5-w6r6 No score

WEBrick Improper Input Validation vulnerability

WEBrick 1.3.1 in Ruby 1.8.6 through patchlevel 383, 1.8.7 through patchlevel 248, 1.8.8dev, 1.9.1 through patchlevel 376, and 1.9.2dev writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.

Record
GHSA-6mq2-37j5-w6r6
Weakness
CWE-20
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
webrick
RubyGems
 through 1.3.1
1.4.0
webrick
RubyGems
 before 1.4.0, plus listed versions
1.3.11.4.0.beta1
1.4.0
irb
Red Hat:enterprise_linux:4::as
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby
Red Hat:enterprise_linux:4::as
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-debuginfo
Red Hat:enterprise_linux:4::as
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-devel
Red Hat:enterprise_linux:4::as
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-docs
Red Hat:enterprise_linux:4::as
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-libs
Red Hat:enterprise_linux:4::as
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-mode
Red Hat:enterprise_linux:4::as
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-tcltk
Red Hat:enterprise_linux:4::as
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
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Affected packages
PackageAffectedFixed
irb
Red Hat:enterprise_linux:4::desktop
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby
Red Hat:enterprise_linux:4::desktop
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-debuginfo
Red Hat:enterprise_linux:4::desktop
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-devel
Red Hat:enterprise_linux:4::desktop
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-docs
Red Hat:enterprise_linux:4::desktop
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-libs
Red Hat:enterprise_linux:4::desktop
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-mode
Red Hat:enterprise_linux:4::desktop
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-tcltk
Red Hat:enterprise_linux:4::desktop
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
irb
Red Hat:enterprise_linux:4::es
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby
Red Hat:enterprise_linux:4::es
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-debuginfo
Red Hat:enterprise_linux:4::es
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-devel
Red Hat:enterprise_linux:4::es
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-docs
Red Hat:enterprise_linux:4::es
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-libs
Red Hat:enterprise_linux:4::es
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-mode
Red Hat:enterprise_linux:4::es
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-tcltk
Red Hat:enterprise_linux:4::es
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
irb
Red Hat:enterprise_linux:4::ws
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby
Red Hat:enterprise_linux:4::ws
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-debuginfo
Red Hat:enterprise_linux:4::ws
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-devel
Red Hat:enterprise_linux:4::ws
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-docs
Red Hat:enterprise_linux:4::ws
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-libs
Red Hat:enterprise_linux:4::ws
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-mode
Red Hat:enterprise_linux:4::ws
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby-tcltk
Red Hat:enterprise_linux:4::ws
 before 0:1.8.1-16.el4
0:1.8.1-16.el4
ruby
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-19.el5_6.1
0:1.8.5-19.el5_6.1
ruby-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-19.el5_6.1
0:1.8.5-19.el5_6.1
ruby-devel
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-19.el5_6.1
0:1.8.5-19.el5_6.1
ruby-docs
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-19.el5_6.1
0:1.8.5-19.el5_6.1
ruby-irb
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-19.el5_6.1
0:1.8.5-19.el5_6.1
ruby-libs
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-19.el5_6.1
0:1.8.5-19.el5_6.1
ruby-mode
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-19.el5_6.1
0:1.8.5-19.el5_6.1
ruby-rdoc
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-19.el5_6.1
0:1.8.5-19.el5_6.1
ruby-ri
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-19.el5_6.1
0:1.8.5-19.el5_6.1
ruby-tcltk
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-19.el5_6.1
0:1.8.5-19.el5_6.1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
Exploit-DBRuby 1.9.1 - WEBrick 'Terminal Escape Sequence in Logs' Command Injection2010-01-11

History

History
WhenChangedSources
2026-11-03aliasesEUVD
2026-11-02createdCVE List, Exploit-DB, GitHub Advisories, NVD, OSV

References

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