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CVE-2008-3655

Ruby 1.8.5 and earlier, 1.8.6 through 1.8.6-p286, 1.8.7 through 1.8.7-p71, and 1.9 through r18423...

7.5 HighPublic exploitFix available

CVE-2008-3655 is a high vulnerability (CVSS 7.5) in Ruby-lang Ruby, published August 13, 2008. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 14.1%, the 96th percentile. Fixed in ruby1.8 1.8.5-4etch3.

Ruby 1.8.5 and earlier, 1.8.6 through 1.8.6-p286, 1.8.7 through 1.8.7-p71, and 1.9 through r18423 does not properly restrict access to critical variables and methods at various safe levels, which allows context-dependent attackers to bypass intended access restrictions via (1) untrace_var, (2) $PROGRAM_NAME, and (3) syslog at safe level 4, and (4) insecure methods at safe levels 1 through 3.

Exploit likelihood

14.1%Up 1.5 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 7.5

Ruby 1.8.5 and earlier, 1.8.6 through 1.8.6-p286, 1.8.7 through 1.8.7-p71, and 1.9 through r18423 does not properly restrict access to critical variables and methods at various safe levels, which allows context-dependent attackers to bypass intended access restrictions via (1) untrace_var, (2) $PROGRAM_NAME, and (3) syslog at safe level 4, and (4) insecure methods at safe levels 1 through 3.

Record
CVE-2008-3655
CVSS 2.0
7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness
CWE-264
Updated
2026-11-02
CVE List No score

Ruby 1.8.5 and earlier, 1.8.6 through 1.8.6-p286, 1.8.7 through 1.8.7-p71, and 1.9 through r18423 does not properly restrict access to critical variables and methods at various safe levels, which allows context-dependent attackers to bypass intended access restrictions via (1) untrace_var, (2) $PROGRAM_NAME, and (3) syslog at safe level 4, and (4) insecure methods at safe levels 1 through 3.

Record
CVE-2008-3655
Updated
2026-11-02
EUVDEUVD-2008-3641 No score

Ruby 1.8.5 and earlier, 1.8.6 through 1.8.6-p286, 1.8.7 through 1.8.7-p71, and 1.9 through r18423 does not properly restrict access to critical variables and methods at various safe levels, which allows context-dependent attackers to bypass intended access restrictions via (1) untrace_var, (2) $PROGRAM_NAME, and (3) syslog at safe level 4, and (4) insecure methods at safe levels 1 through 3.

Record
EUVD-2008-3641
Updated
2026-11-03
GitHub AdvisoriesGHSA-p524-ppf2-w36w No score

Ruby 1.8.5 and earlier, 1.8.6 through 1.8.6-p286, 1.8.7 through 1.8.7-p71, and 1.9 through r18423...

Ruby 1.8.5 and earlier, 1.8.6 through 1.8.6-p286, 1.8.7 through 1.8.7-p71, and 1.9 through r18423 does not properly restrict access to critical variables and methods at various safe levels, which allows context-dependent attackers to bypass intended access restrictions via (1) untrace_var, (2) $PROGRAM_NAME, and (3) syslog at safe level 4, and (4) insecure methods at safe levels 1 through 3.

Record
GHSA-p524-ppf2-w36w
Updated
2026-11-02
OSVRHSA-2026:7305 7.5

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Record
RHSA-2026:7305
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVRHSA-2026:7307 7.5

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Record
RHSA-2026:7307
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVRHSA-2026:8838 7.5

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Record
RHSA-2026:8838
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
ruby1.8
Debian:4.0
 before 1.8.5-4etch3, plus listed versions
1.8.5-41.8.5-4etch11.8.5-4etch2
1.8.5-4etch3
ruby1.9
Debian:4.0
 before 1.9.0+20060609-1etch3, plus listed versions
1.9.0+20060609-11.9.0+20060609-1etch11.9.0+20060609-1etch2
1.9.0+20060609-1etch3
irb
Red Hat:enterprise_linux:2.1::as
 before 0:1.6.4-7.el2
0:1.6.4-7.el2
ruby
Red Hat:enterprise_linux:2.1::as
 before 0:1.6.4-7.el2
0:1.6.4-7.el2
ruby-devel
Red Hat:enterprise_linux:2.1::as
 before 0:1.6.4-7.el2
0:1.6.4-7.el2
ruby-docs
Red Hat:enterprise_linux:2.1::as
 before 0:1.6.4-7.el2
0:1.6.4-7.el2
ruby-libs
Red Hat:enterprise_linux:2.1::as
 before 0:1.6.4-7.el2
0:1.6.4-7.el2
ruby-tcltk
Red Hat:enterprise_linux:2.1::as
 before 0:1.6.4-7.el2
0:1.6.4-7.el2
irb
Red Hat:enterprise_linux:2.1::es
 before 0:1.6.4-7.el2
0:1.6.4-7.el2
ruby
Red Hat:enterprise_linux:2.1::es
 before 0:1.6.4-7.el2
0:1.6.4-7.el2
Show 114 moreShow less
Affected packages
PackageAffectedFixed
ruby-devel
Red Hat:enterprise_linux:2.1::es
 before 0:1.6.4-7.el2
0:1.6.4-7.el2
ruby-docs
Red Hat:enterprise_linux:2.1::es
 before 0:1.6.4-7.el2
0:1.6.4-7.el2
ruby-libs
Red Hat:enterprise_linux:2.1::es
 before 0:1.6.4-7.el2
0:1.6.4-7.el2
ruby-tcltk
Red Hat:enterprise_linux:2.1::es
 before 0:1.6.4-7.el2
0:1.6.4-7.el2
irb
Red Hat:enterprise_linux:2.1::ws
 before 0:1.6.4-7.el2
0:1.6.4-7.el2
ruby
Red Hat:enterprise_linux:2.1::ws
 before 0:1.6.4-7.el2
0:1.6.4-7.el2
ruby-devel
Red Hat:enterprise_linux:2.1::ws
 before 0:1.6.4-7.el2
0:1.6.4-7.el2
ruby-docs
Red Hat:enterprise_linux:2.1::ws
 before 0:1.6.4-7.el2
0:1.6.4-7.el2
ruby-libs
Red Hat:enterprise_linux:2.1::ws
 before 0:1.6.4-7.el2
0:1.6.4-7.el2
ruby-tcltk
Red Hat:enterprise_linux:2.1::ws
 before 0:1.6.4-7.el2
0:1.6.4-7.el2
irb
Red Hat:enterprise_linux:3::as
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby
Red Hat:enterprise_linux:3::as
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-debuginfo
Red Hat:enterprise_linux:3::as
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-devel
Red Hat:enterprise_linux:3::as
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-docs
Red Hat:enterprise_linux:3::as
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-libs
Red Hat:enterprise_linux:3::as
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-mode
Red Hat:enterprise_linux:3::as
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-tcltk
Red Hat:enterprise_linux:3::as
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
irb
Red Hat:enterprise_linux:3::desktop
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby
Red Hat:enterprise_linux:3::desktop
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-debuginfo
Red Hat:enterprise_linux:3::desktop
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-devel
Red Hat:enterprise_linux:3::desktop
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-docs
Red Hat:enterprise_linux:3::desktop
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-libs
Red Hat:enterprise_linux:3::desktop
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-mode
Red Hat:enterprise_linux:3::desktop
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-tcltk
Red Hat:enterprise_linux:3::desktop
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
irb
Red Hat:enterprise_linux:3::es
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby
Red Hat:enterprise_linux:3::es
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-debuginfo
Red Hat:enterprise_linux:3::es
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-devel
Red Hat:enterprise_linux:3::es
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-docs
Red Hat:enterprise_linux:3::es
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-libs
Red Hat:enterprise_linux:3::es
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-mode
Red Hat:enterprise_linux:3::es
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-tcltk
Red Hat:enterprise_linux:3::es
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
irb
Red Hat:enterprise_linux:3::ws
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby
Red Hat:enterprise_linux:3::ws
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-debuginfo
Red Hat:enterprise_linux:3::ws
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-devel
Red Hat:enterprise_linux:3::ws
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-docs
Red Hat:enterprise_linux:3::ws
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-libs
Red Hat:enterprise_linux:3::ws
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-mode
Red Hat:enterprise_linux:3::ws
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
ruby-tcltk
Red Hat:enterprise_linux:3::ws
 before 0:1.6.8-13.el3
0:1.6.8-13.el3
irb
Red Hat:enterprise_linux:4::as
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby
Red Hat:enterprise_linux:4::as
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-debuginfo
Red Hat:enterprise_linux:4::as
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-devel
Red Hat:enterprise_linux:4::as
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-docs
Red Hat:enterprise_linux:4::as
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-libs
Red Hat:enterprise_linux:4::as
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-mode
Red Hat:enterprise_linux:4::as
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-tcltk
Red Hat:enterprise_linux:4::as
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
irb
Red Hat:enterprise_linux:4::desktop
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby
Red Hat:enterprise_linux:4::desktop
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-debuginfo
Red Hat:enterprise_linux:4::desktop
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-devel
Red Hat:enterprise_linux:4::desktop
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-docs
Red Hat:enterprise_linux:4::desktop
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-libs
Red Hat:enterprise_linux:4::desktop
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-mode
Red Hat:enterprise_linux:4::desktop
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-tcltk
Red Hat:enterprise_linux:4::desktop
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
irb
Red Hat:enterprise_linux:4::es
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby
Red Hat:enterprise_linux:4::es
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-debuginfo
Red Hat:enterprise_linux:4::es
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-devel
Red Hat:enterprise_linux:4::es
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-docs
Red Hat:enterprise_linux:4::es
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-libs
Red Hat:enterprise_linux:4::es
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-mode
Red Hat:enterprise_linux:4::es
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-tcltk
Red Hat:enterprise_linux:4::es
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
irb
Red Hat:enterprise_linux:4::ws
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby
Red Hat:enterprise_linux:4::ws
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-debuginfo
Red Hat:enterprise_linux:4::ws
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-devel
Red Hat:enterprise_linux:4::ws
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-docs
Red Hat:enterprise_linux:4::ws
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-libs
Red Hat:enterprise_linux:4::ws
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-mode
Red Hat:enterprise_linux:4::ws
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby-tcltk
Red Hat:enterprise_linux:4::ws
 before 0:1.8.1-7.el4_7.1
0:1.8.1-7.el4_7.1
ruby
Red Hat:enterprise_linux:5::client_workstation
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby-debuginfo
Red Hat:enterprise_linux:5::client_workstation
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby-devel
Red Hat:enterprise_linux:5::client_workstation
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby-mode
Red Hat:enterprise_linux:5::client_workstation
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby
Red Hat:enterprise_linux:5::client
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby-debuginfo
Red Hat:enterprise_linux:5::client
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby-docs
Red Hat:enterprise_linux:5::client
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby-irb
Red Hat:enterprise_linux:5::client
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby-libs
Red Hat:enterprise_linux:5::client
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby-rdoc
Red Hat:enterprise_linux:5::client
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby-ri
Red Hat:enterprise_linux:5::client
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby-tcltk
Red Hat:enterprise_linux:5::client
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby-debuginfo
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby-devel
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby-docs
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby-irb
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby-libs
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby-mode
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby-rdoc
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby-ri
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby-tcltk
Red Hat:enterprise_linux:5::server
 before 0:1.8.5-5.el5_2.5
0:1.8.5-5.el5_2.5
ruby3.3
Red Hat:hummingbird:1
 before 0:3.3.10-23.1.hum1
0:3.3.10-23.1.hum1
ruby3.3-bundled-gems
Red Hat:hummingbird:1
 before 0:3.3.10-23.1.hum1
0:3.3.10-23.1.hum1
ruby3.3-default-gems
Red Hat:hummingbird:1
 before 0:3.3.10-23.1.hum1
0:3.3.10-23.1.hum1
ruby3.3-devel
Red Hat:hummingbird:1
 before 0:3.3.10-23.1.hum1
0:3.3.10-23.1.hum1
ruby3.3-doc
Red Hat:hummingbird:1
 before 0:3.3.10-23.1.hum1
0:3.3.10-23.1.hum1
ruby3.3-libs
Red Hat:hummingbird:1
 before 0:3.3.10-23.1.hum1
0:3.3.10-23.1.hum1
ruby3.4
Red Hat:hummingbird:1
 before 0:3.4.8-31.1.hum1
0:3.4.8-31.1.hum1
ruby3.4-bundled-gems
Red Hat:hummingbird:1
 before 0:3.4.8-31.1.hum1
0:3.4.8-31.1.hum1
ruby3.4-default-gems
Red Hat:hummingbird:1
 before 0:3.4.8-31.1.hum1
0:3.4.8-31.1.hum1
ruby3.4-devel
Red Hat:hummingbird:1
 before 0:3.4.8-31.1.hum1
0:3.4.8-31.1.hum1
ruby3.4-doc
Red Hat:hummingbird:1
 before 0:3.4.8-31.1.hum1
0:3.4.8-31.1.hum1
ruby3.4-libs
Red Hat:hummingbird:1
 before 0:3.4.8-31.1.hum1
0:3.4.8-31.1.hum1
ruby4.0
Red Hat:hummingbird:1
 before 0:4.0.0-33.3.hum1
0:4.0.0-33.3.hum1
ruby4.0-bundled-gems
Red Hat:hummingbird:1
 before 0:4.0.0-33.3.hum1
0:4.0.0-33.3.hum1
ruby4.0-default-gems
Red Hat:hummingbird:1
 before 0:4.0.0-33.3.hum1
0:4.0.0-33.3.hum1
ruby4.0-devel
Red Hat:hummingbird:1
 before 0:4.0.0-33.3.hum1
0:4.0.0-33.3.hum1
ruby4.0-doc
Red Hat:hummingbird:1
 before 0:4.0.0-33.3.hum1
0:4.0.0-33.3.hum1
ruby4.0-libs
Red Hat:hummingbird:1
 before 0:4.0.0-33.3.hum1
0:4.0.0-33.3.hum1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
Exploit-DBRuby 1.9 dl - Module DL.dlopen Arbitrary Library Access2008-08-11
Exploit-DBRuby 1.9 - Safe Level Multiple Function Restriction Bypass2008-08-11

History

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

References

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Left out here: 15 references. The JSON record has them.

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