Read the docs
TI-2008-03501 Aliases CVE-2008-3656GHSA-823x-6r7f-v9x6

Algorithmic complexity vulnerability in the WEBrick::HTTPUtils.split_header_value…

Priority HIGH 71CWE-399Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
— Not recorded in CVSS 2.0
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Complete
Fix status
Fixed

Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-399 and the CVSS impact.

Summary

Algorithmic complexity vulnerability in the WEBrick::HTTPUtils.split_header_value function in WEBrick::HTTP::DefaultFileHandler in WEBrick in 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 allows context-dependent attackers to cause a denial of service (CPU consumption) via a crafted HTTP request that is processed by a backtracking regular expression.

Why it matters now

EPSS 0.70202 99th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed Red Hat: 4 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 43

CPEVersionsRoleVendor
cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*up to 1.8.5Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.6.8:*:*:*:*:*:*:*1.6.8Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.0:*:*:*:*:*:*:*1.8.0Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.1:*:*:*:*:*:*:*1.8.1Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.1:-9:*:*:*:*:*:*1.8.1 -9Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.2:*:*:*:*:*:*:*1.8.2Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.2:preview2:*:*:*:*:*:*1.8.2 preview2Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.2:preview3:*:*:*:*:*:*1.8.2 preview3Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.2:preview4:*:*:*:*:*:*1.8.2 preview4Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.3:*:*:*:*:*:*:*1.8.3Vulnerableruby
  • cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:* Versions up to 1.8.5 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.6.8:*:*:*:*:*:*:* Versions 1.6.8 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.0:*:*:*:*:*:*:* Versions 1.8.0 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.1:*:*:*:*:*:*:* Versions 1.8.1 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.1:-9:*:*:*:*:*:* Versions 1.8.1 -9 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.2:*:*:*:*:*:*:* Versions 1.8.2 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.2:preview2:*:*:*:*:*:* Versions 1.8.2 preview2 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.2:preview3:*:*:*:*:*:* Versions 1.8.2 preview3 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.2:preview4:*:*:*:*:*:* Versions 1.8.2 preview4 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.3:*:*:*:*:*:*:* Versions 1.8.3 Vulnerable ·ruby
Show 33 more CPE
CPEVersionsRoleVendor
cpe:2.3:a:ruby-lang:ruby:1.8.3:preview1:*:*:*:*:*:*1.8.3 preview1Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.3:preview2:*:*:*:*:*:*1.8.3 preview2Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.3:preview3:*:*:*:*:*:*1.8.3 preview3Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.4:*:*:*:*:*:*:*1.8.4Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.4:preview1:*:*:*:*:*:*1.8.4 preview1Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.4:preview2:*:*:*:*:*:*1.8.4 preview2Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.4:preview3:*:*:*:*:*:*1.8.4 preview3Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.5:p11:*:*:*:*:*:*1.8.5 p11Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.5:p113:*:*:*:*:*:*1.8.5 p113Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.5:p115:*:*:*:*:*:*1.8.5 p115Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.5:p12:*:*:*:*:*:*1.8.5 p12Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.5:p2:*:*:*:*:*:*1.8.5 p2Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.5:p35:*:*:*:*:*:*1.8.5 p35Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.5:preview1:*:*:*:*:*:*1.8.5 preview1Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.5:preview2:*:*:*:*:*:*1.8.5 preview2Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.5:preview3:*:*:*:*:*:*1.8.5 preview3Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.5:preview4:*:*:*:*:*:*1.8.5 preview4Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.5:preview5:*:*:*:*:*:*1.8.5 preview5Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.6:*:*:*:*:*:*:*1.8.6Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.6:p110:*:*:*:*:*:*1.8.6 p110Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.6:p114:*:*:*:*:*:*1.8.6 p114Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.6:preview1:*:*:*:*:*:*1.8.6 preview1Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.6:preview2:*:*:*:*:*:*1.8.6 preview2Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.6:preview3:*:*:*:*:*:*1.8.6 preview3Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.7:*:*:*:*:*:*:*1.8.7Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.7:p17:*:*:*:*:*:*1.8.7 p17Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.7:p22:*:*:*:*:*:*1.8.7 p22Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.7:p71:*:*:*:*:*:*1.8.7 p71Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.7:preview1:*:*:*:*:*:*1.8.7 preview1Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.7:preview2:*:*:*:*:*:*1.8.7 preview2Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.7:preview3:*:*:*:*:*:*1.8.7 preview3Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.8.7:preview4:*:*:*:*:*:*1.8.7 preview4Vulnerableruby
cpe:2.3:a:ruby-lang:ruby:1.9.0:*:*:*:*:*:*:*1.9.0Vulnerableruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.3:preview1:*:*:*:*:*:* Versions 1.8.3 preview1 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.3:preview2:*:*:*:*:*:* Versions 1.8.3 preview2 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.3:preview3:*:*:*:*:*:* Versions 1.8.3 preview3 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.4:*:*:*:*:*:*:* Versions 1.8.4 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.4:preview1:*:*:*:*:*:* Versions 1.8.4 preview1 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.4:preview2:*:*:*:*:*:* Versions 1.8.4 preview2 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.4:preview3:*:*:*:*:*:* Versions 1.8.4 preview3 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.5:p11:*:*:*:*:*:* Versions 1.8.5 p11 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.5:p113:*:*:*:*:*:* Versions 1.8.5 p113 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.5:p115:*:*:*:*:*:* Versions 1.8.5 p115 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.5:p12:*:*:*:*:*:* Versions 1.8.5 p12 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.5:p2:*:*:*:*:*:* Versions 1.8.5 p2 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.5:p35:*:*:*:*:*:* Versions 1.8.5 p35 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.5:preview1:*:*:*:*:*:* Versions 1.8.5 preview1 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.5:preview2:*:*:*:*:*:* Versions 1.8.5 preview2 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.5:preview3:*:*:*:*:*:* Versions 1.8.5 preview3 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.5:preview4:*:*:*:*:*:* Versions 1.8.5 preview4 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.5:preview5:*:*:*:*:*:* Versions 1.8.5 preview5 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.6:*:*:*:*:*:*:* Versions 1.8.6 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.6:p110:*:*:*:*:*:* Versions 1.8.6 p110 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.6:p114:*:*:*:*:*:* Versions 1.8.6 p114 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.6:preview1:*:*:*:*:*:* Versions 1.8.6 preview1 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.6:preview2:*:*:*:*:*:* Versions 1.8.6 preview2 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.6:preview3:*:*:*:*:*:* Versions 1.8.6 preview3 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.7:*:*:*:*:*:*:* Versions 1.8.7 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.7:p17:*:*:*:*:*:* Versions 1.8.7 p17 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.7:p22:*:*:*:*:*:* Versions 1.8.7 p22 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.7:p71:*:*:*:*:*:* Versions 1.8.7 p71 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.7:preview1:*:*:*:*:*:* Versions 1.8.7 preview1 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.7:preview2:*:*:*:*:*:* Versions 1.8.7 preview2 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.7:preview3:*:*:*:*:*:* Versions 1.8.7 preview3 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.8.7:preview4:*:*:*:*:*:* Versions 1.8.7 preview4 Vulnerable ·ruby
  • cpe:2.3:a:ruby-lang:ruby:1.9.0:*:*:*:*:*:*:* Versions 1.9.0 Vulnerable ·ruby

Remediation

Red Hat 4 advisories

  • RHSA-2026:8838 Released 2026-04-17 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images ruby4.0-4.0.0-33.3.hum1@aarch64, ruby4.0-4.0.0-33.3.hum1@src, ruby4.0-4.0.0-33.3.hum1@x86_64 +10
  • RHSA-2026:7307 Released 2026-04-09 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images ruby3.4-3.4.8-31.1.hum1@aarch64, ruby3.4-3.4.8-31.1.hum1@src, ruby3.4-3.4.8-31.1.hum1@x86_64 +10
  • RHSA-2026:7305 Released 2026-04-09 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs bug fix and enhancement update
    • Red Hat Hardened Images ruby3.3-3.3.10-23.1.hum1@aarch64, ruby3.3-3.3.10-23.1.hum1@src, ruby3.3-3.3.10-23.1.hum1@x86_64 +10
Show 1 more Red Hat advisories
  • RHSA-2008:0897 Released 2008-10-21 · Red Hat rating Moderate
    ruby security update
    • Red Hat Enterprise Linux (v. 5 server) ruby-1.8.5-5.el5_2.5, ruby-1.8.5-5.el5_2.5.i386, ruby-1.8.5-5.el5_2.5.ia64 +33
    • Red Hat Enterprise Linux AS version 4 irb-1.8.1-7.el4_7.1, irb-1.8.1-7.el4_7.1.i386, irb-1.8.1-7.el4_7.1.ia64 +25
    • Red Hat Enterprise Linux Desktop (v. 5 client) ruby-1.8.5-5.el5_2.5, ruby-1.8.5-5.el5_2.5.i386, ruby-docs-1.8.5-5.el5_2.5 +11
    • Red Hat Enterprise Linux Desktop Workstation (v. 5 client) ruby-1.8.5-5.el5_2.5, ruby-devel-1.8.5-5.el5_2.5, ruby-devel-1.8.5-5.el5_2.5.i386 +2
    • Red Hat Enterprise Linux Desktop version 4 irb-1.8.1-7.el4_7.1, irb-1.8.1-7.el4_7.1.i386, ruby-1.8.1-7.el4_7.1 +11
    • Red Hat Enterprise Linux ES version 4 irb-1.8.1-7.el4_7.1, irb-1.8.1-7.el4_7.1.i386, irb-1.8.1-7.el4_7.1.ia64 +18
    • Red Hat Enterprise Linux WS version 4 irb-1.8.1-7.el4_7.1, irb-1.8.1-7.el4_7.1.i386, irb-1.8.1-7.el4_7.1.ia64 +18

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux (v. 5 server)Fixed RHSA-2008:0897
Red Hat Enterprise Linux AS version 4Fixed RHSA-2008:0897
Red Hat Enterprise Linux Desktop (v. 5 client)Fixed RHSA-2008:0897
Red Hat Enterprise Linux Desktop Workstation (v. 5 client)Fixed RHSA-2008:0897
Red Hat Enterprise Linux Desktop version 4Fixed RHSA-2008:0897
Red Hat Enterprise Linux ES version 4Fixed RHSA-2008:0897
Red Hat Enterprise Linux WS version 4Fixed RHSA-2008:0897
Red Hat Hardened ImagesFixed RHSA-2026:7305, RHSA-2026:7307, RHSA-2026:8838

Timeline

  1. 2026-10-02 Threatist record created from CVE-2008-3656
  2. 2026-10-03 Alias added: GHSA-823x-6r7f-v9x6

References

Exploit 1

Advisory 9

Other 7

  • TI-2026-71508 Integer overflow in GitLab allows code execution on the server KEVCVSS 3.1CRITICAL 10.0
  • TI-2017-12709 Ruby before 2.4.3 allows Net::FTP command injection. CVSS 3.0HIGH 8.8
  • TI-2021-09891 In Ruby through 3.0 on Windows, a remote attacker can submit a crafted path when a Web… CVSS 3.1HIGH 7.5
  • TI-2013-03637 Heap-based buffer overflow in Ruby 1.8, 1.9 before 1.9.3-p484, 2.0 before 2.0.0-p353, 2.1… CVSS 2.0MEDIUM 6.8
  • TI-2018-11751 An issue was discovered in the OpenSSL library in Ruby before 2.3.8, 2.4.x before 2.4.5… CVSS 3.0CRITICAL 9.8
  • TI-2017-07892 The Basic authentication code in WEBrick library in Ruby before 2.2.8, 2.3.x before… CVSS 3.0HIGH 8.8
See all 92 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences