HIGH
ruby: WEBrick DoS vulnerability (CPU consumption)
Published Aug 13, 2008
7.8
HIGHCVSS 2.0
EPSS 70.20%
Description
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.
Affected products
No data.
OR
- ≤ 1.8.5
- 1.6.8
- 1.8.0
- 1.8.1
- 1.8.1
- 1.8.2
- 1.8.2
- 1.8.2
- 1.8.2
- 1.8.3
- 1.8.3
- 1.8.3
- 1.8.3
- 1.8.4
- 1.8.4
- 1.8.4
- 1.8.4
- 1.8.5
- 1.8.5
- 1.8.5
- 1.8.5
- 1.8.5
- 1.8.5
- 1.8.5
- 1.8.5
- 1.8.5
- 1.8.5
- 1.8.5
- 1.8.6
- 1.8.6
- 1.8.6
- 1.8.6
- 1.8.6
- 1.8.6
- 1.8.7
- 1.8.7
- 1.8.7
- 1.8.7
- 1.8.7
- 1.8.7
- 1.8.7
- 1.8.7
- 1.9.0
No data.
Red Hat Enterprise Linux 4
ruby-0:1.8.1-7.el4_7.1
Fixed · RHSA-2008:0897
Red Hat Enterprise Linux 5
ruby-0:1.8.5-5.el5_2.5
Fixed · RHSA-2008:0897
Red Hat Hardened Images
ruby3-3-main-3.3.10-23.1.hum1
Fixed · RHSA-2026:7305
Red Hat Hardened Images
ruby3-4-main-3.4.8-31.1.hum1
Fixed · RHSA-2026:7307
Red Hat Hardened Images
ruby4-0-main-4.0.0-33.3.hum1
Fixed · RHSA-2026:8838
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | ruby-0:1.8.1-7.el4_7.1 | Fixed | RHSA-2008:0897 |
| Red Hat Enterprise Linux 5 | ruby-0:1.8.5-5.el5_2.5 | Fixed | RHSA-2008:0897 |
| Red Hat Hardened Images | ruby3-3-main-3.3.10-23.1.hum1 | Fixed | RHSA-2026:7305 |
| Red Hat Hardened Images | ruby3-4-main-3.4.8-31.1.hum1 | Fixed | RHSA-2026:7307 |
| Red Hat Hardened Images | ruby4-0-main-4.0.0-33.3.hum1 | Fixed | RHSA-2026:8838 |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
7.8 HIGH NVD
AV:N/AC:L/Au:N/C:N/I:N/A:C
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Complete
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
70.20% 0.70202
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.70202
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (33 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 70.20% (0.70202) | 99.36th | v5 (v2026.06.15) |
| Jun 15, 2026 | 69.72% (0.69717) | 99.28th | v5 (v2026.06.15) |
| Jun 3, 2026 | 79.33% (0.79330) | 99.10th | v4 (v2025.03.14) |
| Jun 1, 2026 | 75.29% (0.75286) | 98.90th | v4 (v2025.03.14) |
| Apr 14, 2026 | 65.09% (0.65085) | 98.48th | v4 (v2025.03.14) |
| Mar 16, 2026 | 68.79% (0.68786) | 98.59th | v4 (v2025.03.14) |
| Jan 7, 2026 | 73.32% (0.73324) | 98.75th | v4 (v2025.03.14) |
| Dec 28, 2025 | 72.03% (0.72028) | 98.69th | v4 (v2025.03.14) |
| Dec 27, 2025 | 65.47% (0.65470) | 98.43th | v4 (v2025.03.14) |
| Dec 1, 2025 | 72.03% (0.72028) | 98.69th | v4 (v2025.03.14) |
| Nov 30, 2025 | 74.36% (0.74361) | 98.78th | v4 (v2025.03.14) |
| Oct 28, 2025 | 75.85% (0.75848) | 98.85th | v4 (v2025.03.14) |
| Oct 27, 2025 | 67.85% (0.67854) | 98.52th | v4 (v2025.03.14) |
| Oct 1, 2025 | 75.85% (0.75848) | 98.87th | v4 (v2025.03.14) |
| Apr 26, 2025 | 67.85% (0.67854) | 98.45th | v4 (v2025.03.14) |
| Apr 23, 2025 | 63.07% (0.63073) | 98.25th | v4 (v2025.03.14) |
| Mar 30, 2025 | 67.85% (0.67854) | 98.47th | v4 (v2025.03.14) |
| Mar 29, 2025 | 73.06% (0.73063) | 98.40th | v4 (v2025.03.14) |
| Mar 21, 2025 | 67.85% (0.67854) | 98.51th | v4 (v2025.03.14) |
| Mar 17, 2025 | 69.46% (0.69463) | 98.55th | v4 (v2025.03.14) |
| Jan 15, 2025 | 10.08% (0.10075) | 94.94th | v3 (v2023.03.01) |
| Dec 17, 2024 | 12.48% (0.12484) | 95.42th | v3 (v2023.03.01) |
| Dec 8, 2024 | 9.69% (0.09687) | 95.04th | v3 (v2023.03.01) |
| Sep 25, 2024 | 14.22% (0.14223) | 95.79th | v3 (v2023.03.01) |
| Jul 14, 2024 | 10.07% (0.10073) | 94.98th | v3 (v2023.03.01) |
| Jun 9, 2024 | 13.07% (0.13074) | 95.53th | v3 (v2023.03.01) |
| May 4, 2024 | 10.27% (0.10271) | 94.92th | v3 (v2023.03.01) |
| Jan 16, 2024 | 10.72% (0.10719) | 94.53th | v3 (v2023.03.01) |
| Aug 26, 2023 | 12.08% (0.12078) | 94.64th | v3 (v2023.03.01) |
| Jun 12, 2023 | 8.73% (0.08726) | 93.61th | v3 (v2023.03.01) |
| Mar 7, 2023 | 9.12% (0.09118) | 93.62th | v3 (v2023.03.01) |
| Mar 6, 2023 | 38.77% (0.38770) | 98.00th | v2 (v2022.01.01) |
| Feb 4, 2022 | 38.77% (0.38770) | 97.29th | v2 (v2022.01.01) |
Weaknesses (1)
References (34)
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=494401 x_refsource_CONFIRM
- http://lists.apple.com/archives/security-announce/2009/May/msg00002.html vendor-advisoryx_refsource_APPLE
- http://secunia.com/advisories/31430 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/31697 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/32165 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/32219 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/32255 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/32256 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/32371 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/33178 third-party-advisoryx_refsource_SECUNIA
- http://secunia.com/advisories/35074 third-party-advisoryx_refsource_SECUNIA
- http://security.gentoo.org/glsa/glsa-200812-17.xml vendor-advisoryx_refsource_GENTOO
- http://support.apple.com/kb/HT3549 x_refsource_CONFIRM
- http://support.avaya.com/elmodocs2/security/ASA-2008-424.htm x_refsource_CONFIRM
- http://wiki.rpath.com/wiki/Advisories:rPSA-2008-0264 x_refsource_CONFIRM
- http://www.debian.org/security/2008/dsa-1651 vendor-advisoryx_refsource_DEBIAN
- http://www.debian.org/security/2008/dsa-1652 vendor-advisoryx_refsource_DEBIAN
- http://www.redhat.com/support/errata/RHSA-2008-0897.html vendor-advisoryx_refsource_REDHAT
- http://www.ruby-lang.org/en/news/2008/08/08/multiple-vulnerabilities-in-ruby/ x_refsource_CONFIRMExploit
- http://www.securityfocus.com/archive/1/495884/100/0/threaded mailing-listx_refsource_BUGTRAQ
- http://www.securityfocus.com/bid/30644 vdb-entryx_refsource_BID
- http://www.securitytracker.com/id?1020654 vdb-entryx_refsource_SECTRACK
- http://www.us-cert.gov/cas/techalerts/TA09-133A.html third-party-advisoryx_refsource_CERTUS Government Resource
- http://www.vupen.com/english/advisories/2008/2334 vdb-entryx_refsource_VUPEN
- http://www.vupen.com/english/advisories/2009/1297 vdb-entryx_refsource_VUPEN
- https://access.redhat.com/security/cve/CVE-2008-3656 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=458953 Issue Tracking
- https://exchange.xforce.ibmcloud.com/vulnerabilities/44371 vdb-entryx_refsource_XF
- https://nvd.nist.gov/vuln/detail/CVE-2008-3656
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9682 vdb-entrysignaturex_refsource_OVAL
- https://usn.ubuntu.com/651-1/ vendor-advisoryx_refsource_UBUNTU
- https://www.cve.org/CVERecord?id=CVE-2008-3656
- https://www.redhat.com/archives/fedora-package-announce/2008-October/msg00259.html vendor-advisoryx_refsource_FEDORA
- https://www.redhat.com/archives/fedora-package-announce/2008-October/msg00299.html vendor-advisoryx_refsource_FEDORA
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Aug 13, 2008
Updated Aug 7, 2024
Reserved Aug 12, 2008
Link CVE-2008-3656
CISA Vulnrichment
Updated n/a