Algorithmic complexity vulnerability in the WEBrick::HTTPUtils.split_header_value function in WEBrick::HTTP::DefaultFileHandler in WEBrick…

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.

Scores

EPSS (exploitation in 30 days)

70.2% · top 0.6% of all CVEs (5 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.

Weakness

• n/a
• CWE-399 (opens in a new tab)All about CWE-399 and its CVEs

Affected products

• n/a

  • affected n/a

References (30)

• oval:org.mitre.oval:def:9682 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
• 31430 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• 31697 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• USN-651-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
• ruby-webrick-dos(44371) (opens in a new tab)vdb-entryx_refsource_XFx_transferred
• http://support.apple.com/kb/HT3549 (opens in a new tab)x_refsource_CONFIRMx_transferred
• http://wiki.rpath.com/wiki/Advisories:rPSA-2008-0264 (opens in a new tab)x_refsource_CONFIRMx_transferred
• DSA-1652 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
• FEDORA-2008-8736 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• 35074 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• http://support.avaya.com/elmodocs2/security/ASA-2008-424.htm (opens in a new tab)x_refsource_CONFIRMx_transferred
• DSA-1651 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
• APPLE-SA-2009-05-12 (opens in a new tab)vendor-advisoryx_refsource_APPLEx_transferred
• 30644 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
• RHSA-2008:0897 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• http://www.ruby-lang.org/en/news/2008/08/08/multiple-vulnerabilities-in-ruby/ (opens in a new tab)x_refsource_CONFIRMx_transferred
• 32219 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• 1020654 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
• TA09-133A (opens in a new tab)third-party-advisoryx_refsource_CERTx_transferred
• 32255 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• ADV-2009-1297 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
• 20080831 rPSA-2008-0264-1 ruby (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
• 32371 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• 32165 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• GLSA-200812-17 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
• 33178 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• ADV-2008-2334 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
• FEDORA-2008-8738 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=494401 (opens in a new tab)x_refsource_CONFIRMx_transferred
• 32256 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2008-3656](https://trackcve.app/badge/CVE-2008-3656.svg)](https://trackcve.app/cve/CVE-2008-3656)

Record last updated 7 Aug 2024, 09:45 UTC.