The updatePosition function in lib/xmltok_impl.c in libexpat in Expat 2.0.1, as used in Python, PyXML, w3c-libwww, and other software,…

Description

The updatePosition function in lib/xmltok_impl.c in libexpat in Expat 2.0.1, as used in Python, PyXML, w3c-libwww, and other software, allows context-dependent attackers to cause a denial of service (application crash) via an XML document with crafted UTF-8 sequences that trigger a buffer over-read, a different vulnerability than CVE-2009-2625.

Scores

EPSS (exploitation in 30 days)

27.9% · top 1.9% of all CVEs (5 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.0.

Weakness

• n/a

Affected products

• n/a

  • affected n/a

References (93)

• SSA:2011-041-02 (opens in a new tab)vendor-advisoryx_refsource_SLACKWAREx_transferred
• http://svn.python.org/view?view=rev&revision=74429 (opens in a new tab)x_refsource_CONFIRMx_transferred
• MDVSA-2009:215 (opens in a new tab)vendor-advisoryx_refsource_MANDRIVAx_transferred
• FEDORA-2010-17807 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• FEDORA-2009-12753 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• FEDORA-2009-12690 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• 38832 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• RHSA-2010:0002 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• MDVSA-2009:216 (opens in a new tab)vendor-advisoryx_refsource_MANDRIVAx_transferred
• USN-890-1 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
• http://expat.cvs.sourceforge.net/viewvc/expat/expat/lib/xmltok_impl.c?r1=1.13&r2=1.15&view=patch (opens in a new tab)x_refsource_CONFIRMx_transferred
• http://expat.cvs.sourceforge.net/viewvc/expat/expat/lib/xmltok_impl.c?view=log (opens in a new tab)x_refsource_CONFIRMx_transferred
• SUSE-SR:2009:018 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
• [oss-security] 20091022 Re: Regarding expat bug 1990430 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• MDVSA-2009:220 (opens in a new tab)vendor-advisoryx_refsource_MANDRIVAx_transferred
• [expat-bugs] 20090117 [ expat-Bugs-1990430 ] Parser crash with specially formatted UTF-8 sequences (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• 38794 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• [security-announce] 20100303 VMSA-2010-0004 ESX Service Console and vMA third party updates (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• oval:org.mitre.oval:def:11019 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
• ADV-2010-1107 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
• MDVSA-2009:211 (opens in a new tab)vendor-advisoryx_refsource_MANDRIVAx_transferred
• [oss-security] 20090826 Re: Re: expat bug 1990430 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• 41701 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• SUSE-SR:2010:011 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
• [oss-security] 20090821 expat bug 1990430 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• 37925 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• 38050 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• 1023160 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
• SUSE-SR:2010:013 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
• oval:org.mitre.oval:def:7112 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
• https://bugzilla.redhat.com/show_bug.cgi?id=531697 (opens in a new tab)x_refsource_CONFIRMx_transferred
• FEDORA-2010-17720 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• [oss-security] 20091022 Re: Re: Regarding expat bug 1990430 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• USN-890-6 (opens in a new tab)vendor-advisoryx_refsource_UBUNTUx_transferred
• [oss-security] 20091026 Re: CVE Request -- expat [was: Re: Regarding expat bug 1990430] (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• FEDORA-2010-17732 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• [oss-security] 20090826 Re: expat bug 1990430 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• 42338 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• https://bugs.gentoo.org/show_bug.cgi?id=280615 (opens in a new tab)x_refsource_CONFIRMx_transferred
• FEDORA-2009-12737 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• 38231 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• ADV-2010-3053 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
• [oss-security] 20091028 Re: CVE Request -- expat [was: Re: Regarding expat bug 1990430] (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• FEDORA-2010-17762 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• SUSE-SR:2010:012 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
• MDVSA-2009:212 (opens in a new tab)vendor-advisoryx_refsource_MANDRIVAx_transferred
• MDVSA-2009:218 (opens in a new tab)vendor-advisoryx_refsource_MANDRIVAx_transferred
• 38834 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• ADV-2010-3061 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
• http://sourceforge.net/tracker/index.php?func=detail&aid=1990430&group_id=10127&atid=110127 (opens in a new tab)x_refsource_MISCx_transferred
• 39478 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• SUSE-SR:2010:014 (opens in a new tab)vendor-advisoryx_refsource_SUSEx_transferred
• 37537 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• [oss-security] 20091022 Regarding expat bug 1990430 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• oval:org.mitre.oval:def:12719 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
• 43300 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• RHSA-2011:0896 (opens in a new tab)vendor-advisoryx_refsource_REDHATx_transferred
• ADV-2010-0896 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
• 273630 (opens in a new tab)vendor-advisoryx_refsource_SUNALERTx_transferred
• HPSBUX02645 (opens in a new tab)vendor-advisoryx_refsource_HPx_transferred
• [oss-security] 20090827 Re: Re: expat bug 1990430 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• FEDORA-2010-17819 (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• [oss-security] 20090906 Re: Re: expat bug 1990430 (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [oss-security] 20091023 Re: CVE Request -- expat [was: Re: Regarding expat bug 1990430] (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• ADV-2011-0359 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
• MDVSA-2009:219 (opens in a new tab)vendor-advisoryx_refsource_MANDRIVAx_transferred
• ADV-2010-3035 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
• MDVSA-2009:217 (opens in a new tab)vendor-advisoryx_refsource_MANDRIVAx_transferred
• 37324 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• 42326 (opens in a new tab)third-party-advisoryx_refsource_SECUNIAx_transferred
• ADV-2010-0528 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
• [httpd-cvs] 20190815 svn commit: r1048742 [2/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20190815 svn commit: r1048743 [2/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20190815 svn commit: r1048743 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20190815 svn commit: r1048742 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20200401 svn commit: r1058586 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20200401 svn commit: r1058586 [2/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20200401 svn commit: r1058587 [2/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20200401 svn commit: r1058587 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/vulnerabilities-httpd.xml security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073139 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1888194 [6/13] - /httpd/site/trunk/content/security/json/ (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073140 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073139 [6/13] - in /websites/staging/httpd/trunk/content: ./ security/json/ (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073140 [2/4] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073143 [2/3] - in /websites/staging/httpd/trunk/content: ./ security/ (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073149 [7/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073146 [2/3] - in /websites/staging/httpd/trunk/content: ./ security/cvejsontohtml.py security/vulnerabilities-httpd.xml security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210330 svn commit: r1073149 [1/13] - in /websites/staging/httpd/trunk/content: ./ security/ security/json/ (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210603 svn commit: r1075360 [2/3] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210603 svn commit: r1075360 [1/3] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210606 svn commit: r1075467 [2/2] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210606 svn commit: r1075467 [1/2] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2021-31618.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• [httpd-cvs] 20210606 svn commit: r1075470 [3/4] - in /websites/staging/httpd/trunk/content: ./ security/json/CVE-2020-13938.json security/vulnerabilities_13.html security/vulnerabilities_20.html security/vulnerabilities_22.html security/vulnerabilities_24.html (opens in a new tab)mailing-listx_refsource_MLISTx_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-2009-3720](https://trackcve.app/badge/CVE-2009-3720.svg)](https://trackcve.app/cve/CVE-2009-3720)

Record last updated 7 Aug 2024, 06:38 UTC.