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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 …

Info
CVECVE-2009-3720
First seen2026-07-20 15:15 UTC
Disclosed2009-11-03 16:30 UTC
Last updated2026-07-20 15:15 UTC
Channel statusauto

Summary

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.

In-depth triage · Auto channel

No in-depth report has been generated yet (DR-003 v2 AI pipeline is under construction).

Affected products

  • :
  • :
Lint boundary warnings (86)

The following non-blocking warnings were raised during the lint phase of this triage (e.g. reference URLs not yet on the allowlist). They do not affect entry usability and are disclosed for transparency (see DR-002).

  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://expat.cvs.sourceforge.net/viewvc/expat/expat/lib/xmltok_impl.c?r1=1.13&r2=1.15&view=patch
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://expat.cvs.sourceforge.net/viewvc/expat/expat/lib/xmltok_impl.c?view=log
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://lists.opensuse.org/opensuse-security-announce/2009-11/msg00004.html
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://lists.opensuse.org/opensuse-security-announce/2010-05/msg00001.html
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://lists.opensuse.org/opensuse-security-announce/2010-05/msg00002.html
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://lists.opensuse.org/opensuse-security-announce/2010-06/msg00001.html
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://lists.opensuse.org/opensuse-security-announce/2010-08/msg00001.html
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://marc.info/?l=bugtraq&m=130168502603566&w=2
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/37324
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/37537
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/37925
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/38050
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/38231
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/38794
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/38832
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/38834
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/39478
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/41701
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/42326
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/42338
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/43300
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://slackware.com/security/viewer.php?l=slackware-security&y=2011&m=slackware-security.486026
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://sourceforge.net/tracker/index.php?func=detail&aid=1990430&group_id=10127&atid=110127
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://sunsolve.sun.com/search/document.do?assetkey=1-66-273630-1
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.mandriva.com/security/advisories?name=MDVSA-2009:211
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.mandriva.com/security/advisories?name=MDVSA-2009:212
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.mandriva.com/security/advisories?name=MDVSA-2009:215
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.mandriva.com/security/advisories?name=MDVSA-2009:216
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.mandriva.com/security/advisories?name=MDVSA-2009:217
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.mandriva.com/security/advisories?name=MDVSA-2009:218
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.mandriva.com/security/advisories?name=MDVSA-2009:219
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.mandriva.com/security/advisories?name=MDVSA-2009:220
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.securitytracker.com/id?1023160
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.vupen.com/english/advisories/2010/0528
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.vupen.com/english/advisories/2010/0896
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.vupen.com/english/advisories/2010/1107
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.vupen.com/english/advisories/2010/3035
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.vupen.com/english/advisories/2010/3053
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.vupen.com/english/advisories/2010/3061
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.vupen.com/english/advisories/2011/0359
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11019
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12719
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7112
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://expat.cvs.sourceforge.net/viewvc/expat/expat/lib/xmltok_impl.c?r1=1.13&r2=1.15&view=patch
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://expat.cvs.sourceforge.net/viewvc/expat/expat/lib/xmltok_impl.c?view=log
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://lists.opensuse.org/opensuse-security-announce/2009-11/msg00004.html
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://lists.opensuse.org/opensuse-security-announce/2010-05/msg00001.html
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://lists.opensuse.org/opensuse-security-announce/2010-05/msg00002.html
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://lists.opensuse.org/opensuse-security-announce/2010-06/msg00001.html
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://lists.opensuse.org/opensuse-security-announce/2010-08/msg00001.html
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://marc.info/?l=bugtraq&m=130168502603566&w=2
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/37324
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/37537
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/37925
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/38050
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/38231
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/38794
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/38832
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/38834
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/39478
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/41701
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/42326
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/42338
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://secunia.com/advisories/43300
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://slackware.com/security/viewer.php?l=slackware-security&y=2011&m=slackware-security.486026
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://sourceforge.net/tracker/index.php?func=detail&aid=1990430&group_id=10127&atid=110127
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://sunsolve.sun.com/search/document.do?assetkey=1-66-273630-1
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.mandriva.com/security/advisories?name=MDVSA-2009:211
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.mandriva.com/security/advisories?name=MDVSA-2009:212
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.mandriva.com/security/advisories?name=MDVSA-2009:215
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.mandriva.com/security/advisories?name=MDVSA-2009:216
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.mandriva.com/security/advisories?name=MDVSA-2009:217
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.mandriva.com/security/advisories?name=MDVSA-2009:218
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.mandriva.com/security/advisories?name=MDVSA-2009:219
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.mandriva.com/security/advisories?name=MDVSA-2009:220
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.securitytracker.com/id?1023160
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.vupen.com/english/advisories/2010/0528
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.vupen.com/english/advisories/2010/0896
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.vupen.com/english/advisories/2010/1107
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.vupen.com/english/advisories/2010/3035
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.vupen.com/english/advisories/2010/3053
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.vupen.com/english/advisories/2010/3061
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: http://www.vupen.com/english/advisories/2011/0359
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11019
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12719
  • REF_URL_NOT_ALLOWLISTED url not in allowlist: https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7112

Sources

  • NVD DATABASE

Original Links

Timeline

  1. nvd_ingest NVD