Unrated severityNVD Advisory· Published Nov 3, 2009· Updated Jun 16, 2026
CVE-2009-3720
CVE-2009-3720
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
6cpe:2.3:a:libexpat_project:libexpat:2.0.1:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:libexpat_project:libexpat:2.0.1:*:*:*:*:*:*:*
- (no CPE)range: <=2.0.1
- osv-coords3 versionspkg:rpm/opensuse/apache2&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/apr-util&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/expat&distro=openSUSE%20Tumbleweed
< 2.4.23-4.1+ 2 more
- (no CPE)range: < 2.4.23-4.1
- (no CPE)range: < 1.5.4-4.4
- (no CPE)range: < 2.2.0-3.1
Patches
Vulnerability mechanics
References
93- expat.cvs.sourceforge.net/viewvc/expat/expat/lib/xmltok_impl.cnvdExploit
- expat.cvs.sourceforge.net/viewvc/expat/expat/lib/xmltok_impl.cnvdMailing ListThird Party Advisory
- lists.fedoraproject.org/pipermail/package-announce/2010-November/051228.htmlnvdThird Party Advisory
- lists.fedoraproject.org/pipermail/package-announce/2010-November/051247.htmlnvdMailing ListThird Party Advisory
- lists.fedoraproject.org/pipermail/package-announce/2010-November/051367.htmlnvdThird Party Advisory
- lists.fedoraproject.org/pipermail/package-announce/2010-November/051405.htmlnvdThird Party Advisory
- lists.fedoraproject.org/pipermail/package-announce/2010-November/051442.htmlnvdThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2009-11/msg00004.htmlnvdThird Party Advisory
- lists.opensuse.org/opensuse-security-announce/2010-05/msg00001.htmlnvdThird Party AdvisoryVDB Entry
- lists.opensuse.org/opensuse-security-announce/2010-05/msg00002.htmlnvdThird Party AdvisoryVDB Entry
- lists.opensuse.org/opensuse-security-announce/2010-06/msg00001.htmlnvdThird Party AdvisoryVDB Entry
- lists.opensuse.org/opensuse-security-announce/2010-08/msg00001.htmlnvdThird Party AdvisoryVDB Entry
- mail.python.org/pipermail/expat-bugs/2009-January/002781.htmlnvdThird Party Advisory
- marc.infonvdMailing ListThird Party Advisory
- slackware.com/security/viewer.phpnvdMailing ListThird Party Advisory
- sourceforge.net/tracker/index.phpnvdMailing ListThird Party Advisory
- svn.python.org/viewnvdPermissions RequiredThird Party Advisory
- www.mandriva.com/security/advisoriesnvdPermissions RequiredThird Party Advisory
- www.securitytracker.com/idnvdThird Party AdvisoryVDB Entry
- www.ubuntu.com/usn/USN-890-1nvdThird Party Advisory
- www.ubuntu.com/usn/USN-890-6nvdThird Party Advisory
- bugs.gentoo.org/show_bug.cginvdThird Party Advisory
- lists.apache.org/thread.html/54a42d4b01968df1117cea77fc53d6beb931c0e05936ad02af93e9ac%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/5df9bfb86a3b054bb985a45ff9250b0332c9ecc181eec232489e7f79%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/r0276683d8e1e07153fc8642618830ac0ade85b9ae0dc7b07f63bb8fc%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/r2295080a257bad27ea68ca0af12fc715577f9e84801eae116a33107e%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/r2cb985de917e7da0848c440535f65a247754db8b2154a10089e4247b%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/r476d175be0aaf4a17680ef98c5153b4d336eaef76fb2224cc94c463a%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/r5f9c22f9c28adbd9f00556059edc7b03a5d5bb71d4bb80257c0d34e4%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/r8828e649175df56f1f9e3919938ac7826128525426e2748f0ab62feb%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/r9e8622254184645bc963a1d47c5d47f6d5a36d6f080d8d2c43b2b142%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/rad01d817195e6cc871cb1d73b207ca326379a20a6e7f30febaf56d24%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/rad2acee3ab838b52c04a0698b1728a9a43467bf365bd481c993c535d%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/rb9c9f42dafa25d2f669dac2a536a03f2575bc5ec1be6f480618aee10%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/reb7c64aeea604bf948467d9d1cab8ff23fa7d002be1964bcc275aae7%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3EnvdThird Party Advisory
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7112nvdMailing ListThird Party Advisory
- www.redhat.com/archives/fedora-package-announce/2009-December/msg00370.htmlnvdThird Party Advisory
- www.redhat.com/archives/fedora-package-announce/2009-December/msg00413.htmlnvdThird Party Advisory
- www.redhat.com/archives/fedora-package-announce/2009-December/msg01274.htmlnvdThird Party Advisory
- lists.vmware.com/pipermail/security-announce/2010/000082.htmlnvdBroken Link
- secunia.com/advisories/37324nvdBroken Link
- secunia.com/advisories/37537nvdBroken Link
- secunia.com/advisories/37925nvdBroken Link
- secunia.com/advisories/38050nvdBroken Link
- secunia.com/advisories/38231nvdBroken Link
- secunia.com/advisories/38794nvdBroken Link
- secunia.com/advisories/38832nvdBroken Link
- secunia.com/advisories/38834nvdBroken Link
- secunia.com/advisories/39478nvdBroken Link
- secunia.com/advisories/41701nvdBroken Link
- secunia.com/advisories/42326nvdBroken Link
- secunia.com/advisories/42338nvdBroken Link
- secunia.com/advisories/43300nvdBroken Link
- sunsolve.sun.com/search/document.donvdBroken Link
- www.mandriva.com/security/advisoriesnvdBroken Link
- www.mandriva.com/security/advisoriesnvdBroken Link
- www.mandriva.com/security/advisoriesnvdBroken Link
- www.mandriva.com/security/advisoriesnvdBroken Link
- www.mandriva.com/security/advisoriesnvdBroken Link
- www.mandriva.com/security/advisoriesnvdBroken Link
- www.mandriva.com/security/advisoriesnvdBroken Link
- www.openwall.com/lists/oss-security/2009/08/21/2nvdMailing List
- www.openwall.com/lists/oss-security/2009/08/26/3nvdMailing List
- www.openwall.com/lists/oss-security/2009/08/26/4nvdMailing List
- www.openwall.com/lists/oss-security/2009/08/27/6nvdMailing List
- www.openwall.com/lists/oss-security/2009/09/06/1nvdMailing List
- www.openwall.com/lists/oss-security/2009/10/22/5nvdMailing List
- www.openwall.com/lists/oss-security/2009/10/22/9nvdMailing List
- www.openwall.com/lists/oss-security/2009/10/23/2nvdMailing List
- www.openwall.com/lists/oss-security/2009/10/23/6nvdMailing List
- www.openwall.com/lists/oss-security/2009/10/26/3nvdMailing List
- www.openwall.com/lists/oss-security/2009/10/28/3nvdMailing List
- www.redhat.com/support/errata/RHSA-2010-0002.htmlnvdBroken Link
- www.redhat.com/support/errata/RHSA-2011-0896.htmlnvdBroken Link
- www.vupen.com/english/advisories/2010/0528nvdBroken Link
- www.vupen.com/english/advisories/2010/0896nvdBroken Link
- www.vupen.com/english/advisories/2010/1107nvdBroken Link
- www.vupen.com/english/advisories/2010/3035nvdBroken Link
- www.vupen.com/english/advisories/2010/3053nvdBroken Link
- www.vupen.com/english/advisories/2010/3061nvdBroken Link
- www.vupen.com/english/advisories/2011/0359nvdBroken Link
- bugzilla.redhat.com/show_bug.cginvdIssue Tracking
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11019nvdBroken Link
- oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12719nvdBroken Link
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