High 7.5Published Jun 7, 2009

CVE-2009-1955The expat XML parser in the apr_xml_* interface in xml/apr_xml.c in Apache APR-util before 1.3.7, as used in the mod_dav and mod_dav_svn modules in the Apache HTTP Server, allows remote attackers to…

Updated under an hour ago (Nov 2, 2026, 1:40 AM ET)

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It affects apache apr-util and 7 other products. Add what you run to find out whether that includes you.

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The expat XML parser in the apr_xml_* interface in xml/apr_xml.c in Apache APR-util before 1.3.7, as used in the mod_dav and mod_dav_svn modules in the Apache HTTP Server, allows remote attackers to cause a denial of service (memory consumption) via a crafted XML document containing a large number of nested entity references, as demonstrated by a PROPFIND request, a similar issue to CVE-2003-1564.

CVSS: 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-776
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 16, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

apache apr-util apache:apr-util	before 1.3.7	NVD
apple mac_os_x apple:mac_os_x	before 10.6.2	NVD
suse linux_enterprise_server suse:linux_enterprise_server	9	NVD
debian debian_linux debian:debian_linux	4.0	NVD
canonical ubuntu_linux canonical:ubuntu_linux	6.06; 8.04; 8.10; 9.04	NVD
fedoraproject fedora fedoraproject:fedora	9; 10; 11	NVD
oracle http_server oracle:http_server	all versions	NVD
apache http_server apache:http_server	from 2.2.0 before 2.2.12	NVD

References

References

http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html	mailing-list, third-party-advisory
http://lists.opensuse.org/opensuse-security-announce/2010-05/msg00001.html	mailing-list, third-party-advisory
http://marc.info/?l=apr-dev&m=124396021826125&w=2	mailing-list, patch
http://marc.info/?l=bugtraq&m=129190899612998&w=2	mailing-list
http://secunia.com/advisories/34724	broken-link, third-party-advisory
http://secunia.com/advisories/35284	broken-link, third-party-advisory
http://secunia.com/advisories/35360	broken-link, third-party-advisory
http://secunia.com/advisories/35395	broken-link, third-party-advisory
http://secunia.com/advisories/35444	broken-link, third-party-advisory
http://secunia.com/advisories/35487	broken-link, third-party-advisory
1–10 of 25

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.