CVE-2009-1891

The mod_deflate module in Apache httpd 2.2.11 and earlier compresses large files until completion...

7.1 HighFix available

The mod_deflate module in Apache httpd 2.2.11 and earlier compresses large files until completion even after the associated network connection is closed, which allows remote attackers to cause a denial of service (CPU consumption).

Exploit likelihood

17.1%Up 9.8 points since Feb 4, 2022

What each source reports

NVD Score used 7.1

Record: CVE-2009-1891
CVSS 2.0: 7.1 HighAV:N/AC:M/Au:N/C:N/I:N/A:C
Weakness: CWE-400
Updated: 2026-11-02

CVE List No score

Record: CVE-2009-1891
Updated: 2026-11-02

EUVDEUVD-2009-1886 No score

Record: EUVD-2009-1886
Updated: 2026-11-03

GitHub AdvisoriesGHSA-hwvh-jv6j-6p3p No score

The mod_deflate module in Apache httpd 2.2.11 and earlier compresses large files until completion...

Record: GHSA-hwvh-jv6j-6p3p
Weakness: CWE-400
Updated: 2026-11-02

OSV No score

Record: CVE-2009-1891
Updated: 2026-11-02

OSVDEBIAN-CVE-2009-1891 No score

Record: DEBIAN-CVE-2009-1891
Updated: 2026-11-02

OSVopenSUSE-SU-2024:10268-1 No score

apache2-2.4.23-4.1 on GA media

These are all security issues fixed in the apache2-2.4.23-4.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2024:10268-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`apache2` Debian:12	before 2.2.11-7	2.2.11-7
`apache2` Debian:13	before 2.2.11-7	2.2.11-7
`apache2` Debian:14	before 2.2.11-7	2.2.11-7
`apache2` Debian:4.0	before 2.2.3-4+etch9, plus listed versions 2.2.3-42.2.3-4+etch12.2.3-4+etch22.2.3-4+etch32.2.3-4+etch42.2.3-4+etch52.2.3-4+etch62.2.3-4+etch8	2.2.3-4+etch9
`apache2` Debian:5.0	before 2.2.9-10+lenny4, plus listed versions 2.2.9-10+lenny22.2.9-10+lenny3	2.2.9-10+lenny4
`httpd` Red Hat:enterprise_linux:5::client_workstation	before 0:2.2.3-22.el5_3.2	0:2.2.3-22.el5_3.2
`httpd-debuginfo` Red Hat:enterprise_linux:5::client_workstation	before 0:2.2.3-22.el5_3.2	0:2.2.3-22.el5_3.2
`httpd-devel` Red Hat:enterprise_linux:5::client_workstation	before 0:2.2.3-22.el5_3.2	0:2.2.3-22.el5_3.2
`httpd-manual` Red Hat:enterprise_linux:5::client_workstation	before 0:2.2.3-22.el5_3.2	0:2.2.3-22.el5_3.2
`httpd` Red Hat:enterprise_linux:5::client	before 0:2.2.3-22.el5_3.2	0:2.2.3-22.el5_3.2

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Affected packages
Package	Affected	Fixed
`httpd-debuginfo` Red Hat:enterprise_linux:5::client	before 0:2.2.3-22.el5_3.2	0:2.2.3-22.el5_3.2
`mod_ssl` Red Hat:enterprise_linux:5::client	before 1:2.2.3-22.el5_3.2	1:2.2.3-22.el5_3.2
`httpd` Red Hat:enterprise_linux:5::server	before 0:2.2.3-22.el5_3.2	0:2.2.3-22.el5_3.2
`httpd-debuginfo` Red Hat:enterprise_linux:5::server	before 0:2.2.3-22.el5_3.2	0:2.2.3-22.el5_3.2
`httpd-devel` Red Hat:enterprise_linux:5::server	before 0:2.2.3-22.el5_3.2	0:2.2.3-22.el5_3.2
`httpd-manual` Red Hat:enterprise_linux:5::server	before 0:2.2.3-22.el5_3.2	0:2.2.3-22.el5_3.2
`mod_ssl` Red Hat:enterprise_linux:5::server	before 1:2.2.3-22.el5_3.2	1:2.2.3-22.el5_3.2
`httpd` Red Hat:jboss_enterprise_web_server:1::el5	before 0:2.2.10-10.ep5.el5	0:2.2.10-10.ep5.el5
`httpd-devel` Red Hat:jboss_enterprise_web_server:1::el5	before 0:2.2.10-10.ep5.el5	0:2.2.10-10.ep5.el5
`httpd-manual` Red Hat:jboss_enterprise_web_server:1::el5	before 0:2.2.10-10.ep5.el5	0:2.2.10-10.ep5.el5
`mod_ssl` Red Hat:jboss_enterprise_web_server:1::el5	before 1:2.2.10-10.ep5.el5	1:2.2.10-10.ep5.el5
`httpd` Red Hat:rhel_application_stack:2	before 0:2.2.11-3.el5s2	0:2.2.11-3.el5s2
`httpd-debuginfo` Red Hat:rhel_application_stack:2	before 0:2.2.11-3.el5s2	0:2.2.11-3.el5s2
`httpd-devel` Red Hat:rhel_application_stack:2	before 0:2.2.11-3.el5s2	0:2.2.11-3.el5s2
`httpd-manual` Red Hat:rhel_application_stack:2	before 0:2.2.11-3.el5s2	0:2.2.11-3.el5s2
`mod_ssl` Red Hat:rhel_application_stack:2	before 1:2.2.11-3.el5s2	1:2.2.11-3.el5s2
`httpd22` Red Hat:jboss_enterprise_web_server:1::el4	before 0:2.2.10-23.1.ep5.el4	0:2.2.10-23.1.ep5.el4
`httpd22-apr` Red Hat:jboss_enterprise_web_server:1::el4	before 0:2.2.10-23.1.ep5.el4	0:2.2.10-23.1.ep5.el4
`httpd22-apr-devel` Red Hat:jboss_enterprise_web_server:1::el4	before 0:2.2.10-23.1.ep5.el4	0:2.2.10-23.1.ep5.el4
`httpd22-apr-util` Red Hat:jboss_enterprise_web_server:1::el4	before 0:2.2.10-23.1.ep5.el4	0:2.2.10-23.1.ep5.el4
`httpd22-apr-util-devel` Red Hat:jboss_enterprise_web_server:1::el4	before 0:2.2.10-23.1.ep5.el4	0:2.2.10-23.1.ep5.el4
`httpd22-debuginfo` Red Hat:jboss_enterprise_web_server:1::el4	before 0:2.2.10-23.1.ep5.el4	0:2.2.10-23.1.ep5.el4
`httpd22-devel` Red Hat:jboss_enterprise_web_server:1::el4	before 0:2.2.10-23.1.ep5.el4	0:2.2.10-23.1.ep5.el4
`mod_ssl22` Red Hat:jboss_enterprise_web_server:1::el4	before 1:2.2.10-23.1.ep5.el4	1:2.2.10-23.1.ep5.el4
`httpd` Red Hat:enterprise_linux:3::as	before 0:2.0.46-75.ent	0:2.0.46-75.ent
`httpd-debuginfo` Red Hat:enterprise_linux:3::as	before 0:2.0.46-75.ent	0:2.0.46-75.ent
`httpd-devel` Red Hat:enterprise_linux:3::as	before 0:2.0.46-75.ent	0:2.0.46-75.ent
`mod_ssl` Red Hat:enterprise_linux:3::as	before 1:2.0.46-75.ent	1:2.0.46-75.ent
`httpd` Red Hat:enterprise_linux:3::desktop	before 0:2.0.46-75.ent	0:2.0.46-75.ent
`httpd-debuginfo` Red Hat:enterprise_linux:3::desktop	before 0:2.0.46-75.ent	0:2.0.46-75.ent
`httpd-devel` Red Hat:enterprise_linux:3::desktop	before 0:2.0.46-75.ent	0:2.0.46-75.ent
`mod_ssl` Red Hat:enterprise_linux:3::desktop	before 1:2.0.46-75.ent	1:2.0.46-75.ent
`httpd` Red Hat:enterprise_linux:3::es	before 0:2.0.46-75.ent	0:2.0.46-75.ent
`httpd-debuginfo` Red Hat:enterprise_linux:3::es	before 0:2.0.46-75.ent	0:2.0.46-75.ent
`httpd-devel` Red Hat:enterprise_linux:3::es	before 0:2.0.46-75.ent	0:2.0.46-75.ent
`mod_ssl` Red Hat:enterprise_linux:3::es	before 1:2.0.46-75.ent	1:2.0.46-75.ent
`httpd` Red Hat:enterprise_linux:3::ws	before 0:2.0.46-75.ent	0:2.0.46-75.ent
`httpd-debuginfo` Red Hat:enterprise_linux:3::ws	before 0:2.0.46-75.ent	0:2.0.46-75.ent
`httpd-devel` Red Hat:enterprise_linux:3::ws	before 0:2.0.46-75.ent	0:2.0.46-75.ent
`mod_ssl` Red Hat:enterprise_linux:3::ws	before 1:2.0.46-75.ent	1:2.0.46-75.ent
`httpd` Red Hat:enterprise_linux:4::as	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`httpd-debuginfo` Red Hat:enterprise_linux:4::as	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`httpd-devel` Red Hat:enterprise_linux:4::as	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`httpd-manual` Red Hat:enterprise_linux:4::as	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`httpd-suexec` Red Hat:enterprise_linux:4::as	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`mod_ssl` Red Hat:enterprise_linux:4::as	before 1:2.0.52-41.ent.6	1:2.0.52-41.ent.6
`httpd` Red Hat:enterprise_linux:4::desktop	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`httpd-debuginfo` Red Hat:enterprise_linux:4::desktop	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`httpd-devel` Red Hat:enterprise_linux:4::desktop	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`httpd-manual` Red Hat:enterprise_linux:4::desktop	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`httpd-suexec` Red Hat:enterprise_linux:4::desktop	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`mod_ssl` Red Hat:enterprise_linux:4::desktop	before 1:2.0.52-41.ent.6	1:2.0.52-41.ent.6
`httpd` Red Hat:enterprise_linux:4::es	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`httpd-debuginfo` Red Hat:enterprise_linux:4::es	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`httpd-devel` Red Hat:enterprise_linux:4::es	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`httpd-manual` Red Hat:enterprise_linux:4::es	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`httpd-suexec` Red Hat:enterprise_linux:4::es	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`mod_ssl` Red Hat:enterprise_linux:4::es	before 1:2.0.52-41.ent.6	1:2.0.52-41.ent.6
`httpd` Red Hat:enterprise_linux:4::ws	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`httpd-debuginfo` Red Hat:enterprise_linux:4::ws	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`httpd-devel` Red Hat:enterprise_linux:4::ws	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`httpd-manual` Red Hat:enterprise_linux:4::ws	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`httpd-suexec` Red Hat:enterprise_linux:4::ws	before 0:2.0.52-41.ent.6	0:2.0.52-41.ent.6
`mod_ssl` Red Hat:enterprise_linux:4::ws	before 1:2.0.52-41.ent.6	1:2.0.52-41.ent.6
`ant` Red Hat:certificate_system:7.3	before 0:1.6.5-1jpp_1rh	0:1.6.5-1jpp_1rh
`avalon-logkit` Red Hat:certificate_system:7.3	before 0:1.2-2jpp_4rh	0:1.2-2jpp_4rh
`axis` Red Hat:certificate_system:7.3	before 0:1.2.1-1jpp_3rh	0:1.2.1-1jpp_3rh
`classpathx-jaf` Red Hat:certificate_system:7.3	before 0:1.0-2jpp_6rh	0:1.0-2jpp_6rh
`classpathx-mail` Red Hat:certificate_system:7.3	before 0:1.1.1-2jpp_8rh	0:1.1.1-2jpp_8rh
`geronimo-ejb-2.1-api` Red Hat:certificate_system:7.3	before 0:1.0-0.M4.1jpp_10rh	0:1.0-0.M4.1jpp_10rh
`geronimo-j2ee-1.4-apis` Red Hat:certificate_system:7.3	before 0:1.0-0.M4.1jpp_10rh	0:1.0-0.M4.1jpp_10rh
`geronimo-j2ee-connector-1.5-api` Red Hat:certificate_system:7.3	before 0:1.0-0.M4.1jpp_10rh	0:1.0-0.M4.1jpp_10rh
`geronimo-j2ee-deployment-1.1-api` Red Hat:certificate_system:7.3	before 0:1.0-0.M4.1jpp_10rh	0:1.0-0.M4.1jpp_10rh
`geronimo-j2ee-management-1.0-api` Red Hat:certificate_system:7.3	before 0:1.0-0.M4.1jpp_10rh	0:1.0-0.M4.1jpp_10rh
`geronimo-jms-1.1-api` Red Hat:certificate_system:7.3	before 0:1.0-0.M4.1jpp_10rh	0:1.0-0.M4.1jpp_10rh
`geronimo-jsp-2.0-api` Red Hat:certificate_system:7.3	before 0:1.0-0.M4.1jpp_10rh	0:1.0-0.M4.1jpp_10rh
`geronimo-jta-1.0.1B-api` Red Hat:certificate_system:7.3	before 0:1.0-0.M4.1jpp_10rh	0:1.0-0.M4.1jpp_10rh
`geronimo-servlet-2.4-api` Red Hat:certificate_system:7.3	before 0:1.0-0.M4.1jpp_10rh	0:1.0-0.M4.1jpp_10rh
`geronimo-specs` Red Hat:certificate_system:7.3	before 0:1.0-0.M4.1jpp_10rh	0:1.0-0.M4.1jpp_10rh
`geronimo-specs-javadoc` Red Hat:certificate_system:7.3	before 0:1.0-0.M4.1jpp_10rh	0:1.0-0.M4.1jpp_10rh
`jakarta-commons-modeler` Red Hat:certificate_system:7.3	before 0:2.0-3jpp_2rh	0:2.0-3jpp_2rh
`log4j` Red Hat:certificate_system:7.3	before 0:1.2.12-1jpp_1rh	0:1.2.12-1jpp_1rh
`mx4j` Red Hat:certificate_system:7.3	before 1:3.0.1-1jpp_4rh	1:3.0.1-1jpp_4rh
`pcsc-lite` Red Hat:certificate_system:7.3	before 0:1.3.3-3.el4	0:1.3.3-3.el4
`pcsc-lite-debuginfo` Red Hat:certificate_system:7.3	before 0:1.3.3-3.el4	0:1.3.3-3.el4
`pcsc-lite-doc` Red Hat:certificate_system:7.3	before 0:1.3.3-3.el4	0:1.3.3-3.el4
`pcsc-lite-libs` Red Hat:certificate_system:7.3	before 0:1.3.3-3.el4	0:1.3.3-3.el4
`rhpki-ca` Red Hat:certificate_system:7.3	before 0:7.3.0-20.el4	0:7.3.0-20.el4
`rhpki-java-tools` Red Hat:certificate_system:7.3	before 0:7.3.0-10.el4	0:7.3.0-10.el4
`rhpki-kra` Red Hat:certificate_system:7.3	before 0:7.3.0-14.el4	0:7.3.0-14.el4
`rhpki-manage` Red Hat:certificate_system:7.3	before 0:7.3.0-19.el4	0:7.3.0-19.el4
`rhpki-native-tools` Red Hat:certificate_system:7.3	before 0:7.3.0-6.el4	0:7.3.0-6.el4
`rhpki-ocsp` Red Hat:certificate_system:7.3	before 0:7.3.0-13.el4	0:7.3.0-13.el4
`rhpki-tks` Red Hat:certificate_system:7.3	before 0:7.3.0-13.el4	0:7.3.0-13.el4
`tomcat5` Red Hat:certificate_system:7.3	before 0:5.5.23-0jpp_4rh.16	0:5.5.23-0jpp_4rh.16
`tomcat5-common-lib` Red Hat:certificate_system:7.3	before 0:5.5.23-0jpp_4rh.16	0:5.5.23-0jpp_4rh.16
`tomcat5-jasper` Red Hat:certificate_system:7.3	before 0:5.5.23-0jpp_4rh.16	0:5.5.23-0jpp_4rh.16
`tomcat5-jsp-2.0-api` Red Hat:certificate_system:7.3	before 0:5.5.23-0jpp_4rh.16	0:5.5.23-0jpp_4rh.16
`tomcat5-server-lib` Red Hat:certificate_system:7.3	before 0:5.5.23-0jpp_4rh.16	0:5.5.23-0jpp_4rh.16
`tomcat5-servlet-2.4-api` Red Hat:certificate_system:7.3	before 0:5.5.23-0jpp_4rh.16	0:5.5.23-0jpp_4rh.16
`xerces-j2` Red Hat:certificate_system:7.3	before 0:2.7.1-1jpp_1rh	0:2.7.1-1jpp_1rh
`xml-commons` Red Hat:certificate_system:7.3	before 0:1.3.02-2jpp_1rh	0:1.3.02-2jpp_1rh
`xml-commons-apis` Red Hat:certificate_system:7.3	before 0:1.3.02-2jpp_1rh	0:1.3.02-2jpp_1rh
`apache2` openSUSE:Tumbleweed	before 2.4.23-4.1	2.4.23-4.1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2009-1891 is a high vulnerability (CVSS 7.1) in Apache Http Server, published July 10, 2009. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 17.1%, the 97th percentile. Fixed in apache2 2.2.11-7.

References

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