CVE-2026-28780

EUVD-2026-27506
Heap-based Buffer Overflow vulnerability in mod_proxy_ajp of Apache HTTP Server.
If mod_proxy_ajp connects to a malicious AJP server this AJP server can send a malicious AJP message back to mod_proxy_ajp and cause it to write 4 attacker controlled bytes after the end of a heap based buffer.

This issue affects Apache HTTP Server: through 2.4.66.

Users are recommended to upgrade to version 2.4.67, which fixes the issue.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 69.41%
Affected Products (NVD)
VendorProductVersion
apachehttp_server
𝑥
< 2.4.67
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
Red HatJBoss Core Services for RHEL 8
0:2.4.62-13.el8jbcs ≤
𝑥
< *
ADP
Red HatJBoss Core Services on RHEL 7
0:2.4.62-13.el7jbcs ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 10
0:2.4.63-13.el10_2.1 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support
0:2.4.63-1.el10_0.4 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8
8100020260519200905.489197e6 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
8040020260702193120.522a0ee4 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
8040020260702193120.522a0ee4 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
8060020260702195216.ad008a3a ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
8060020260702195216.ad008a3a ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service
8080020260702200145.63b34585 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions
8080020260702200145.63b34585 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9
0:2.4.62-13.el9_8.1 ≤
𝑥
< *
ADP
Debian logo
Debian Releases
Debian Product
Codename
apache2
bookworm
2.4.68-1~deb12u1
fixed
bookworm (security)
2.4.67-1~deb12u3
fixed
bullseye
vulnerable
bullseye (security)
2.4.67-1~deb11u3
fixed
forky
2.4.68-1
fixed
sid
2.4.68-1
fixed
trixie
2.4.68-1~deb13u1
fixed
trixie (security)
2.4.67-1~deb13u3
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
apache2
bionic
Fixed 2.4.29-1ubuntu4.27+esm9
released
focal
Fixed 2.4.41-4ubuntu3.23+esm4
released
jammy
Fixed 2.4.52-1ubuntu4.20
released
noble
Fixed 2.4.58-1ubuntu8.12
released
questing
Fixed 2.4.64-1ubuntu3.4
released
resolute
Fixed 2.4.66-2ubuntu2.1
released
trusty
Fixed 2.4.7-1ubuntu4.22+esm13
released
xenial
Fixed 2.4.18-2ubuntu3.17+esm18
released
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
apache2
suse enterprise desktop 15 SP7
2.4.66-150700.4.20.1
fixed
suse enterprise sap 15 SP4
2.4.66-150400.6.57.1
fixed
suse enterprise sap 15 SP5
2.4.66-150400.6.57.1
fixed
suse enterprise sap 15 SP7
2.4.66-150700.4.20.1
fixed
suse enterprise server 12 SP3
2.4.66-29.131.1
fixed
suse enterprise server 12 SP5
2.4.66-35.78.1
fixed
suse enterprise server 15 SP4
2.4.66-150400.6.57.1
fixed
suse enterprise server 15 SP5
2.4.66-150400.6.57.1
fixed
suse enterprise server 15 SP6
2.4.66-150600.5.52.1
fixed
suse enterprise server 15 SP7
2.4.66-150700.4.20.1
fixed
apache2-devel
suse enterprise sap 15 SP4
2.4.66-150400.6.57.1
fixed
suse enterprise sap 15 SP5
2.4.66-150400.6.57.1
fixed
suse enterprise sap 15 SP7
2.4.66-150700.4.20.1
fixed
suse enterprise server 12 SP5
2.4.66-35.78.1
fixed
suse enterprise server 15 SP4
2.4.66-150400.6.57.1
fixed
suse enterprise server 15 SP5
2.4.66-150400.6.57.1
fixed
suse enterprise server 15 SP6
2.4.66-150600.5.52.1
fixed
suse enterprise server 15 SP7
2.4.66-150700.4.20.1
fixed
apache2-doc
suse enterprise sap 15 SP4
2.4.66-150400.6.57.1
fixed
suse enterprise sap 15 SP5
2.4.66-150400.6.57.1
fixed
suse enterprise server 12 SP3
2.4.66-29.131.1
fixed
suse enterprise server 12 SP5
2.4.66-35.78.1
fixed
suse enterprise server 15 SP4
2.4.66-150400.6.57.1
fixed
suse enterprise server 15 SP5
2.4.66-150400.6.57.1
fixed
apache2-example-pages
suse enterprise server 12 SP3
2.4.66-29.131.1
fixed
suse enterprise server 12 SP5
2.4.66-35.78.1
fixed
apache2-manual
suse enterprise sap 15 SP7
2.4.66-150700.4.20.1
fixed
suse enterprise server 15 SP6
2.4.66-150600.5.52.1
fixed
suse enterprise server 15 SP7
2.4.66-150700.4.20.1
fixed
apache2-prefork
suse enterprise desktop 15 SP7
2.4.66-150700.4.20.1
fixed
suse enterprise sap 15 SP4
2.4.66-150400.6.57.1
fixed
suse enterprise sap 15 SP5
2.4.66-150400.6.57.1
fixed
suse enterprise sap 15 SP7
2.4.66-150700.4.20.1
fixed
suse enterprise server 12 SP3
2.4.66-29.131.1
fixed
suse enterprise server 12 SP5
2.4.66-35.78.1
fixed
suse enterprise server 15 SP4
2.4.66-150400.6.57.1
fixed
suse enterprise server 15 SP5
2.4.66-150400.6.57.1
fixed
suse enterprise server 15 SP6
2.4.66-150600.5.52.1
fixed
suse enterprise server 15 SP7
2.4.66-150700.4.20.1
fixed
apache2-tls13
suse enterprise server 12 SP5
2.4.66-35.78.1
fixed
apache2-tls13-devel
suse enterprise server 12 SP5
2.4.66-35.78.1
fixed
apache2-tls13-doc
suse enterprise server 12 SP5
2.4.66-35.78.1
fixed
apache2-tls13-example-pages
suse enterprise server 12 SP5
2.4.66-35.78.1
fixed
apache2-tls13-prefork
suse enterprise server 12 SP5
2.4.66-35.78.1
fixed
apache2-tls13-utils
suse enterprise server 12 SP5
2.4.66-35.78.1
fixed
apache2-tls13-worker
suse enterprise server 12 SP5
2.4.66-35.78.1
fixed
apache2-utils
suse enterprise sap 15 SP4
2.4.66-150400.6.57.1
fixed
suse enterprise sap 15 SP5
2.4.66-150400.6.57.1
fixed
suse enterprise sap 15 SP7
2.4.66-150700.4.20.1
fixed
suse enterprise server 12 SP3
2.4.66-29.131.1
fixed
suse enterprise server 12 SP5
2.4.66-35.78.1
fixed
suse enterprise server 15 SP4
2.4.66-150400.6.57.1
fixed
suse enterprise server 15 SP5
2.4.66-150400.6.57.1
fixed
suse enterprise server 15 SP6
2.4.66-150600.5.52.1
fixed
suse enterprise server 15 SP7
2.4.66-150700.4.20.1
fixed
apache2-worker
suse enterprise sap 15 SP4
2.4.66-150400.6.57.1
fixed
suse enterprise sap 15 SP5
2.4.66-150400.6.57.1
fixed
suse enterprise sap 15 SP7
2.4.66-150700.4.20.1
fixed
suse enterprise server 12 SP3
2.4.66-29.131.1
fixed
suse enterprise server 12 SP5
2.4.66-35.78.1
fixed
suse enterprise server 15 SP4
2.4.66-150400.6.57.1
fixed
suse enterprise server 15 SP5
2.4.66-150400.6.57.1
fixed
suse enterprise server 15 SP6
2.4.66-150600.5.52.1
fixed
suse enterprise server 15 SP7
2.4.66-150700.4.20.1
fixed
Red Hat logo
Red Hat Enterprise Linux Releases
Red Hat Product
Release
httpd
RHEL 9
0:2.4.62-13.el9_8.1
fixed
httpd-core
RHEL 9
0:2.4.62-13.el9_8.1
fixed
httpd-devel
RHEL 9
0:2.4.62-13.el9_8.1
fixed
httpd-filesystem
RHEL 9
0:2.4.62-13.el9_8.1
fixed
httpd-manual
RHEL 9
0:2.4.62-13.el9_8.1
fixed
httpd-tools
RHEL 9
0:2.4.62-13.el9_8.1
fixed
mod
RHEL 9
1:2.4.62-13.el9_8.1
fixed
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
httpd
Amazon Linux 2
0:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
httpd-core
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
httpd-core-debuginfo
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
httpd-debuginfo
Amazon Linux 2
0:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
httpd-debugsource
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
httpd-devel
Amazon Linux 2
0:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
httpd-filesystem
Amazon Linux 2
0:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
httpd-manual
Amazon Linux 2
0:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
httpd-tools
Amazon Linux 2
0:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
httpd-tools-debuginfo
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
mod_ldap
Amazon Linux 2
0:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
mod_ldap-debuginfo
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
mod_lua
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
mod_lua-debuginfo
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
mod_md
Amazon Linux 2
0:2.4.67-1.amzn2.0.1
fixed
mod_proxy_html
Amazon Linux 2
1:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
1:2.4.67-1.amzn2023.0.1
fixed
mod_proxy_html-debuginfo
Amazon Linux 2023
1:2.4.67-1.amzn2023.0.1
fixed
mod_session
Amazon Linux 2
0:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
mod_session-debuginfo
Amazon Linux 2023
0:2.4.67-1.amzn2023.0.1
fixed
mod_ssl
Amazon Linux 2
1:2.4.67-1.amzn2.0.1
fixed
Amazon Linux 2023
1:2.4.67-1.amzn2023.0.1
fixed
mod_ssl-debuginfo
Amazon Linux 2023
1:2.4.67-1.amzn2023.0.1
fixed
Common Weakness Enumeration
References
https://httpd.apache.org/security/vulnerabilities_24.html
http://www.openwall.com/lists/oss-security/2026/05/05/9
https://access.redhat.com/errata/RHSA-2026:21391
https://access.redhat.com/errata/RHSA-2026:21433
https://access.redhat.com/errata/RHSA-2026:22140
https://access.redhat.com/errata/RHSA-2026:27200
https://access.redhat.com/errata/RHSA-2026:27201
https://access.redhat.com/errata/RHSA-2026:36373
https://access.redhat.com/errata/RHSA-2026:36831
https://access.redhat.com/errata/RHSA-2026:36846
https://access.redhat.com/errata/RHSA-2026:47046
https://access.redhat.com/security/cve/CVE-2026-28780
https://bugzilla.redhat.com/show_bug.cgi?id=2466913
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28780.json