CVE-2026-28780

criticalpriority · track · 0EPSS 0.014 · 72 %ileDEEUNLRUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.38% (72nd) EPSS

CVSS 9.8 · critical

Is it mine?

36 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.1–9.8

v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondaryexploitability 3.9 · impact 5.9

v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondaryexploitability 2.2 · impact 5.9

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-122USCWE-122USCWE-122USCWE-787US

affected products (36)

Products and version ranges known to be affected.

Amazon Linux 2all versionscert_bundDEcpe:/o:amazon:linux_2:-
Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Fedora Linuxall versionscert_bundDEcpe:/o:fedoraproject:fedora:-
Gentoo Linuxall versionscert_bundDEcpe:/o:gentoo:linux:-
IBM Business Automation Workflow 24.0.0-24.0.1all versionscert_bundDEcpe:/a:ibm:business_automation_workflow:24.0.0_-_24.0.1
IBM Business Automation Workflow 25.0.0-25.0.1all versionscert_bundDEcpe:/a:ibm:business_automation_workflow:25.0.0_-_25.0.1
IBM DevOps Code ClearCase 11.0.0-11.0.0.05all versionscert_bundDEcpe:/a:ibm:devops_code_clearcase:11.0.0_-_11.0.0.05
IBM HTTP Server 8.5all versionscert_bundDEcpe:/a:ibm:http_server:8.5
IBM HTTP Server 9.0all versionscert_bundDEcpe:/a:ibm:http_server:9.0
IBM Power Hardware Management Consoleall versionscert_bundDEcpe:/a:ibm:hardware_management_console:-
IBM Rational ClearCase 10.0.0-10.0.1.05all versionscert_bundDEcpe:/a:ibm:rational_clearcase:10.0.0_-_10.0.1.05
IBM Rational ClearCase 9.1.0-9.1.0.10all versionscert_bundDEcpe:/a:ibm:rational_clearcase:9.1.0_-_9.1.0.10
IBM Rational ClearQuest 10.0-10.0.10all versionscert_bundDEcpe:/a:ibm:rational_clearquest:10.0_-_10.0.10
IBM Rational ClearQuest 9.1-9.1.0.11all versionscert_bundDEcpe:/a:ibm:rational_clearquest:9.1_-_9.1.0.11
IBM Tivoli Monitoringall versionscert_bundDEcpe:/a:ibm:tivoli_monitoring:-
Microsoft Azure Linux azl3all versionscert_bundDEcpe:/o:microsoft:azure_linux:azl3
Oracle Linuxall versionscert_bundDEcpe:/o:oracle:linux:-
RESF Rocky Linuxall versionscert_bundDEcpe:/o:resf:rocky_linux:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Red Hat JBoss Core Servicesall versionscert_bundDEcpe:/a:redhat:jboss_core_services:-

showing 20 of 36

advisories (3)

Vendor and ecosystem advisories describing this.

NCSC-2026-0134Kwetsbaarheden verholpen in Apache HTTP ServerNL2026-05-06csaf · ncsc_nlNL
Apache Software Foundation heeft meerdere kwetsbaarheden verholpen in Apache HTTP Server.
WID-SEC-W-2026-1354Apache HTTP Server: Mehrere SchwachstellenDeutsch2026-05-04csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Apache HTTP Server ausnutzen, um erweiterte Privilegien zu erlangen, beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen oder einen Denial-of-Service-Zustand zu verursachen.
BIT-apache-2026-28780Apache HTTP Server: buffer overflow in mod_proxy_ajp via ajp_msg_check_header()2026-05-07vendor · osvUS
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.

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund ncsc_nl osv NVD CVE.org MITRE

published 2026-05-05modified 2026-09-14

references (20)

External citations — patches, advisories, analysis.

scry

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