CVE-2026-42536
published 2026-06-08CVE-2026-42536: Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted content This issue affects Apache HTTP Server…
PriorityP346high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.83%
53.4th percentile
Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted content
This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.
Users are recommended to upgrade to version 2.4.68, which fixes the issue.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| apache | http_server | >= 2.4.0 < 2.4.68 | 2.4.68 |
| apache | httpd | — | — |
| apache_software_foundation | apache_http_server | 2.4.0 – 2.4.67 | — |
| ubuntu | apache2 | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vendor_ubuntu9.8CRITICAL
vendor_redhat7.5HIGH
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Ubuntu
Apache HTTP Server vulnerabilities
vendor_ubuntu·2026-07-08·CVSS 9.8
CVE-2026-44119 [CRITICAL] Apache HTTP Server vulnerabilities
Title: Apache HTTP Server vulnerabilities
Summary: Several security issues were fixed in Apache HTTP Server.
It was discovered that Apache HTTP Server's mod_ldap module incorrectly
handled memory when processing per-directory configurations. An attacker
could use this issue to cause the server to crash, resulting in a denial of
service, or possibly execute arbitrary code. (CVE-2026-29167)
It was discovered that Apache HTTP Server's mod_proxy_ftp module
incorrectly handled HTML generation for FTP directory listings. A remote
attacker could possibly use this issue to inject arbitrary web script or
HTML. (CVE-2026-29170)
It was discovered that Apache HTTP Server's mod_proxy_html module
incorrectly handled certain content from an untrusted backend. A remote
attacker could possibly use this
Red Hat
httpd: Apache HTTP Server: Heap-based Buffer Overflow via untrusted content in mod_xml2enc
vendor_redhat·2026-06-08·CVSS 7.5
CVE-2026-42536 [HIGH] CWE-120 httpd: Apache HTTP Server: Heap-based Buffer Overflow via untrusted content in mod_xml2enc
httpd: Apache HTTP Server: Heap-based Buffer Overflow via untrusted content in mod_xml2enc
Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted content
This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.
Users are recommended to upgrade to version 2.4.68, which fixes the issue.
A flaw was found in Apache HTTP Server, specifically within the mod_xml2enc module. This heap-based buffer overflow vulnerability can be triggered when processing untrusted content through the xml2StartParse function. A remote attacker could potentially exploit this to cause a denial of service, information disclosure, or possibly arbitrary code execution.
Statement: In Red Hat Enterprise Linux (RHEL), the httpd package includes mod_xml2enc,
VulDB
Apache HTTP Server up to 2.4.67 mod_xml2enc heap-based overflow (EUVD-2026-35100 / Nessus ID 319665)
vuldb·2026-06-09·CVSS 7.5
CVE-2026-42536 [HIGH] Apache HTTP Server up to 2.4.67 mod_xml2enc heap-based overflow (EUVD-2026-35100 / Nessus ID 319665)
A vulnerability categorized as critical has been discovered in Apache HTTP Server up to 2.4.67. This impacts an unknown function of the component mod_xml2enc. Executing a manipulation can lead to heap-based buffer overflow.
This vulnerability is tracked as CVE-2026-42536. The attack can be launched remotely. No exploit exists.
It is advisable to upgrade the affected component.
GHSA
Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted content This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.
ghsa_unreviewed·2026-06-08
CVE-2026-42536 [HIGH] CWE-122 Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted content This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.
Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted content
This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.
Users are recommended to upgrade to version 2.4.68, which fixes the issue.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-42536 httpd: Apache HTTP Server: Heap-based Buffer Overflow via untrusted content in mod_xml2enc [fedora-all]
bugzilla·2026-06-18·CVSS 7.5
CVE-2026-42536 [HIGH] CVE-2026-42536 httpd: Apache HTTP Server: Heap-based Buffer Overflow via untrusted content in mod_xml2enc [fedora-all]
CVE-2026-42536 httpd: Apache HTTP Server: Heap-based Buffer Overflow via untrusted content in mod_xml2enc [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
Bugzilla
CVE-2026-42536 httpd: Apache HTTP Server: Heap-based Buffer Overflow via untrusted content in mod_xml2enc
bugzilla·2026-06-08·CVSS 7.5
CVE-2026-42536 [HIGH] CVE-2026-42536 httpd: Apache HTTP Server: Heap-based Buffer Overflow via untrusted content in mod_xml2enc
CVE-2026-42536 httpd: Apache HTTP Server: Heap-based Buffer Overflow via untrusted content in mod_xml2enc
Heap-based Buffer Overflow vulnerability in Apache HTTP Server with mod_xml2enc, xml2StartParse, and untrusted content
This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.
Users are recommended to upgrade to version 2.4.68, which fixes the issue.
https://httpd.apache.org/security/vulnerabilities_24.htmlhttp://www.openwall.com/lists/oss-security/2026/06/08/9https://access.redhat.com/errata/RHSA-2026:25042https://access.redhat.com/errata/RHSA-2026:34109https://access.redhat.com/security/cve/CVE-2026-42536https://bugzilla.redhat.com/show_bug.cgi?id=2486411https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42536.json
2026-06-08
Published