CVE-2026-42536: CWE-122 Heap-based Buffer Overflow in Apache Software Foundation Apache HTTP Server
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.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-42536) is a heap-based buffer overflow in Apache HTTP Server's mod_xml2enc module triggered by processing untrusted content via the xml2StartParse function. It affects Apache HTTP Server versions from 2.4.0 up to and including 2.4.67. The vulnerability can cause a denial of service due to application crash (availability impact). Red Hat's security advisory confirms the issue and provides updated httpd packages that fix this vulnerability. Users are recommended to upgrade to Apache HTTP Server version 2.4.68 or apply the corresponding Red Hat security update.
Potential Impact
The vulnerability allows an attacker to cause a denial of service by triggering a heap-based buffer overflow in the Apache HTTP Server mod_xml2enc module. There is no indication of confidentiality or integrity impact. The CVSS score of 7.5 reflects a high severity with network attack vector, no privileges required, no user interaction, and impact limited to availability.
Mitigation Recommendations
A fix is available in Apache HTTP Server version 2.4.68. Users should upgrade to this version to remediate the vulnerability. Red Hat has released updated httpd packages for Red Hat Enterprise Linux 10 that include the fix. Applying these official patches from the vendor is the recommended remediation. Patch status is confirmed by the vendor advisory.
CVE-2026-42536: CWE-122 Heap-based Buffer Overflow in Apache Software Foundation Apache HTTP Server
Description
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.
CVSS v3.1
Score 7.5high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-42536) is a heap-based buffer overflow in Apache HTTP Server's mod_xml2enc module triggered by processing untrusted content via the xml2StartParse function. It affects Apache HTTP Server versions from 2.4.0 up to and including 2.4.67. The vulnerability can cause a denial of service due to application crash (availability impact). Red Hat's security advisory confirms the issue and provides updated httpd packages that fix this vulnerability. Users are recommended to upgrade to Apache HTTP Server version 2.4.68 or apply the corresponding Red Hat security update.
Potential Impact
The vulnerability allows an attacker to cause a denial of service by triggering a heap-based buffer overflow in the Apache HTTP Server mod_xml2enc module. There is no indication of confidentiality or integrity impact. The CVSS score of 7.5 reflects a high severity with network attack vector, no privileges required, no user interaction, and impact limited to availability.
Mitigation Recommendations
A fix is available in Apache HTTP Server version 2.4.68. Users should upgrade to this version to remediate the vulnerability. Red Hat has released updated httpd packages for Red Hat Enterprise Linux 10 that include the fix. Applying these official patches from the vendor is the recommended remediation. Patch status is confirmed by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-04-28T16:06:25.760Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-42536","vendor":"Red Hat"}]
Threat ID: 6a26e463e29bf47b501e0dbb
Added to database: 06/08/2026, 15:48:51 UTC
Last enriched: 07/24/2026, 22:23:53 UTC
Last updated: 07/31/2026, 21:26:47 UTC
Views: 172
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