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Vulnerability record · CVE-2026-42536 · published 8 June 2026

CVE-2026-42536: Apache http server heap-based buffer overflow vulnerability

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.

7.5 CVSS 3.1 High EPSS 2.7% · top 14.7% CWE-122 · Heap-based buffer overflowCWE-120 · Classic buffer overflow
7.5CVSS 3.1 base score
2.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
16References
14 Sep 2026Last modified by NVD

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://httpd.apache.org/security/vulnerabilities_24.html Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/06/08/9 Mailing ListThird Party Advisory
https://access.redhat.com/errata/RHSA-2026:25042
https://access.redhat.com/errata/RHSA-2026:34109
https://access.redhat.com/errata/RHSA-2026:41906
https://access.redhat.com/errata/RHSA-2026:42828
https://access.redhat.com/errata/RHSA-2026:47046
https://access.redhat.com/errata/RHSA-2026:53371
https://access.redhat.com/errata/RHSA-2026:56868
https://access.redhat.com/errata/RHSA-2026:56869
https://access.redhat.com/errata/RHSA-2026:62165
https://access.redhat.com/errata/RHSA-2026:66323
https://access.redhat.com/errata/RHSA-2026:67152
https://access.redhat.com/security/cve/CVE-2026-42536
https://bugzilla.redhat.com/show_bug.cgi?id=2486411
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42536.json

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-42536), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.