CVE-2026-42536

Apache HTTP Server: mod_xml2enc heap overflow

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

Apache Software Foundation · Apache HTTP Server

CVSS v3.1 CNA

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

EPSS

2.69% chance of exploitation in the next 30 days, 86th percentile

Published

2026-06-08

Updated

2026-09-14

Proof-of-concept exploits (1)

• erberkan/CVE-2026-42536-PoC7★ · 2026-09-13

Security advisories

• https://httpd.apache.org/security/vulnerabilities_24.html
• http://www.openwall.com/lists/oss-security/2026/06/08/9

References

• CVE Record
• NVD entry

Related

• CVE-2021-27963
• CVE-2021-27964
• CVE-2021-3378
• CVE-2026-60004