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CVE-2026-42536 is a heap-based buffer overflow in Apache HTTP Server affecting versions 2.4.0 through 2.4.67. The flaw is in mod_xml2enc and is associated with xml2StartParse when the server processes untrusted content. Improper handling of attacker-influenced input can cause a write beyond the bounds of a heap-allocated buffer during parsing, resulting in memory corruption within the httpd process. Apache fixed the issue in version 2.4.68.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A heap overflow vulnerability in Apache HTTP Server mod_xml2enc via xml2StartParse with untrusted content.
A vulnerability addressed in the Apache HTTP Server 2.4.68 security update.
Apache HTTP Server vulnerability affecting mod_xml2enc, fixed in version 2.4.68.
Apache HTTP Server vulnerability in mod_xml2enc.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.