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CVE-2026-34355 is a moderate-severity buffer overflow vulnerability in the mod_proxy_html module of Apache HTTP Server. It affects Apache HTTP Server 2.4.67 and earlier, including the 2.4.x branch through 2.4.67. The flaw can be triggered when httpd processes content from an untrusted backend through mod_proxy_html, causing memory corruption in the proxy HTML filtering path. The vulnerability is associated with backend-supplied content handling in mod_proxy_html and may allow a malicious or untrusted backend server to overflow an internal buffer during response rewriting or filtering.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A buffer overflow vulnerability in Apache HTTP Server mod_proxy_html that can be exploited by an untrusted backend server.
A buffer overflow vulnerability in Apache HTTP Server's proxy HTML filter that can allow a malicious backend server to crash the host process via crafted content.
A vulnerability addressed in the Apache HTTP Server 2.4.68 security update.
Vulnerability in Apache HTTP Server mod_proxy_html; exact impact is not fully recoverable from the provided text due to encoding issues, but it is listed among the fixed security issues in Apache 2.4.68.
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.