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CVE-2026-34356 is a heap-based buffer overflow vulnerability in Apache HTTP Server affecting the reverse cookie mapping functionality associated with the ProxyPassReverseCookie* directives, specifically noted in relation to ProxyPassReverseCookieMap. The flaw affects Apache HTTP Server versions 2.4.0 through 2.4.67. The issue can be triggered when httpd processes data from a malicious, untrusted, compromised, or non-TLS backend server while reverse proxy cookie rewriting is enabled. Under those conditions, backend-supplied cookie-related data can cause memory corruption in heap-allocated structures during reverse cookie mapping operations.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
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.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability affecting IBM HTTP Server configurations using ProxyPassReverseCookieMap with untrusted, compromised, or non-TLS backend servers.
A heap-based overflow vulnerability in Apache HTTP Server ProxyPassReverseCookieMap triggered by malicious backend servers.
A heap-related memory corruption vulnerability in Apache HTTP Server's reverse cookie mapping mechanism that allows an untrusted backend to overflow internal structures.
A vulnerability addressed in the Apache HTTP Server 2.4.68 security update.
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.