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CVE-2026-56434 is a memory-safety vulnerability in the NGINX ngx_http_ssi_module. It can be triggered when Server-Side Includes (SSI) is enabled and a request path combines SSI processing with proxy_pass while proxy_buffering is disabled. An unauthenticated attacker able to act as a man in the middle and manipulate responses received from the configured upstream server can cause a use-after-free condition in an NGINX worker process. Vendor and downstream advisories also characterize the resulting condition as a heap buffer over-read.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
42 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-reachable vulnerability affecting nginx packages on Miracle Linux 8. The supplied scoring indicates high attack complexity, no privileges or user interaction required, low integrity impact, and high availability impact.
A vulnerability addressed by the Rocky Linux 9 nginx package security update RLSA-2026-59496.
A vulnerability addressed by an Oracle Linux 9 update affecting nginx core, modules, and related nginx packages. The supplied CVSS v3 vector indicates network reachability, high attack complexity, no privileges or user interaction required, with integrity and availability impact.
A vulnerability addressed by an Oracle Linux 8 NGINX package security update. The provided CVSS v3 vector indicates network exposure, high attack complexity, no privileges or user interaction required, low integrity impact, and high availability impact.
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.