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CVE-2026-42055 is a heap-based buffer overflow in NGINX Plus and NGINX Open Source components ngx_http_proxy_v2_module and ngx_http_grpc_module. The flaw is reachable while proxying HTTP/2 traffic through proxy_http_version 2 or grpc_pass when invalid-header validation is disabled and the configured large-client-header buffer exceeds 2 MB. Crafted oversized headers can corrupt memory in an NGINX worker process during upstream-request creation.
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No valid public exploits. Mallory filtered out 2 candidates 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.
74 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A heap-based buffer-overflow vulnerability in NGINX's HTTP/2 handling that can enable arbitrary code execution or denial of service when a target processes crafted HTTP/2 headers.
A vulnerability in NGINX affecting Rocky Linux 9 packages that permits arbitrary code execution or denial of service through a heap-based buffer overflow triggered by crafted HTTP/2 headers.
A network-accessible vulnerability affecting the CentOS 8 environment covered by a TuxCare CLSA security advisory. Successful exploitation has high confidentiality, integrity, and availability impact, but requires high attack complexity and an additional prerequisite condition under CVSS v4.
A vulnerability identified as CVE-2026-42055 addressed by an AlmaLinux 9.2 security update. The supplied record rates impact to confidentiality, integrity, and availability as high, but describes exploitation as high-complexity with an additional attack requirement.
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.