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CVE-2026-40460 is an address spoofing vulnerability in NGINX Open Source and NGINX Plus when configured to use the HTTP/3 QUIC module (ngx_quic_module). Under this configuration, a remote attacker can spoof the apparent client source IP address during HTTP/3 processing. The flaw affects deployments that rely on client IP information for security decisions, particularly IP-based authorization controls and rate-limiting logic. The issue was fixed in NGINX stable 1.30.1 and mainline 1.31.0. Specific vulnerable function-level details are not available in the provided information.
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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.
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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.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An NGINX ngx_quic_module IP spoofing/authentication bypass vulnerability mentioned as part of prior NGINX and HTTP/3-related disclosures.
An NGINX ngx_quic_module vulnerability mentioned only as part of recent vendor security history.
Уязвимость в реализации HTTP/3 в nginx, приводящая к раскрытию IP-адреса клиента.
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.