NGINX HTTP/3 QUIC source IP spoofing
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, an attacker may be able to spoof the apparent client source IP address during HTTP/3 processing. The issue affects deployments using HTTP/3/QUIC and can undermine security controls that rely on the client IP as a trust signal. Publicly available context indicates the flaw was fixed in nginx 1.30.1 stable and 1.31.0 mainline.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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.
Recent activity
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
The version that knows your environment.
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.