vulnerability · Mon 05 Oct 2026 · 23:30 UTC
GHSA-jqcg-44mw-7w3h: proxy-addr vulnerable to IP spoofing via IPv4-mapped IPv6 trust subnet
Filed UTCSource GTH ↗
proxy-addr determines which network hops are trusted proxies so that X-Forwarded-For can be believed. When an application configures a trust subnet as an IPv4-mapped IPv6 address with a short prefix, such as ::ffff:10.0.0.0/8 (the correct spelling is ::ffff:10.0.0.0/104), the subnet compiles with all-zero leading bits and matches every IPv4 address instead of the block it names. The same happens for any IPv6 trust subnet with zero leading bits, such as ::/1. …
Signals
as the pipeline stamped them- High
- Critical vulnerability — CVSS 9.1
- What to do
- Critical severity — schedule an urgent patch.
CVE
KEV from CISA · EPSS from FIRST| Id | KEV | EPSS | Reference |
|---|---|---|---|
| CVE-2026-90711 | — | 0.33% | NVD ↗ |
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