CVE WatchJul 21, 2026

CVE-2026-16158

Impact: @fastify/reply-from versions from 8.3.1 up to but not including 12.6.4 build the internal URL cache key by concatenating the destina

CVSS

8.7

High

EPSS

0.2%

p14

KEV

—

Exploit Today

0-100

Published: Jul 18, 2026 · Last modified: Jul 21, 2026 · CWE-441

EPSS · 30d

0.2%EPSS · 30 days0.2%

2026-07-192026-07-22

Technical description

Impact: @fastify/reply-from versions from 8.3.1 up to but not including 12.6.4 build the internal URL cache key by concatenating the destination and source path without a delimiter. Different destination and source pairs can therefore produce the same key while resolving to different upstream URLs. When getUpstream selects an upstream from request data, a URL cached for one upstream can be reused for a request intended for another upstream, causing cross-upstream data access and modification. The default configuration is affected. Setting disableCache to true prevents the behavior. Patches: upgrade to @fastify/reply-from 12.6.4. Workarounds: pass disableCache: true when registering the plugin.

Official references

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