CVE-2026-16158

CriticalCVSS 10.0/10Last modified Aug 5, 2026

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.

Metrics

CVSS 3.1 10.0/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Weakness enumeration

CWE-441

Affected software

No affected versions have been published.

Timeline

Published
Jul 18, 2026
Last modified
Aug 5, 2026
NVD status
Analyzed

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CVE-2026-16158: Critical severity, CVSS 10.0 | Vulnix