CVE-2026-16158 (GCVE-0-2026-16158)

Vulnerability from cvelistv5 – Published: 2026-07-18 12:28 – Updated: 2026-07-18 12:28
VLAI
Title
@fastify/reply-from vulnerable to cross-upstream request routing via URL cache key collision
Summary
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.
Severity
8.7 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
CWE
  • CWE-441 - Unintended Proxy or Intermediary ('Confused Deputy')
Assigner
References
Impacted products
Vendor Product Version
@fastify/reply-from @fastify/reply-from Affected: 8.3.1 , < 12.6.4 (semver)
Unaffected: 12.6.4 (semver)
Create a notification for this product.
Credits
HamdaanAliQuatil mcollina UlisesGascon climba03003
Show details on NVD website
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