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CVE-2026-16158

HIGH
8.7
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-16158
State
PUBLISHED
Assigner
openjs
Reserved
2026-07-17 21:22 UTC
Published
2026-07-18 12:28 UTC
Last updated
2026-07-18 12:28 UTC
Primary CWE
CWE-441
CWE-441: Unintended Proxy or Intermediary ('Confused Deputy'…
Vendor / Product
@fastify/reply-from / @fastify/reply-from
Sources
cve.org  ·  NVD

Severity & Metrics

8.7 HIGH CVSS 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Affected products (1)
VendorProductPlatformVersions
@fastify/reply-from @fastify/reply-from — 8.3.1 < 12.6.4, 12.6.4
Weakness (CWE)
CWESourceDescription
CWE-441 cna CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')
CVSS scores (1)
ScoreSeverityVersionSourceVector
8.7 HIGH 3.1 cna CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
References (2)
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