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CVE-2026-16158

@fastify/reply-from vulnerable to cross-upstream request routing via URL cache key collision PUBLISHED

Description (CNA)

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.

Affected (CNA)

Vendor / productVersions
@fastify/reply-from / @fastify/reply-fromaffected 8.3.1 before 12.6.4; unaffected 12.6.4

CWE

CWE-441

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.