CVE-2026-7120 | @fastify/static evaluates the allowedPath callback before no… | CVSS 5.3 MEDIUM

Description

@fastify/static evaluates the allowedPath callback before normalizing dot segments and duplicate path separators in the pathname used for file resolution. Versions up to and including 10.1.1 are affected. An unauthenticated attacker can bypass allowedPath restrictions by requesting equivalent non-canonical pathnames, causing files that were intended to be denied to be served anyway. The bypass does not allow access outside the configured static root by itself, it defeats path-based filtering only. The issue is patched in @fastify/static 10.1.2.

Metadata

CVE ID: CVE-2026-7120
State: PUBLISHED
Assigner: openjs
Reserved: 2026-04-26 18:43 UTC
Published: 2026-07-23 02:48 UTC
Last updated: 2026-07-23 02:48 UTC
Primary CWE: CWE-180
CWE-180: Incorrect Behavior Order: Validate Before Canonical…
Vendor / Product: @fastify/static / @fastify/static
Sources: cve.org · NVD

Severity & Metrics

5.3 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products (1)

Vendor	Product	Platform	Versions
@fastify/static	@fastify/static	—	0 < 10.1.2, 10.1.2

Weakness (CWE)

CWE	Source	Description
CWE-180	cna	CWE-180: Incorrect Behavior Order: Validate Before Canonicalize

CVSS scores (1)

Score	Severity	Version	Source	Vector
5.3	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

References (2)