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Echo: fast-uri: security update to 2.4.7

medium Tenable Self-Hosted Container Security Plugin ID 460539

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - fast-uri is a dependency-free RFC 3986 URI parser for Node.js, used by Fastify and ajv. In versions before
 2.4.7, from 3.0.0 through 3.1.7, and from 4.0.0 through 4.1.4, fast-uri folds the host to lowercase before
 it percent-decodes the host, so a percent-encoded uppercase octet such as %41 decodes to a literal A that
 is never folded. For a scheme-relative reference such as //host there is no scheme, so the host
 canonicalization that would normally repair this does not run, and parse, normalize, and equal then
 disagree on the same host. An application that makes a case-sensitive host decision on fast-uri output,
 for example a host allowlist or denylist that compares the parsed host or uses equal, can be steered past
 the check with a percent-encoded uppercase octet, and because hostnames are case-insensitive in DNS and
 HTTP the evading spelling still reaches the host the check meant to gate. The issue is fixed in fast-uri
 2.4.7, 3.1.8, and 4.1.5, and users should upgrade to one of those versions or later. As a workaround,
 compare hosts case-insensitively by lowercasing the parsed host before any allowlist or denylist decision.
 (CVE-2026-86472)

Solution

Update the fast-uri library and its related packages to version 2.4.7 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-86472

Plugin Details

Severity: Medium

ID: 460539

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/5/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 2.1

Percentile: 8.02

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3

Vector: CVSS2#AV:N/AC:H/Au:N/C:P/I:P/A:N

CVSS Score Source: CVE-2026-86472

CVSS v3

Risk Factor: Medium

Base Score: 4.8

Temporal Score: 4.2

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 10/1/2026

Vulnerability Publication Date: 9/15/2026

Reference Information

CVE: CVE-2026-86472