What is the CVSS score of CVE-2026-86472?

CVE-2026-86472 has a CVSS 3.1 base score of 4.8 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N. EPSS exploitation probability: 0.2%.

Is there a public PoC exploit available for CVE-2026-86472?

Yes, a public proof-of-concept exploit is available for CVE-2026-86472. Prioritise patching immediately. EPSS: 0.2%.

Is there a patch available for CVE-2026-86472?

Yes, a patch is available for CVE-2026-86472. Update the affected software to the latest version immediately.

Node.js CVE-2026-86472

EUVD-2026-78395 MEDIUM

Improper Handling of Case Sensitivity (CWE-178)

2026-09-15 openjs

GHSA-hrr3-gc8f-f4qj

Information Disclosure Node.js Red Hat Suse Fast Uri

4.8

CVSS 3.1 · Vendor: openjs

View

Vulnerability Assessment

Weakness

CWE

CWE-178

OWASP Top 10:2025

A05:2025 - Injection

ASVS 5.0

V1 - Encoding and Sanitization Case sensitivity handling

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 16, 2026

Host allowlist and denylist bypass in fast-uri, the dependency-free RFC 3986 URI parser used by Fastify and ajv, affects releases before 2.4.7, 3.0.0 through 3.1.7, and 4.0.0 through 4.1.4. Because the library lowercases the host before percent-decoding it, an encoded uppercase octet such as %41 survives as a literal 'A', and in scheme-relative references like //host the canonicalization pass that would normally repair this never runs, so parse, normalize, and equal disagree about the same hostname. Any application that makes a case-sensitive host decision on fast-uri output — a host allowlist or denylist comparing the parsed host, or code relying on equal — can be steered past that check while the evading spelling still resolves to the gated host in DNS and HTTP. Exploitation status: no public exploit identified at time of analysis.

Affected VersionsENISA

fast-uri 0 <2.4.7

fast-uri 3.0.0 <3.1.8

fast-uri 4.0.0 <4.1.5

Affected Packages

npm fast-uri fix: 2.4.7, 3.1.8, 4.1.5

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in npm

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (openjs) PRIMARY 4.8 MEDIUM

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

SUSE 5.3 MEDIUM

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

Red Hat 4.8 MEDIUM

Primary rating from Vendor (openjs).

CVSS VectorVendor: openjs

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Patch available

Sep 15, 2026 - 12:16 EUVD

DescriptionCVE.org

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.

Threat Intelligence Overview

EPSS Score

0.2%

Top 94% exploitable

Threat Intel

1 sources

Exploit

POC

Public exploit code exists

Data Quality

6 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS

Vulnrichment GHSA Vendor

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC Yes

EPSS 0.2%

Patch available Yes

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation

None

System Exposure· derived

Open

Automatable

Human Impact· derived

Medium

Technical Impact

Partial

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +24

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

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Vendor StatusVendor

SUSE

Severity: Moderate

Product	Status
SUSE Linux Enterprise Micro 5.3	Not-Affected
SUSE Linux Enterprise Micro 5.3	Not-Affected
SUSE Linux Enterprise Micro 5.3	Not-Affected
SUSE Linux Enterprise Micro 5.3	Not-Affected
SUSE Linux Enterprise Micro 5.4	Not-Affected

References

Advisories & patches

REF https://cna.openjsf.org/security-advisories.html REF https://github.com/fastify/fast-uri/security/advisories/GHSA-hrr3-gc8f-f4qj

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