HighCVE-2026-42338

ip-address: XSS in Address6 HTML-emitting methods (CVE-2026-42338)

Published 12.05.2026Last modified 26.10.2026Sources: Red Hat, BSI, CVE.org, EUVD, OSV

Public exploit

What is affected, what to do

An exploit is publicly available. Update Beaugunderson Ip-address to version 10.1.1.

Affected: Beaugunderson Ip-address lt *..10.1.1
Fixed in: Beaugunderson Ip-address 10.1.1

Not sure whether and how you are affected? Ask a question about this vulnerability

Metrics

8.1

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: Vendor (CNA), CVSS v3

6.1

CVSS v3

Severity Medium on the scale from 0 to 10.

Source: Red Hat, BSI, CVE.org, EUVD, OSV

0.5 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 40.7

Show all metrics

Severity: High
Priority (0–325) The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first? Read in glossary: 61.06 Methodology
Exploit maturity An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack. Read in glossary: PoC (publicly reported)
XIEM Effective CVSS XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command. Read in glossary: 8.1 Methodology
CVSS v3 CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions. Read in glossary: 6.1
CVSS v4 CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions. Read in glossary: 5.3
EPSS score The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“. Read in glossary: 0.5 %; Low — model estimates < 1% exploitation likelihood.
EPSS percentile The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking. Read in glossary: 40.7; High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching. Read in glossary: —
Published: 12.05.2026
CISA assessment (SSVC): Exploitation: proof of concept · not automatable · Technical impact: partial; Source: CISA Vulnrichment, as of 13 May 2026
CWE CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect. Read in glossary: CWE-79, CWE-79

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2 NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management. Read in glossary: High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
CRA The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates. Read in glossary: From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001 ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security. Read in glossary: Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

A flaw was found in ip-address, a JavaScript library for parsing and manipulating IPv4 and IPv6 addresses. This vulnerability allows a remote attacker to perform cross-site scripting (XSS) by providing untrusted input to the Address6 constructor. When an application renders the output of Address6.group(), Address6.link(), or the AddressError.parseMessage as HTML without proper escaping, the attacker-controlled content can be executed in the user's browser.

Source: redhat_csaf, BSI WID Portal, BSI CSAF, NVD (NIST), CVE.org (MITRE), ENISA EUVD, OSV (Open Source Vulnerabilities), cvelistv5

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

Affected products
		Affected versions	Fixed in
beaugunderson	ip-address	`< 10.1.1` `< 10.1.1`	`10.1.1` `10.1.1`
IBM	App Connect Enterprise	`< 12.0.12.28` `< 13.0.8.0`	`12.0.12.28` `13.0.8.0`
IBM	App Connect Enterprise CD	`< 13.4.0`	`13.4.0`
IBM	App Connect Enterprise LTS	`< 13.4.0` `< 12.0.26`	`13.4.0` `12.0.26`
IBM	Concert	`< 3.0.0`	`3.0.0`
npm	ip-address	`—`	—

Vendors and products

Weakness classes (CWE)

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Base
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Entry at MITRE CWE-79
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Base
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Entry at MITRE CWE-79

Public exploit references

Publicly reported proof-of-concepts, exploit modules and detection templates for this vulnerability. NEOSEC links to the original sources only and does not provide any exploit code.

Public exploit references

Reference tagged as exploit	github.com (opens in a new tab)	PoC (publicly reported)reported, not verified	—

References & sources

github.combeaugunderson/ip-address/security/advisories/GHSA-v2v4-37r5-5v8gweb, x_refsource_CONFIRM, Exploit, Mitigation, Vendor advisory
NVD (NIST)vuln/detail/CVE-2026-42338advisory
github.combeaugunderson/ip-addresspackage
access.redhat.comsecurity/cve/CVE-2026-42338Vulnerability database, x_refsource_REDHAT
bugzilla.redhat.comRHBZ#2476810Issue tracking, x_refsource_REDHAT
security.access.redhat.comdata/csaf/v2/vex/2026/cve-2026-42338.jsonx_sadp-csaf-vex
access.redhat.comerrata/RHSA-2026:39246Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:35842Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:35841Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:41947Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:39868Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:35892Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:35891Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:34374Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:36754Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:33574Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:41928Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:44263Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:44267Vendor advisory, x_refsource_REDHAT
access.redhat.comerrata/RHSA-2026:44237Vendor advisory, x_refsource_REDHAT

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

11.09.2026Record modifiedRed Hat ADP

New references:

Show 3 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/42xxx/CVE-2026-42338.json">CVE-2026-42338</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:66488
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:66545

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

09.09.2026Record modifiedRed Hat ADP

New references:

https://access.redhat.com/errata/RHSA-2026:65126

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/42xxx/CVE-2026-42338.json">CVE-2026-42338</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:65126

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

07.09.2026Record modifiedRed Hat ADP

1 individual change: Affected versions (publisher)

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/42xxx/CVE-2026-42338.json">CVE-2026-42338</a>

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

03.09.2026Record modifiedRed Hat ADP
New references:
- https://access.redhat.com/errata/RHSA-2026:62335
Show the original change
Individual changes of this event as published by NVD
Type Action Before After
Reference added
—
https://access.redhat.com/errata/RHSA-2026:62335
Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:62335

28.08.2026Record modifiedRed Hat ADP

New references:

https://access.redhat.com/errata/RHSA-2026:60520

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/42xxx/CVE-2026-42338.json">CVE-2026-42338</a>
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:60520

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

Show 14 older changes

24.08.2026Record modifiedRed Hat ADP

1 individual change: Affected versions (publisher)

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+79)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+79)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

21.08.2026Record modifiedRed Hat ADP

New references:

https://access.redhat.com/errata/RHSA-2026:57590

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:57590
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+78)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10 (+79)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

20.08.2026Record modifiedRed Hat ADP

New references:

https://access.redhat.com/errata/RHSA-2026:56928

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:56928
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+50)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+78)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

19.08.2026Record modifiedRed Hat ADP

1 individual change: Affected versions (publisher)

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	changed	Confidential Compute Attestation, Exploit Intelligence, Multicluster Engine for Kubernetes (+34)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+50)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

18.08.2026Record modifiedRed Hat ADP

1 individual change: Affected versions (publisher)

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+50)	Confidential Compute Attestation, Exploit Intelligence, Multicluster Engine for Kubernetes (+34)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

10.08.2026Record modifiedRed Hat ADP

New references:

https://access.redhat.com/errata/RHSA-2026:52399

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:52399
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+49)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+49)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

05.08.2026Record modifiedRed Hat ADP

1 individual change: Affected versions (publisher)

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+49)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+49)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

03.08.2026Record modifiedRed Hat ADP

1 individual change: Affected versions (publisher)

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+49)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+49)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

28.07.2026Record modifiedRed Hat ADP

New references:

https://access.redhat.com/errata/RHSA-2026:44267

Show 2 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:44267
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+47)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+47)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

24.07.2026Record modifiedRed Hat ADP

1 individual change: Affected versions (publisher)

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+47)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+47)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

21.07.2026Record modifiedRed Hat ADP

New references:

Show 3 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:41928
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:41947
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+46)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+47)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

20.07.2026Record modifiedRed Hat ADP

1 individual change: Affected versions (publisher)

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	changed	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+46)	Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support (+46)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

09.07.2026Record modifiedRed Hat ADP

New references:

Show 3 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36754
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:36820
Affected versions (publisher)	changed	Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream (v. 9), Red Hat Ansible Automation Platform 2.6 (+27)	Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux AppStream (v. 9), Red Hat Ansible Automation Platform 2.6 (+29)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

06.07.2026Record modifiedRed Hat ADP

New references:

Show 3 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:35841
Reference	added	—	https://access.redhat.com/errata/RHSA-2026:35842
Affected versions (publisher)	changed	Red Hat Ansible Automation Platform 2.6, Red Hat Developer Hub 1.9, Red Hat OpenShift Service Mesh 2.6 (+25)	Red Hat Enterprise Linux AppStream (v. 10), Red Hat Ansible Automation Platform 2.6, Red Hat Developer Hub 1.9 (+26)

Source identifier: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c

One NVD translation into another language is hidden.

Embed badge

Show the severity and KEV status of this vulnerability on your site – with a link back here. The image is updated hourly.

<a href="https://intel.neosec.eu/en/cve/CVE-2026-42338"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-42338.svg?lang=en" alt="CVE-2026-42338 – NEOSEC Intel" height="20"></a>