CVE-2026-54272
ip-address: Misclassification of IPv4-mapped/NAT64 IPv6 addresses can bypass SSRF and trust-boundary checks
Description
ip-address is a library for parsing and manipulating IPv4 and IPv6 addresses in JavaScript. Versions 10.1.1 through 10.2.0 are vulnerable to SSRF through misclassification of IPv4-mapped/NAT64 IPv6 addresses. Address6.getType() classifies an address by matching it against a table of known IPv6 special-use prefixes, returning Global unicast when nothing matches. That table had no entry for the IPv4-mapped range (::ffff:0:0/96), so every mapped address fell through to Global unicast; NAT64 addresses matched their own NAT64 … labels. The boolean checks isLoopback, isUnspecified, and isMulticast compared getType() against a fixed label and so returned false, while isLinkLocal and isULA checked only the native IPv6 ranges. The library already exposed isMapped4() and to4(), but did not apply them inside these checks, so a mapped or NAT64 address was never normalized to its embedded IPv4 address before classification. For IPv4-mapped addresses the host OS routes to the IPv4 stack, so the misclassification is reachable on any dual-stack host. For NAT64, the classification bypass is unconditional but end-to-end reachability additionally requires a NAT64/DNS64 gateway in the deployment network.This issue has been fixed in version 10.2.1.
INFO
Published Date :
July 27, 2026, 6:16 p.m.
Last Modified :
Oct. 24, 2026, 1:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update the ip-address library to version 10.2.1.
- Apply patches for versions prior to 10.2.1.
- Review address classification logic.
- Ensure proper IPv4-mapped address handling.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-54272.
| URL | Resource |
|---|---|
| https://github.com/beaugunderson/ip-address/security/advisories/GHSA-22jq-vg5j-6vgg | |
| https://github.com/beaugunderson/ip-address/security/advisories/GHSA-22jq-vg5j-6vgg |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-54272 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-54272
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-54272 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-54272 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Translated by [email protected]
Oct. 24, 2026
Action Type Old Value New Value Added Translation Title: ip-address de beaugunderson, Description: ip-address es una biblioteca para analizar y manipular direcciones IPv4 e IPv6 en JavaScript. Las versiones 10.1.1 a 10.2.0 son vulnerables a SSRF a través de la clasificación errónea de direcciones IPv6 mapeadas a IPv4/NAT64. Address6.getType() clasifica una dirección al compararla con una tabla de prefijos IPv6 de uso especial conocidos, devolviendo Global unicast cuando nada coincide. Esa tabla no tenía ninguna entrada para el rango mapeado a IPv4 (::ffff:0:0/96), por lo que cada dirección mapeada caía en Global unicast; las direcciones NAT64 coincidían con sus propias etiquetas NAT64 .... Las comprobaciones booleanas isLoopback, isUnspecified e isMulticast comparaban getType() con una etiqueta fija y por lo tanto devolvían false, mientras que isLinkLocal e isULA solo comprobaban los rangos IPv6 nativos. La biblioteca ya exponía isMapped4() y to4(), pero no las aplicaba dentro de estas comprobaciones, por lo que una dirección mapeada o NAT64 nunca se normalizaba a su dirección IPv4 incrustada antes de la clasificación. Para las direcciones mapeadas a IPv4, el sistema operativo del host enruta a la pila IPv4, por lo que la clasificación errónea es alcanzable en cualquier host de doble pila. Para NAT64, el bypass de clasificación es incondicional pero la alcanzabilidad de extremo a extremo adicionalmente requiere una pasarela NAT64/DNS64 en la red de despliegue. Este problema ha sido solucionado en la versión 10.2.1. -
New CVE Received by [email protected]
Jul. 27, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'beaugunderson', 'product': 'ip-address', 'versions': [{'status': 'affected', 'version': '>= 10.1.1, < 10.2.1'}]}] Added Description ip-address is a library for parsing and manipulating IPv4 and IPv6 addresses in JavaScript. Versions 10.1.1 through 10.2.0 are vulnerable to SSRF through misclassification of IPv4-mapped/NAT64 IPv6 addresses. Address6.getType() classifies an address by matching it against a table of known IPv6 special-use prefixes, returning Global unicast when nothing matches. That table had no entry for the IPv4-mapped range (::ffff:0:0/96), so every mapped address fell through to Global unicast; NAT64 addresses matched their own NAT64 … labels. The boolean checks isLoopback, isUnspecified, and isMulticast compared getType() against a fixed label and so returned false, while isLinkLocal and isULA checked only the native IPv6 ranges. The library already exposed isMapped4() and to4(), but did not apply them inside these checks, so a mapped or NAT64 address was never normalized to its embedded IPv4 address before classification. For IPv4-mapped addresses the host OS routes to the IPv4 stack, so the misclassification is reachable on any dual-stack host. For NAT64, the classification bypass is unconditional but end-to-end reachability additionally requires a NAT64/DNS64 gateway in the deployment network.This issue has been fixed in version 10.2.1. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-20 Added CWE CWE-918 Added Reference https://github.com/beaugunderson/ip-address/security/advisories/GHSA-22jq-vg5j-6vgg -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 27, 2026
Action Type Old Value New Value Added Reference https://github.com/beaugunderson/ip-address/security/advisories/GHSA-22jq-vg5j-6vgg Added SSVC {'id': 'CVE-2026-54272', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-27T17:41:46.238340Z'}