CVE-2026-73490
Loofah: SVG `href` attribute bypasses local-reference restriction
Description
Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. Prior to 2.25.2, Loofah's HTML5 sanitizer applies its local-reference restriction only to the xlink:href attribute on SVG use and feImage elements, while browsers also accept the plain href attribute. A crafted sanitized SVG can therefore reference an arbitrary same-origin external document; use may render external SVG content containing scripts or other dangerous content, and feImage may load external images for tracking. Applications that sanitize user-supplied SVG with Loofah's default allowlist are affected. This issue is fixed in version 2.25.2.
INFO
Published Date :
Aug. 12, 2026, 9:17 p.m.
Last Modified :
Oct. 24, 2026, 3:10 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 3.1 | MEDIUM | [email protected] |
Solution
- Update Loofah to version 2.25.2 or later.
- Review sanitizer configurations for affected elements.
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-2026-73490.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-73490 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-2026-73490
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-2026-73490 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-73490 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 Changed Translation Title: loofah de flavorjones, Description: Loofah es una biblioteca general para manipular y transformar documentos y fragmentos HTML/XML, construida sobre Nokogiri. Antes de la versión 2.25.2, el saneador HTML5 de Loofah aplica su restricción de referencia local solo al atributo xlink:href en los elementos SVG use y feImage, mientras que los navegadores también aceptan el atributo href simple. Un SVG saneado y elaborado puede, por lo tanto, hacer referencia a un documento externo de mismo origen arbitrario; use puede renderizar contenido SVG externo que contenga scripts u otro contenido peligroso, y feImage puede cargar imágenes externas para seguimiento. Las aplicaciones que sanean SVG proporcionado por el usuario con la lista de permitidos predeterminada de Loofah se ven afectadas. Este problema está solucionado en la versión 2.25.2. Title: loofah de flavorjones, Description: Loofah es una biblioteca general para manipular y transformar documentos y fragmentos HTML/XML, construida sobre Nokogiri. Antes de la versión 2.25.2, el saneador HTML5 de Loofah aplica su restricción de referencia local solo al atributo xlink:href en los elementos SVG use y feImage, mientras que los navegadores también aceptan el atributo href simple. Un SVG saneado y elaborado puede, por lo tanto, hacer referencia a un documento externo de mismo origen arbitrario; use puede renderizar contenido SVG externo que contenga scripts u otro contenido peligroso, y feImage puede cargar imágenes externas para seguimiento. Las aplicaciones que sanean SVG proporcionado por el usuario con la lista de permitidos predeterminada de Loofah se ven afectadas. Este problema está solucionado en la versión 2.25.2. -
CVE Translated by [email protected]
Oct. 23, 2026
Action Type Old Value New Value Added Translation Title: loofah de flavorjones, Description: Loofah es una biblioteca general para manipular y transformar documentos y fragmentos HTML/XML, construida sobre Nokogiri. Antes de la versión 2.25.2, el saneador HTML5 de Loofah aplica su restricción de referencia local solo al atributo xlink:href en los elementos SVG use y feImage, mientras que los navegadores también aceptan el atributo href simple. Un SVG saneado y elaborado puede, por lo tanto, hacer referencia a un documento externo de mismo origen arbitrario; use puede renderizar contenido SVG externo que contenga scripts u otro contenido peligroso, y feImage puede cargar imágenes externas para seguimiento. Las aplicaciones que sanean SVG proporcionado por el usuario con la lista de permitidos predeterminada de Loofah se ven afectadas. Este problema está solucionado en la versión 2.25.2. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 13, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-73490', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-13T13:01:37.604672Z'} -
New CVE Received by [email protected]
Aug. 12, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'flavorjones', 'product': 'loofah', 'versions': [{'status': 'affected', 'version': '< 2.25.2'}]}] Added Description Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. Prior to 2.25.2, Loofah's HTML5 sanitizer applies its local-reference restriction only to the xlink:href attribute on SVG use and feImage elements, while browsers also accept the plain href attribute. A crafted sanitized SVG can therefore reference an arbitrary same-origin external document; use may render external SVG content containing scripts or other dangerous content, and feImage may load external images for tracking. Applications that sanitize user-supplied SVG with Loofah's default allowlist are affected. This issue is fixed in version 2.25.2. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N Added CWE CWE-79 Added Reference https://github.com/flavorjones/loofah/commit/20867b9be689521887364b74822c41ef830523c9 Added Reference https://github.com/flavorjones/loofah/pull/308 Added Reference https://github.com/flavorjones/loofah/releases/tag/v2.25.2 Added Reference https://github.com/flavorjones/loofah/security/advisories/GHSA-9wjq-cp2p-hrgf