# CVE-2026-73492 — flavorjones loofah

> As of 2026-08-12, CVE-2026-73492 is a Low-severity (band derived from the CVSS v4.0 score, not stated by the CNA) vulnerability in flavorjones loofah, CVSS v4.0 2.3, EPSS 0.2% (15.7th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-73492 as of 2026-08-12; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-12

## What is CVE-2026-73492?

Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. From 2.25.0 until 2.25.2, Loofah::HTML5::Scrub.allowed_uri? does not reject javascript: or vbscript: URIs whose scheme is split by semicolon-less numeric character references such as &#58, &#9, &#10, or &#13. CGI.unescapeHTML leaves these references encoded, so allowed_uri? reports the URL safe even though a browser decodes an encoded colon or strips encoded whitespace and executes the resulting URI scheme. This issue affects only callers that pass HTML-encoded strings directly to allowed_uri?; Loofah's default sanitize() path is not affected. This issue is fixed in version 2.25.2.

The record classifies CVE-2026-73492 under weakness classes [CWE-79](https://intel.threadlinqs.com/cwe/CWE-79), [CWE-184](https://cwe.mitre.org/data/definitions/184.html). 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 54 days ago.

## Severity and exploitation probability

- **CVSS v4.0 base score:** 2.3 — Low (derived from score) (`CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 15.7% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 1.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-12

## Is CVE-2026-73492 being exploited?

It currently carries a trending score of 33 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **flavorjones**: loofah

## How to fix CVE-2026-73492

No vendor patch reference has been recorded for CVE-2026-73492 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-73492

No threat campaign in the Threadlinqs corpus currently references CVE-2026-73492, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-08-14. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/flavorjones/loofah/security/advisories/GHSA-5qhf-9phg-95m2)

**Other references**

- [github.com](https://github.com/flavorjones/loofah/pull/308)
- [github.com (f1be9d893b5a8dd79240441a912d8897e74c38c0)](https://github.com/flavorjones/loofah/commit/f1be9d893b5a8dd79240441a912d8897e74c38c0)
- [github.com (v2.25)](https://github.com/flavorjones/loofah/releases/tag/v2.25.2)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-73492
Full detection coverage and IOCs for threats exploiting CVE-2026-73492 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp