2.3

CVE-2026-73491: flavorjones loofah Incomplete List of Disallowed Inputs

CVSS: 2.3v4.0LowAwaiting analysis
AliasesUBUNTU-CVE-2026-73491DEBIAN-CVE-2026-73491CGA-23xc-7f5r-8g3p
Published 12-08-2026Last modified 13-08-2026
Open JSON

Vulnerability summary

CVE-2026-73491 is a low (CVSS 2.3) Incomplete List of Disallowed Inputs vulnerability in flavorjones loofah. EPSS estimates a 0.39% chance of exploitation in the next 30 days, higher than 32.4% of scored vulnerabilities.

Overall risk
9/100
0100
Minimal · default modelHow is this calculated?
CVSS score
2.3/10
010
Low · v4.0 (CVE.org)
EPSS score
0.39%
0%100%
Low · +0.15 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 4 · Related 5
OPENSUSE-SU-2026:12153-1OPENSUSE-SU-2026:22068-1SUSE-SU-2026:24195-1SUSE-SU-2026:24250-1CGA-J69J-2MW5-VQQJ

Timeline

  1. 12-08-2026
    PublishedVulnerability first disclosed.
  2. 13-08-2026
    Last modifiedVulnerability information updated.

Description

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: URIs whose scheme is split or prefixed with the HTML5 named whitespace character references 	 or 
. CGI.unescapeHTML leaves those references intact, so allowed_uri? reports the URL safe even though a browser decodes and strips the tab or line feed and executes the resulting javascript: URL. 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.

CVSS metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.39%

Chance of exploitation in the next 30 days

Percentile

32%

Versus all other CVEs

30-day change

+0.15 pp

From 0.24% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.39%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard29 products
  • commercial-gitlab-rails-ee-19.1All versions (No fix recorded)
  • commercial-gitlab-rails-ee-19.2< 19.2.7-r4
  • commercial-gitlab-rails-ee-fips-19.1All versions (No fix recorded)
  • commercial-gitlab-rails-ee-fips-19.2< 19.2.7-r4
  • gitlab-rails-ce-18.10All versions (No fix recorded)
Wolfi3 products
  • ruby3.2-rails-8.1< 8.1.3-r9
  • ruby3.4-rails-8.1< 8.1.3-r11
  • ruby4.0-rails-8.1< 8.1.3-r10
Debian1 product
  • ruby-loofahAll versions (No fix recorded) | < 2.25.2-1
Flavorjones1 product
RubyGems1 product
  • loofah≥ 2.25.0, < 2.25.2
Ubuntu1 product
  • ruby-loofahAll versions (No fix recorded)

6 vendors · 36 products

References

10 links