Which versions of Html Sanitize Ex are affected by EUVD-2026-54084?

Elixir applications using the html_sanitize_ex HTML sanitization library (versions 0.3.1-1.5.2) face unauthenticated denial-of-service attacks that can render services unresponsive with minimal…. A patch is available.

How to fix or mitigate EUVD-2026-54084?

Within 24 hours, inventory all applications and services running vulnerable versions of html_sanitize_ex (0.3.1 through 1.5.2 inclusive) to identify scope of exposure. Within 7 days, upgrade all affected instances to the latest patched release available per vendor advisory, and validate changes in staging before production deployment. Within 30 days, confirm patch deployment across all production systems and document remediation status for compliance records.

Html Sanitize Ex EUVD-2026-54084

Q: What is the CVSS score of EUVD-2026-54084?

EUVD-2026-54084 has a CVSS 4.0 base score of 8.2 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/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. EPSS exploitation probability: 0.4%.

| CVE-2026-68749 HIGH

Inefficient Regular Expression Complexity (ReDoS) (CWE-1333)

2026-08-06 EEF

GHSA-8rjf-8hw9-j63g

Denial Of Service Html Sanitize Ex Rrrene

8.2

CVSS 4.0 · Vendor: EEF

Severity by source

Vendor (EEF) PRIMARY

8.2 HIGH

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/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

Primary rating from Vendor (EEF) · only source for this CVE.

CVSS VectorVendor: EEF

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

Source Code Evidence Fetched

Aug 06, 2026 - 16:07 vuln.today

Analysis Generated

Aug 06, 2026 - 16:07 vuln.today

CVE Published

Aug 06, 2026 - 14:50 cve.org

HIGH 8.2

DescriptionCVE.org

Inefficient Regular Expression Complexity vulnerability in the CSS scrubber in rrrene html_sanitize_ex allows an unauthenticated remote attacker to exhaust server CPU via a long CSS declaration in sanitized HTML. The declaration regex in HtmlSanitizeEx.Scrubber.CSS.scrub/1 matches the property name with an unbounded greedy [-\w]+ followed by a mandatory :, so a long run of word characters not followed by a colon makes the engine give back one character at a time and retry the colon at every start offset. The work is quadratic in the length of the run, and no length cap is applied to the CSS handed to the scrubber. An 80 KB <style> body costs roughly 2.4 seconds of scheduler time, so a few concurrent requests saturate the BEAM scheduler pool and make the application unresponsive.

The impact is CPU exhaustion only. Nothing is read, modified or disclosed.

This issue affects html_sanitize_ex: from 0.3.1 before 1.5.3.

AnalysisAI

CPU exhaustion via quadratic regex backtracking in rrrene/html_sanitize_ex, an Elixir HTML sanitization library, allows unauthenticated remote attackers to saturate the BEAM scheduler pool and render applications unresponsive. The CSS scrubber's declaration regex applies an unbounded greedy quantifier on the property-name token; a crafted 80 KB style body containing no valid CSS colon costs approximately 2.4 seconds of scheduler time per request, meaning a handful of concurrent requests fully deny service. Affected versions span 0.3.1 through 1.5.2 inclusive; impact is strictly availability — no confidentiality or integrity loss occurs. No public exploit or CISA KEV listing is identified at time of analysis.