fedora-python lxml_html_clean up to 0.4.3 _has_sneaky_javascript escape output

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in fedora-python lxml_html_clean up to 0.4.3. This impacts the function _has_sneaky_javascript. The manipulation leads to escape output. This vulnerability is referenced as CVE-2026-28348. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in fedora-python lxml_html_clean up to 0.4.3. It has been rated as critical. This issue affects the function _has_sneaky_javascript. The manipulation with an unknown input leads to a escape output vulnerability. Using CWE to declare the problem leads to CWE-116. The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.4, the _has_sneaky_javascript() method strips backslashes before checking for dangerous CSS keywords. This causes CSS Unicode escape sequences to bypass the @import and expression() filters, allowing external CSS loading or XSS in older browsers. This issue has been patched in version 0.4.4.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-28348 since 02/26/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 301397 (Linux Distros Unpatched Vulnerability : CVE-2026-28348), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.4.4 eliminates this vulnerability. Applying the patch 2ef732667ddbc74ea59847bcf24b75809aaeed3b is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (301397). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.1
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Escape output
CWE: CWE-116 / CWE-74 / CWE-707
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 301397
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-28348

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: lxml_html_clean 0.4.4
Patch: 2ef732667ddbc74ea59847bcf24b75809aaeed3b

Timelineinfo

02/26/2026 CVE reserved
03/06/2026 +8 days Advisory disclosed
03/06/2026 +0 days VulDB entry created
03/10/2026 +4 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-hw26-mmpg-fqfg
Status: Confirmed

CVE: CVE-2026-28348 (🔒)
GCVE (CVE): GCVE-0-2026-28348
GCVE (VulDB): GCVE-100-349325

Entryinfo

Created: 03/06/2026 07:08
Updated: 03/10/2026 12:02
Changes: 03/06/2026 07:08 (67), 03/07/2026 14:04 (2), 03/10/2026 12:02 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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