fedora-python lxml_html_clean up to 0.4.3 escape output

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability was found in fedora-python lxml_html_clean up to 0.4.3 and classified as problematic. The impacted element is the function lxml_html_clean. The manipulation results in escape output. This vulnerability is known as CVE-2026-28350. It is possible to launch the attack remotely. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in fedora-python lxml_html_clean up to 0.4.3. Affected is the function lxml_html_clean. The manipulation with an unknown input leads to a escape output vulnerability. CWE is classifying the issue as 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. This is going to have an impact on integrity. CVE summarizes:

lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.4, the <base> tag passes through the default Cleaner configuration. While page_structure=True removes html, head, and title tags, there is no specific handling for <base>, allowing an attacker to inject it and hijack relative links on the page. This issue has been patched in version 0.4.4.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-28350 since 02/26/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 301400 (Linux Distros Unpatched Vulnerability : CVE-2026-28350), 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 9c5612ca33b941eec4178abf8a5294b103403f34 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 (301400). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.2
VulDB Meta Temp Score: 5.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

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

CVSSv2info

AVACAuCIA
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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: 301400
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-28350

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: lxml_html_clean 0.4.4
Patch: 9c5612ca33b941eec4178abf8a5294b103403f34

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-xvp8-3mhv-424c
Status: Confirmed

CVE: CVE-2026-28350 (🔒)
GCVE (CVE): GCVE-0-2026-28350
GCVE (VulDB): GCVE-100-349290

Entryinfo

Created: 03/06/2026 06:35
Updated: 03/10/2026 12:11
Changes: 03/06/2026 06:35 (67), 03/07/2026 14:04 (2), 03/07/2026 23:35 (1), 03/10/2026 12:11 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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