Vulnerability Monitor

The vendors, products, and vulnerabilities you care about

CVE-2014-3146

Incomplete blacklist vulnerability in the lxml.html.clean module in lxml before 3.3.5 allows remote attackers to conduct cross-site scripting (XSS) attacks via control characters in the link scheme to the clean_html function.

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 6.1, indicating it can be exploited remotely over the network with relatively low complexity though user interaction is required and does not require pre-existing privileges . The vulnerability impacts limited data confidentiality, limited integrity, for affected systems. Impacting 1 product from lxml organizations running these solutions should prioritize assessment and patching.

Historical Context

Documented in 2014, this vulnerability occurred amid the cloud computing expansion era, where traditional network perimeter security models were being reevaluated. Organizations were transitioning from isolated infrastructure to interconnected systems, creating new attack surfaces that vulnerabilities like this could exploit.

Published

2014-05-14T19:55:11.653

Last Modified

2026-05-06T22:30:45.220

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.1 (MEDIUM)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:N/I:P/A:N

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: PARTIAL
Availability Impact: NONE

Exploitability Score

8.6

Impact Score

2.9

Weaknesses

Type: Primary
NVD-CWE-Other
Type: Secondary
CWE-79

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	lxml	lxml	≤ 3.3.4	Yes
Application	lxml	lxml	0.5	Yes
Application	lxml	lxml	0.5.1	Yes
Application	lxml	lxml	0.6	Yes
Application	lxml	lxml	0.7	Yes
Application	lxml	lxml	0.8	Yes
Application	lxml	lxml	0.9	Yes
Application	lxml	lxml	0.9.1	Yes
Application	lxml	lxml	0.9.2	Yes
Application	lxml	lxml	1.0	Yes
Application	lxml	lxml	1.0.1	Yes
Application	lxml	lxml	1.0.2	Yes
Application	lxml	lxml	1.0.3	Yes
Application	lxml	lxml	1.0.4	Yes
Application	lxml	lxml	1.1	Yes
Application	lxml	lxml	1.1.1	Yes
Application	lxml	lxml	1.1.2	Yes
Application	lxml	lxml	1.2	Yes
Application	lxml	lxml	1.2.1	Yes
Application	lxml	lxml	1.3	Yes
Application	lxml	lxml	1.3.1	Yes
Application	lxml	lxml	1.3.2	Yes
Application	lxml	lxml	1.3.3	Yes
Application	lxml	lxml	1.3.4	Yes
Application	lxml	lxml	1.3.5	Yes
Application	lxml	lxml	1.3.6	Yes
Application	lxml	lxml	2.0	Yes
Application	lxml	lxml	2.0.1	Yes
Application	lxml	lxml	2.0.2	Yes
Application	lxml	lxml	2.0.3	Yes
Application	lxml	lxml	2.0.4	Yes
Application	lxml	lxml	2.0.5	Yes
Application	lxml	lxml	2.0.6	Yes
Application	lxml	lxml	2.0.7	Yes
Application	lxml	lxml	2.0.8	Yes
Application	lxml	lxml	2.0.9	Yes
Application	lxml	lxml	2.0.10	Yes
Application	lxml	lxml	2.0.11	Yes
Application	lxml	lxml	2.1	Yes
Application	lxml	lxml	2.1	Yes
Application	lxml	lxml	2.1	Yes
Application	lxml	lxml	2.1	Yes
Application	lxml	lxml	2.1.1	Yes
Application	lxml	lxml	2.1.2	Yes
Application	lxml	lxml	2.1.3	Yes
Application	lxml	lxml	2.1.4	Yes
Application	lxml	lxml	2.2	Yes
Application	lxml	lxml	2.2	Yes
Application	lxml	lxml	2.2	Yes
Application	lxml	lxml	2.2	Yes
Application	lxml	lxml	2.2	Yes
Application	lxml	lxml	2.2	Yes
Application	lxml	lxml	2.2.1	Yes
Application	lxml	lxml	2.2.2	Yes
Application	lxml	lxml	2.2.3	Yes
Application	lxml	lxml	2.2.4	Yes
Application	lxml	lxml	2.2.5	Yes
Application	lxml	lxml	2.2.6	Yes
Application	lxml	lxml	2.2.7	Yes
Application	lxml	lxml	2.2.8	Yes
Application	lxml	lxml	2.3	Yes
Application	lxml	lxml	2.3	Yes
Application	lxml	lxml	2.3	Yes
Application	lxml	lxml	2.3	Yes
Application	lxml	lxml	2.3.1	Yes
Application	lxml	lxml	2.3.2	Yes
Application	lxml	lxml	2.3.3	Yes
Application	lxml	lxml	2.3.4	Yes
Application	lxml	lxml	2.3.5	Yes
Application	lxml	lxml	2.3.6	Yes
Application	lxml	lxml	3.0	Yes
Application	lxml	lxml	3.0	Yes
Application	lxml	lxml	3.0	Yes
Application	lxml	lxml	3.0	Yes
Application	lxml	lxml	3.0.1	Yes
Application	lxml	lxml	3.0.2	Yes
Application	lxml	lxml	3.1	Yes
Application	lxml	lxml	3.1.0	Yes
Application	lxml	lxml	3.1.1	Yes
Application	lxml	lxml	3.1.2	Yes
Application	lxml	lxml	3.2.0	Yes
Application	lxml	lxml	3.2.1	Yes
Application	lxml	lxml	3.2.2	Yes
Application	lxml	lxml	3.2.3	Yes
Application	lxml	lxml	3.2.4	Yes
Application	lxml	lxml	3.2.5	Yes
Application	lxml	lxml	3.3.0	Yes
Application	lxml	lxml	3.3.0	Yes
Application	lxml	lxml	3.3.0	Yes
Application	lxml	lxml	3.3.0	Yes
Application	lxml	lxml	3.3.0	Yes
Application	lxml	lxml	3.3.0	Yes
Application	lxml	lxml	3.3.1	Yes
Application	lxml	lxml	3.3.2	Yes
Application	lxml	lxml	3.3.3	Yes

References

http://advisories.mageia.org/MGASA-2014-0218.html ([email protected])
http://lists.opensuse.org/opensuse-updates/2014-05/msg00083.html ([email protected])
http://lxml.de/3.3/changes-3.3.5.html ([email protected])
http://seclists.org/fulldisclosure/2014/Apr/210 ([email protected])
http://seclists.org/fulldisclosure/2014/Apr/319 Exploit ([email protected])
http://secunia.com/advisories/58013 Vendor Advisory ([email protected])
http://secunia.com/advisories/58744 ([email protected])
http://secunia.com/advisories/59008 ([email protected])
http://www.debian.org/security/2014/dsa-2941 ([email protected])
http://www.mandriva.com/security/advisories?name=MDVSA-2015:112 ([email protected])
http://www.openwall.com/lists/oss-security/2014/05/09/7 ([email protected])
http://www.securityfocus.com/bid/67159 Exploit ([email protected])
http://www.ubuntu.com/usn/USN-2217-1 ([email protected])
https://mailman-mail5.webfaction.com/pipermail/lxml/2014-April/007128.html Exploit ([email protected])
http://advisories.mageia.org/MGASA-2014-0218.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-updates/2014-05/msg00083.html (af854a3a-2127-422b-91ae-364da2661108)
http://lxml.de/3.3/changes-3.3.5.html (af854a3a-2127-422b-91ae-364da2661108)
http://seclists.org/fulldisclosure/2014/Apr/210 (af854a3a-2127-422b-91ae-364da2661108)
http://seclists.org/fulldisclosure/2014/Apr/319 Exploit (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/58013 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/58744 (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/59008 (af854a3a-2127-422b-91ae-364da2661108)
http://www.debian.org/security/2014/dsa-2941 (af854a3a-2127-422b-91ae-364da2661108)
http://www.mandriva.com/security/advisories?name=MDVSA-2015:112 (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2014/05/09/7 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/67159 Exploit (af854a3a-2127-422b-91ae-364da2661108)
http://www.ubuntu.com/usn/USN-2217-1 (af854a3a-2127-422b-91ae-364da2661108)
https://mailman-mail5.webfaction.com/pipermail/lxml/2014-April/007128.html Exploit (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For lxml's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.