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14 vulnerabilities found for lxml by lxml
CVE-2026-41066 (GCVE-0-2026-41066)
Vulnerability from nvd – Published: 2026-04-24 16:45 – Updated: 2026-04-24 18:04
VLAI
Title
lxml: Default configuration of iterparse() and ETCompatXMLParser() allows XXE to local files
Summary
lxml is a library for processing XML and HTML in the Python language. Prior to 6.1.0, using either of the two parsers in the default configuration (with resolve_entities=True) allows untrusted XML input to read local files. Setting the resolve_entities option explicitly to resolve_entities='internal' or resolve_entities=False disables the local file access. This vulnerability is fixed in 6.1.0.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-611 - Improper Restriction of XML External Entity Reference
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/lxml/lxml/security/advisories/… | x_refsource_CONFIRM |
| https://bugs.launchpad.net/lxml/+bug/2146291 | x_refsource_MISC |
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CVE-2022-2309 (GCVE-0-2022-2309)
Vulnerability from nvd – Published: 2022-07-05 09:00 – Updated: 2025-11-04 16:09
VLAI
Title
NULL Pointer Dereference in lxml/lxml
Summary
NULL Pointer Dereference allows attackers to cause a denial of service (or application crash). This only applies when lxml is used together with libxml2 2.9.10 through 2.9.14. libxml2 2.9.9 and earlier are not affected. It allows triggering crashes through forged input data, given a vulnerable code sequence in the application. The vulnerability is caused by the iterwalk function (also used by the canonicalize function). Such code shouldn't be in wide-spread use, given that parsing + iterwalk would usually be replaced with the more efficient iterparse function. However, an XML converter that serialises to C14N would also be vulnerable, for example, and there are legitimate use cases for this code sequence. If untrusted input is received (also remotely) and processed via iterwalk function, a crash can be triggered.
Severity
5.3 (Medium)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://huntr.dev/bounties/8264e74f-edda-4c40-995… | x_refsource_CONFIRM |
| https://github.com/lxml/lxml/commit/86368e9cf70a0… | x_refsource_MISC |
| https://security.gentoo.org/glsa/202208-06 | vendor-advisoryx_refsource_GENTOO |
| https://security.netapp.com/advisory/ntap-2022091… | x_refsource_CONFIRM |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.debian.org/debian-lts-announce/2024… |
Impacted products
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CVE-2021-43818 (GCVE-0-2021-43818)
Vulnerability from nvd – Published: 2021-12-13 18:05 – Updated: 2025-12-18 15:05
VLAI
Title
HTML Cleaner allows crafted and SVG embedded scripts to pass through
Summary
lxml is a library for processing XML and HTML in the Python language. Prior to version 4.6.5, the HTML Cleaner in lxml.html lets certain crafted script content pass through, as well as script content in SVG files embedded using data URIs. Users that employ the HTML cleaner in a security relevant context should upgrade to lxml 4.6.5 to receive a patch. There are no known workarounds available.
Severity
8.2 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
14 references
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CVE-2021-28957 (GCVE-0-2021-28957)
Vulnerability from nvd – Published: 2021-03-21 04:39 – Updated: 2025-12-17 21:31
VLAI
Summary
An XSS vulnerability was discovered in python-lxml's clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
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| URL | Tags |
|---|---|
| https://bugs.launchpad.net/lxml/+bug/1888153 | x_refsource_MISC |
| https://github.com/lxml/lxml/pull/316/commits/10e… | x_refsource_MISC |
| https://lists.debian.org/debian-lts-announce/2021… | mailing-listx_refsource_MLIST |
| https://www.debian.org/security/2021/dsa-4880 | vendor-advisoryx_refsource_DEBIAN |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://www.oracle.com/security-alerts/cpuoct2021.html | x_refsource_MISC |
| https://github.com/lxml/lxml/commit/a5f9cb52079dc… | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2021052… | x_refsource_CONFIRM |
| https://security.gentoo.org/glsa/202208-06 | vendor-advisoryx_refsource_GENTOO |
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CVE-2020-27783 (GCVE-0-2020-27783)
Vulnerability from nvd – Published: 2020-12-03 16:39 – Updated: 2025-12-17 21:02
VLAI
Summary
A XSS vulnerability was discovered in python-lxml's clean module. The module's parser didn't properly imitate browsers, which caused different behaviors between the sanitizer and the user's page. A remote attacker could exploit this flaw to run arbitrary HTML/JS code.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1901633 | x_refsource_MISC |
| https://www.debian.org/security/2020/dsa-4810 | vendor-advisoryx_refsource_DEBIAN |
| https://lists.debian.org/debian-lts-announce/2020… | mailing-listx_refsource_MLIST |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://www.oracle.com//security-alerts/cpujul2021.html | x_refsource_MISC |
| https://advisory.checkmarx.net/advisory/CX-2020-4286 | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2021052… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | python-lxml |
Affected:
lxml-4.6.2
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CVE-2018-19787 (GCVE-0-2018-19787)
Vulnerability from nvd – Published: 2018-12-02 10:00 – Updated: 2025-12-18 15:15
VLAI
Summary
An issue was discovered in lxml before 4.2.5. lxml/html/clean.py in the lxml.html.clean module does not remove javascript: URLs that use escaping, allowing a remote attacker to conduct XSS attacks, as demonstrated by "j a v a s c r i p t:" in Internet Explorer. This is a similar issue to CVE-2014-3146.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://usn.ubuntu.com/3841-1/ | vendor-advisoryx_refsource_UBUNTU |
| https://lists.debian.org/debian-lts-announce/2018… | mailing-listx_refsource_MLIST |
| https://usn.ubuntu.com/3841-2/ | vendor-advisoryx_refsource_UBUNTU |
| https://github.com/lxml/lxml/commit/6be1d081b49c9… | x_refsource_MISC |
| https://lists.debian.org/debian-lts-announce/2020… | mailing-listx_refsource_MLIST |
Date Public
2018-12-02 00:00
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CVE-2014-3146 (GCVE-0-2014-3146)
Vulnerability from nvd – Published: 2014-05-14 19:00 – Updated: 2025-12-17 21:03
VLAI
Summary
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.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
14 references
Date Public
2014-04-15 00:00
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CVE-2026-41066 (GCVE-0-2026-41066)
Vulnerability from cvelistv5 – Published: 2026-04-24 16:45 – Updated: 2026-04-24 18:04
VLAI
Title
lxml: Default configuration of iterparse() and ETCompatXMLParser() allows XXE to local files
Summary
lxml is a library for processing XML and HTML in the Python language. Prior to 6.1.0, using either of the two parsers in the default configuration (with resolve_entities=True) allows untrusted XML input to read local files. Setting the resolve_entities option explicitly to resolve_entities='internal' or resolve_entities=False disables the local file access. This vulnerability is fixed in 6.1.0.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-611 - Improper Restriction of XML External Entity Reference
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/lxml/lxml/security/advisories/… | x_refsource_CONFIRM |
| https://bugs.launchpad.net/lxml/+bug/2146291 | x_refsource_MISC |
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CVE-2022-2309 (GCVE-0-2022-2309)
Vulnerability from cvelistv5 – Published: 2022-07-05 09:00 – Updated: 2025-11-04 16:09
VLAI
Title
NULL Pointer Dereference in lxml/lxml
Summary
NULL Pointer Dereference allows attackers to cause a denial of service (or application crash). This only applies when lxml is used together with libxml2 2.9.10 through 2.9.14. libxml2 2.9.9 and earlier are not affected. It allows triggering crashes through forged input data, given a vulnerable code sequence in the application. The vulnerability is caused by the iterwalk function (also used by the canonicalize function). Such code shouldn't be in wide-spread use, given that parsing + iterwalk would usually be replaced with the more efficient iterparse function. However, an XML converter that serialises to C14N would also be vulnerable, for example, and there are legitimate use cases for this code sequence. If untrusted input is received (also remotely) and processed via iterwalk function, a crash can be triggered.
Severity
5.3 (Medium)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
7 references
| URL | Tags |
|---|---|
| https://huntr.dev/bounties/8264e74f-edda-4c40-995… | x_refsource_CONFIRM |
| https://github.com/lxml/lxml/commit/86368e9cf70a0… | x_refsource_MISC |
| https://security.gentoo.org/glsa/202208-06 | vendor-advisoryx_refsource_GENTOO |
| https://security.netapp.com/advisory/ntap-2022091… | x_refsource_CONFIRM |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.debian.org/debian-lts-announce/2024… |
Impacted products
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CVE-2021-43818 (GCVE-0-2021-43818)
Vulnerability from cvelistv5 – Published: 2021-12-13 18:05 – Updated: 2025-12-18 15:05
VLAI
Title
HTML Cleaner allows crafted and SVG embedded scripts to pass through
Summary
lxml is a library for processing XML and HTML in the Python language. Prior to version 4.6.5, the HTML Cleaner in lxml.html lets certain crafted script content pass through, as well as script content in SVG files embedded using data URIs. Users that employ the HTML cleaner in a security relevant context should upgrade to lxml 4.6.5 to receive a patch. There are no known workarounds available.
Severity
8.2 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
14 references
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CVE-2021-28957 (GCVE-0-2021-28957)
Vulnerability from cvelistv5 – Published: 2021-03-21 04:39 – Updated: 2025-12-17 21:31
VLAI
Summary
An XSS vulnerability was discovered in python-lxml's clean module versions before 4.6.3. When disabling the safe_attrs_only and forms arguments, the Cleaner class does not remove the formaction attribute allowing for JS to bypass the sanitizer. A remote attacker could exploit this flaw to run arbitrary JS code on users who interact with incorrectly sanitized HTML. This issue is patched in lxml 4.6.3.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
10 references
| URL | Tags |
|---|---|
| https://bugs.launchpad.net/lxml/+bug/1888153 | x_refsource_MISC |
| https://github.com/lxml/lxml/pull/316/commits/10e… | x_refsource_MISC |
| https://lists.debian.org/debian-lts-announce/2021… | mailing-listx_refsource_MLIST |
| https://www.debian.org/security/2021/dsa-4880 | vendor-advisoryx_refsource_DEBIAN |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://www.oracle.com/security-alerts/cpuoct2021.html | x_refsource_MISC |
| https://github.com/lxml/lxml/commit/a5f9cb52079dc… | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2021052… | x_refsource_CONFIRM |
| https://security.gentoo.org/glsa/202208-06 | vendor-advisoryx_refsource_GENTOO |
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CVE-2020-27783 (GCVE-0-2020-27783)
Vulnerability from cvelistv5 – Published: 2020-12-03 16:39 – Updated: 2025-12-17 21:02
VLAI
Summary
A XSS vulnerability was discovered in python-lxml's clean module. The module's parser didn't properly imitate browsers, which caused different behaviors between the sanitizer and the user's page. A remote attacker could exploit this flaw to run arbitrary HTML/JS code.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1901633 | x_refsource_MISC |
| https://www.debian.org/security/2020/dsa-4810 | vendor-advisoryx_refsource_DEBIAN |
| https://lists.debian.org/debian-lts-announce/2020… | mailing-listx_refsource_MLIST |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://www.oracle.com//security-alerts/cpujul2021.html | x_refsource_MISC |
| https://advisory.checkmarx.net/advisory/CX-2020-4286 | x_refsource_MISC |
| https://security.netapp.com/advisory/ntap-2021052… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| n/a | python-lxml |
Affected:
lxml-4.6.2
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CVE-2018-19787 (GCVE-0-2018-19787)
Vulnerability from cvelistv5 – Published: 2018-12-02 10:00 – Updated: 2025-12-18 15:15
VLAI
Summary
An issue was discovered in lxml before 4.2.5. lxml/html/clean.py in the lxml.html.clean module does not remove javascript: URLs that use escaping, allowing a remote attacker to conduct XSS attacks, as demonstrated by "j a v a s c r i p t:" in Internet Explorer. This is a similar issue to CVE-2014-3146.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://usn.ubuntu.com/3841-1/ | vendor-advisoryx_refsource_UBUNTU |
| https://lists.debian.org/debian-lts-announce/2018… | mailing-listx_refsource_MLIST |
| https://usn.ubuntu.com/3841-2/ | vendor-advisoryx_refsource_UBUNTU |
| https://github.com/lxml/lxml/commit/6be1d081b49c9… | x_refsource_MISC |
| https://lists.debian.org/debian-lts-announce/2020… | mailing-listx_refsource_MLIST |
Date Public
2018-12-02 00:00
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CVE-2014-3146 (GCVE-0-2014-3146)
Vulnerability from cvelistv5 – Published: 2014-05-14 19:00 – Updated: 2025-12-17 21:03
VLAI
Summary
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.
Severity
6.1 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
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Date Public
2014-04-15 00:00
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