VulnerableCode Package Details - pkg:deb/debian/lxml@4.6.3%2Bdfsg-0.1%2Bdeb11u1

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Vulnerability	Summary	Fixed by
VCID-9ym4-6av7-aqe3 Aliases: CVE-2022-2309 GHSA-wrxv-2j5q-m38w PYSEC-2022-230	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.	4.9.2-1 Affected by 0 other vulnerabilities.

Vulnerability

Summary

Fixed by

VCID-9ym4-6av7-aqe3
Aliases:
CVE-2022-2309
GHSA-wrxv-2j5q-m38w
PYSEC-2022-230

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.

4.9.2-1
Affected by 0 other vulnerabilities.

Vulnerability	Summary	Aliases
VCID-6tqt-q9px-1ka6	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.	CVE-2021-43818 GHSA-55x5-fj6c-h6m8 PYSEC-2021-852
VCID-fy7w-e8zj-hyas	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.	CVE-2021-28957 GHSA-jq4v-f5q6-mjqq PYSEC-2021-19
VCID-kk16-5uu2-puc2	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.	CVE-2020-27783 GHSA-pgww-xf46-h92r PYSEC-2020-62

Vulnerability

Summary

Aliases

VCID-6tqt-q9px-1ka6

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.

CVE-2021-43818
GHSA-55x5-fj6c-h6m8
PYSEC-2021-852

VCID-fy7w-e8zj-hyas

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.

CVE-2021-28957
GHSA-jq4v-f5q6-mjqq
PYSEC-2021-19

VCID-kk16-5uu2-puc2

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.

CVE-2020-27783
GHSA-pgww-xf46-h92r
PYSEC-2020-62

Date	Actor	Action	Vulnerability	Source	VulnerableCode Version
2025-08-01T19:36:49.453986+00:00	Debian Oval Importer	Fixing	VCID-kk16-5uu2-puc2	https://www.debian.org/security/oval/oval-definitions-bullseye.xml.bz2	37.0.0
2025-08-01T18:10:36.427079+00:00	Debian Oval Importer	Fixing	VCID-fy7w-e8zj-hyas	https://www.debian.org/security/oval/oval-definitions-bullseye.xml.bz2	37.0.0
2025-08-01T17:44:35.808271+00:00	Debian Oval Importer	Fixing	VCID-6tqt-q9px-1ka6	https://www.debian.org/security/oval/oval-definitions-bullseye.xml.bz2	37.0.0
2025-08-01T12:19:27.394456+00:00	Debian Importer	Affected by	VCID-9ym4-6av7-aqe3	https://security-tracker.debian.org/tracker/data/json	37.0.0