{"id":"OESA-2021-1178","summary":"python-lxml security update","details":"The lxml XML toolkit is a Pythonic binding for the C libraries libxml2 and libxslt. It is unique in that it combines the speed and XML feature completeness of these libraries with the simplicity of a native Python API, mostly compatible but superior to the well-known ElementTree API. The latest release works with all CPython versions from 2.7 to 3.7.\r\n\r\nSecurity Fix(es):\r\n\r\nAn 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)","modified":"2026-08-18T01:15:10.033464063Z","published":"2021-05-06T11:04:25Z","upstream":["CVE-2021-28957"],"database_specific":{"severity":"Medium"},"references":[{"type":"ADVISORY","url":"https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1178"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-28957"}],"affected":[{"package":{"name":"python-lxml","ecosystem":"openEuler:20.03-LTS-SP1","purl":"pkg:rpm/openEuler/python-lxml&distro=openEuler-20.03-LTS-SP1"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.5.2-3.oe1"}]}],"ecosystem_specific":{"src":["python-lxml-4.5.2-3.oe1.src.rpm"],"x86_64":["python3-lxml-4.5.2-3.oe1.x86_64.rpm","python2-lxml-4.5.2-3.oe1.x86_64.rpm","python-lxml-debugsource-4.5.2-3.oe1.x86_64.rpm","python-lxml-debuginfo-4.5.2-3.oe1.x86_64.rpm"],"aarch64":["python-lxml-debugsource-4.5.2-3.oe1.aarch64.rpm","python2-lxml-4.5.2-3.oe1.aarch64.rpm","python-lxml-debuginfo-4.5.2-3.oe1.aarch64.rpm","python3-lxml-4.5.2-3.oe1.aarch64.rpm"],"noarch":["python-lxml-help-4.5.2-3.oe1.noarch.rpm"]},"database_specific":{"source":"https://repo.openeuler.org/security/data/osv/OESA-2021-1178.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"}]}