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Debian LTS Advisory DLA-4799-1 debian-lts@lists.debian.org
https://www.debian.org/lts/security/ Guilhem Moulin
September 28, 2026 https://wiki.debian.org/LTS
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Package : lxml
Version : 4.9.2-1+deb12u1
CVE ID : CVE-2026-28348 CVE-2026-28350 CVE-2026-41066 CVE-2026-49825
Multiple vulnerabilities were discovered in lxml, a set pythonic binding
for the libxml2 and libxslt libraries, which may lead to information
disclosure or privilege escalation.
CVE-2026-28348
The CSS @import filter is prone to bypass via unicode escapes.
CVE-2026-28350
The default `Cleaner` configuration is prone to <base> tag
injection, thereby allowing an attacker to hijack relative links on
the page.
CVE-2026-41066
Qiu Sihao discovered that the default configuration of iterparse()
and ETCompatXMLParser() allows XML External Entity attacks to local
files, which may lead to information disclosure.
CVE-2026-49825
Guillem Lefait discovered that the Cleaner module fails to strip
`javascript:` URLs from namespaced URL attributes (xlink:href).
For Debian 12 bookworm, these problems have been fixed in version
4.9.2-1+deb12u1.
We recommend that you upgrade your lxml packages.
For the detailed security status of lxml please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/lxml
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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