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QSN-8897-1: lxml vulnerabilities
October 7, 2026
Summary
Several security issues were fixed in lxml.
Details
Guillem Lefait discovered that lxml incorrectly handled certain URL attributes. A remote attacker could possibly use this issue to bypass URL sanitization, leading to a cross-site scripting attack. (CVE-2026-49825)
Qiu Sihao discovered that lxml incorrectly handled untrusted XML input. A remote attacker could possibly use this issue to read local files and expose sensitive information. This issue was only addressed in Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-41066)
Affected QuantaStor releases
| Release | Platform | Package | Exposure | Shipped version | Fixed version | Status |
|---|---|---|---|---|---|---|
| 6.9.1.001 | Ubuntu 22.04 LTS | python3-lxml | Externally-facing | 4.8.0-1ubuntu0.1 | 4.8.0-1ubuntu0.1 | Fixed in this release |
| 6.9.0.464 | Ubuntu 22.04 LTS | python3-lxml | Externally-facing | 4.8.0-1ubuntu0.1 | 4.8.0-1ubuntu0.1 | Fixed in this release |
| 6.8.6.015 | Ubuntu 22.04 LTS | python3-lxml | Externally-facing | 4.8.0-1build1 | 4.8.0-1ubuntu0.1 | Fixed by QuantaStor security update |
| 6.8.5.018 | Ubuntu 22.04 LTS | python3-lxml | Externally-facing | 4.8.0-1build1 | 4.8.0-1ubuntu0.1 | Fixed by QuantaStor security update |
| 6.8.4.038 | Ubuntu 22.04 LTS | python3-lxml | Externally-facing | 4.8.0-1build1 | 4.8.0-1ubuntu0.1 | Fixed by QuantaStor security update |
| 6.8.3.018 | Ubuntu 22.04 LTS | python3-lxml | Externally-facing | 4.8.0-1build1 | 4.8.0-1ubuntu0.1 | Fixed by QuantaStor security update |
| 6.8.2.002 | Ubuntu 22.04 LTS | python3-lxml | Externally-facing | 4.8.0-1build1 | 4.8.0-1ubuntu0.1 | Fixed by QuantaStor security update |
| 6.8.1.007 | Ubuntu 22.04 LTS | python3-lxml | Externally-facing | 4.8.0-1build1 | 4.8.0-1ubuntu0.1 | Fixed by QuantaStor security update |
| 6.8.0.205 | Ubuntu 22.04 LTS | python3-lxml | Externally-facing | 4.8.0-1build1 | 4.8.0-1ubuntu0.1 | Fixed by QuantaStor security update |
Internally-facing: only accessible when logged into the QuantaStor console/ssh as the qadmin administrative sudo user; generally lower priority. Externally-facing: part of a service the storage platform presents on the network (or the kernel), so potentially reachable over the network.
CVEs
CVE-2026-41066, CVE-2026-49825
References
https://ubuntu.com/security/notices/USN-8897-1
https://nvd.nist.gov/vuln/detail/CVE-2026-41066
https://nvd.nist.gov/vuln/detail/CVE-2026-49825
Update
Fixes marked Fixed by QuantaStor security update are applied by upgrading QuantaStor with security patches included (Upgrade Manager). Fixed package versions:
| Platform | Package | Version |
|---|---|---|
| bionic | lxml | 4.2.1-1ubuntu0.6+esm1 |
| Ubuntu 20.04 LTS | lxml | 4.5.0-1ubuntu0.5+esm1 |
| Ubuntu 22.04 LTS | lxml | 4.8.0-1ubuntu0.1 |
| Ubuntu 24.04 LTS | lxml | 5.2.1-1ubuntu0.2 |
| resolute | lxml | 6.0.2-1ubuntu0.1 |
| trusty | lxml | 3.3.3-1ubuntu0.2+esm6 |
| xenial | lxml | 3.5.0-1ubuntu0.4+esm3 |