← All notices | Source (USN-8787-1) | Text version

QSN-8787-1: libxml2 vulnerabilities

September 21, 2026

Summary

Several security issues were fixed in libxml2.

Details

It was discovered that libxml2 incorrectly handled certain XML elements under certain circumstances. An attacker could possibly use this issue to cause libxml2 to crash or execute arbitrary code. (CVE-2026-86140)

It was discovered that libxml2 incorrectly handled certain XML documents when used with Python bindings. A remote attacker could possibly use this issue to cause applications using libxml2 to crash, resulting in a denial of service. (CVE-2026-74860)

Affected QuantaStor releases

ReleasePlatformPackageExposureShipped versionFixed versionStatus
6.9.1.001Ubuntu 22.04 LTSlibxml2Externally-facing2.9.13+dfsg-1ubuntu0.142.9.13+dfsg-1ubuntu0.13Fixed in this release
6.9.1.001Ubuntu 22.04 LTSlibxml2-utilsInternally-facing2.9.13+dfsg-1ubuntu0.142.9.13+dfsg-1ubuntu0.13Fixed in this release
6.9.0.464Ubuntu 22.04 LTSlibxml2Externally-facing2.9.13+dfsg-1ubuntu0.142.9.13+dfsg-1ubuntu0.13Fixed in this release
6.9.0.464Ubuntu 22.04 LTSlibxml2-utilsInternally-facing2.9.13+dfsg-1ubuntu0.142.9.13+dfsg-1ubuntu0.13Fixed in this release
6.8.6.015Ubuntu 22.04 LTSlibxml2Externally-facing2.9.13+dfsg-1ubuntu0.122.9.13+dfsg-1ubuntu0.13Fixed by QuantaStor security update
6.8.6.015Ubuntu 22.04 LTSlibxml2-utilsInternally-facing2.9.13+dfsg-1ubuntu0.122.9.13+dfsg-1ubuntu0.13Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSlibxml2Externally-facing2.9.13+dfsg-1ubuntu0.122.9.13+dfsg-1ubuntu0.13Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSlibxml2-utilsInternally-facing2.9.13+dfsg-1ubuntu0.122.9.13+dfsg-1ubuntu0.13Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSlibxml2Externally-facing2.9.13+dfsg-1ubuntu0.122.9.13+dfsg-1ubuntu0.13Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSlibxml2-utilsInternally-facing2.9.13+dfsg-1ubuntu0.122.9.13+dfsg-1ubuntu0.13Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSlibxml2Externally-facing2.9.13+dfsg-1ubuntu0.122.9.13+dfsg-1ubuntu0.13Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSlibxml2-utilsInternally-facing2.9.13+dfsg-1ubuntu0.122.9.13+dfsg-1ubuntu0.13Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSlibxml2Externally-facing2.9.13+dfsg-1ubuntu0.122.9.13+dfsg-1ubuntu0.13Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSlibxml2-utilsInternally-facing2.9.13+dfsg-1ubuntu0.122.9.13+dfsg-1ubuntu0.13Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSlibxml2Externally-facing2.9.13+dfsg-1ubuntu0.122.9.13+dfsg-1ubuntu0.13Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSlibxml2-utilsInternally-facing2.9.13+dfsg-1ubuntu0.122.9.13+dfsg-1ubuntu0.13Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSlibxml2Externally-facing2.9.13+dfsg-1ubuntu0.122.9.13+dfsg-1ubuntu0.13Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSlibxml2-utilsInternally-facing2.9.13+dfsg-1ubuntu0.122.9.13+dfsg-1ubuntu0.13Fixed 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-2026-86140, CVE-2026-74860

References

https://ubuntu.com/security/notices/USN-8787-1

https://nvd.nist.gov/vuln/detail/CVE-2026-86140

https://nvd.nist.gov/vuln/detail/CVE-2026-74860

Update

Fixes marked Fixed by QuantaStor security update are applied by upgrading QuantaStor with security patches included (Upgrade Manager). Fixed package versions:

PlatformPackageVersion
bioniclibxml22.9.4+dfsg1-6.1ubuntu1.9+esm8
Ubuntu 20.04 LTSlibxml22.9.10+dfsg-5ubuntu0.20.04.10+esm5
Ubuntu 22.04 LTSlibxml22.9.13+dfsg-1ubuntu0.13
Ubuntu 24.04 LTSlibxml22.9.14+dfsg-1.3ubuntu3.9
resolutelibxml22.15.2+dfsg-0.1ubuntu0.2
trustylibxml22.9.1+dfsg1-3ubuntu4.13+esm12
xeniallibxml22.9.3+dfsg1-1ubuntu0.7+esm13