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EPSS 0.1%top 99%

A flaw was found in libvirt. During storage volume clone or convert operations, newly created volume images were temporarily world-readable. (CVE-2026-63623)

0
Medium
VulnerabilityCVE-2026-63623gcveosvubuntu-cve-2026-63623cve-2026-63623ubuntu-pro-14-04-ltsubuntu-pro-16-04-ltsubuntu-pro-18-04-ltsubuntu-pro-20-04-ltsubuntu-22-04-ltsubuntu-24-04-ltsubuntu-26-04-lts
Published: 08/10/2026 (08/10/2026, 17:17:00 UTC)
Source: GCVE Database
Product: libvirt

Description

A flaw was found in libvirt. During storage volume clone or convert operations, newly created volume images were temporarily world-readable. This was caused by the `qemu-img` utility running with overly permissive file creation settings, allowing any local user to read the full guest disk contents. This vulnerability could lead to sensitive information disclosure from guest virtual machines.

CVSS v3.1

Score 5.5medium

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected software

Ubuntu:Pro:14.04:LTSmore threats →ghsa
libvirt
pkg:deb/ubuntu/libvirt?arch=source&distro=esm-infra-legacy/trusty
Affected versions
<1.2.2-0ubuntu13.1.28+esm2=1.1.1-0ubuntu8=1.1.1-0ubuntu9=1.1.4-0ubuntu2=1.1.4-0ubuntu3=1.1.4-0ubuntu4=1.1.4-0ubuntu5=1.2.0-0ubuntu1=1.2.0-0ubuntu2=1.2.0-0ubuntu3=1.2.1-0ubuntu1=1.2.1-0ubuntu2=1.2.1-0ubuntu3=1.2.1-0ubuntu4=1.2.1-0ubuntu5=1.2.1-0ubuntu7=1.2.1-0ubuntu8=1.2.1-0ubuntu9=1.2.1-0ubuntu10=1.2.2-0ubuntu1=1.2.2-0ubuntu2=1.2.2-0ubuntu3=1.2.2-0ubuntu4=1.2.2-0ubuntu5=1.2.2-0ubuntu6=1.2.2-0ubuntu7=1.2.2-0ubuntu8=1.2.2-0ubuntu9=1.2.2-0ubuntu10=1.2.2-0ubuntu11=1.2.2-0ubuntu12=1.2.2-0ubuntu13=1.2.2-0ubuntu13.1=1.2.2-0ubuntu13.1.1=1.2.2-0ubuntu13.1.2=1.2.2-0ubuntu13.1.4=1.2.2-0ubuntu13.1.5=1.2.2-0ubuntu13.1.6=1.2.2-0ubuntu13.1.7=1.2.2-0ubuntu13.1.8=1.2.2-0ubuntu13.1.9=1.2.2-0ubuntu13.1.10=1.2.2-0ubuntu13.1.12=1.2.2-0ubuntu13.1.14=1.2.2-0ubuntu13.1.16=1.2.2-0ubuntu13.1.17=1.2.2-0ubuntu13.1.20=1.2.2-0ubuntu13.1.21=1.2.2-0ubuntu13.1.22=1.2.2-0ubuntu13.1.23=1.2.2-0ubuntu13.1.25=1.2.2-0ubuntu13.1.26=1.2.2-0ubuntu13.1.27=1.2.2-0ubuntu13.1.28=1.2.2-0ubuntu13.1.28+esm1
Ubuntu:Pro:16.04:LTSmore threats →ghsa
libvirt
pkg:deb/ubuntu/libvirt?arch=source&distro=esm-infra-legacy/xenial
Affected versions
<1.3.1-1ubuntu10.31+esm1=1.2.16-2ubuntu11=1.2.16-2ubuntu12=1.2.16-2ubuntu13=1.2.16-2ubuntu14=1.2.21-2ubuntu1=1.2.21-2ubuntu3=1.2.21-2ubuntu4=1.2.21-2ubuntu5=1.2.21-2ubuntu7=1.2.21-2ubuntu8=1.2.21-2ubuntu9=1.2.21-2ubuntu10=1.3.1-1ubuntu1=1.3.1-1ubuntu2=1.3.1-1ubuntu3=1.3.1-1ubuntu4=1.3.1-1ubuntu6=1.3.1-1ubuntu9=1.3.1-1ubuntu10=1.3.1-1ubuntu10.1=1.3.1-1ubuntu10.2=1.3.1-1ubuntu10.3=1.3.1-1ubuntu10.5=1.3.1-1ubuntu10.6=1.3.1-1ubuntu10.7=1.3.1-1ubuntu10.8=1.3.1-1ubuntu10.10=1.3.1-1ubuntu10.11=1.3.1-1ubuntu10.12=1.3.1-1ubuntu10.13=1.3.1-1ubuntu10.14=1.3.1-1ubuntu10.15=1.3.1-1ubuntu10.17=1.3.1-1ubuntu10.18=1.3.1-1ubuntu10.19=1.3.1-1ubuntu10.21=1.3.1-1ubuntu10.22=1.3.1-1ubuntu10.23=1.3.1-1ubuntu10.24=1.3.1-1ubuntu10.25=1.3.1-1ubuntu10.26=1.3.1-1ubuntu10.27=1.3.1-1ubuntu10.29=1.3.1-1ubuntu10.30=1.3.1-1ubuntu10.31
Ubuntu:Pro:18.04:LTSmore threats →ghsa
libvirt
pkg:deb/ubuntu/libvirt?arch=source&distro=esm-infra/bionic
Affected versions
<4.0.0-1ubuntu8.21+esm1=3.6.0-1ubuntu5=3.6.0-1ubuntu6=4.0.0-1ubuntu1=4.0.0-1ubuntu2=4.0.0-1ubuntu3=4.0.0-1ubuntu4=4.0.0-1ubuntu5=4.0.0-1ubuntu6=4.0.0-1ubuntu7=4.0.0-1ubuntu8=4.0.0-1ubuntu8.1=4.0.0-1ubuntu8.2=4.0.0-1ubuntu8.3=4.0.0-1ubuntu8.4=4.0.0-1ubuntu8.5=4.0.0-1ubuntu8.6=4.0.0-1ubuntu8.7=4.0.0-1ubuntu8.8=4.0.0-1ubuntu8.9=4.0.0-1ubuntu8.10=4.0.0-1ubuntu8.11=4.0.0-1ubuntu8.12=4.0.0-1ubuntu8.13=4.0.0-1ubuntu8.14=4.0.0-1ubuntu8.15=4.0.0-1ubuntu8.16=4.0.0-1ubuntu8.17=4.0.0-1ubuntu8.19=4.0.0-1ubuntu8.20=4.0.0-1ubuntu8.21
Ubuntu:Pro:20.04:LTSmore threats →ghsa
libvirt
pkg:deb/ubuntu/libvirt?arch=source&distro=esm-infra/focal
Affected versions
<6.0.0-0ubuntu8.20+esm1=5.4.0-0ubuntu5=6.0.0-0ubuntu1=6.0.0-0ubuntu2=6.0.0-0ubuntu3=6.0.0-0ubuntu4=6.0.0-0ubuntu5=6.0.0-0ubuntu6=6.0.0-0ubuntu7=6.0.0-0ubuntu8=6.0.0-0ubuntu8.1=6.0.0-0ubuntu8.2=6.0.0-0ubuntu8.3=6.0.0-0ubuntu8.4=6.0.0-0ubuntu8.5=6.0.0-0ubuntu8.7=6.0.0-0ubuntu8.8=6.0.0-0ubuntu8.9=6.0.0-0ubuntu8.10=6.0.0-0ubuntu8.11=6.0.0-0ubuntu8.12=6.0.0-0ubuntu8.13=6.0.0-0ubuntu8.14=6.0.0-0ubuntu8.15=6.0.0-0ubuntu8.16=6.0.0-0ubuntu8.19=6.0.0-0ubuntu8.20
Ubuntu:22.04:LTSmore threats →ghsa
libvirt
pkg:deb/ubuntu/libvirt?arch=source&distro=jammy
Affected versions
<8.0.0-1ubuntu7.19=7.6.0-0ubuntu1=7.6.0-0ubuntu3=8.0.0-1ubuntu3=8.0.0-1ubuntu4=8.0.0-1ubuntu5=8.0.0-1ubuntu6=8.0.0-1ubuntu7=8.0.0-1ubuntu7.1=8.0.0-1ubuntu7.2=8.0.0-1ubuntu7.3=8.0.0-1ubuntu7.4=8.0.0-1ubuntu7.5=8.0.0-1ubuntu7.6=8.0.0-1ubuntu7.7=8.0.0-1ubuntu7.8=8.0.0-1ubuntu7.9=8.0.0-1ubuntu7.10=8.0.0-1ubuntu7.11=8.0.0-1ubuntu7.12=8.0.0-1ubuntu7.13=8.0.0-1ubuntu7.14=8.0.0-1ubuntu7.15=8.0.0-1ubuntu7.16=8.0.0-1ubuntu7.17=8.0.0-1ubuntu7.18
Ubuntu:24.04:LTSmore threats →ghsa
libvirt
pkg:deb/ubuntu/libvirt?arch=source&distro=noble
Affected versions
<10.0.0-2ubuntu8.16=9.6.0-1ubuntu1=9.6.0-1ubuntu2=10.0.0-1ubuntu1=10.0.0-2ubuntu1=10.0.0-2ubuntu5=10.0.0-2ubuntu7=10.0.0-2ubuntu8=10.0.0-2ubuntu8.1=10.0.0-2ubuntu8.2=10.0.0-2ubuntu8.3=10.0.0-2ubuntu8.4=10.0.0-2ubuntu8.5=10.0.0-2ubuntu8.6=10.0.0-2ubuntu8.7=10.0.0-2ubuntu8.8=10.0.0-2ubuntu8.9=10.0.0-2ubuntu8.10=10.0.0-2ubuntu8.11=10.0.0-2ubuntu8.12=10.0.0-2ubuntu8.13=10.0.0-2ubuntu8.14=10.0.0-2ubuntu8.15
Ubuntu:26.04:LTSmore threats →ghsa
libvirt
pkg:deb/ubuntu/libvirt?arch=source&distro=resolute
Affected versions
<12.0.0-1ubuntu5.3=11.6.0-1ubuntu3=11.6.0-1ubuntu5=11.6.0-1ubuntu6=11.6.0-1ubuntu7=11.6.0-1ubuntu8=12.0.0-1ubuntu3=12.0.0-1ubuntu5=12.0.0-1ubuntu5.1=12.0.0-1ubuntu5.2

Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.

Technical Details

Gcve Source
db.gcve.eu
Osv Id
UBUNTU-CVE-2026-63623
Osv Schema Version
1.7.0
Aliases
[]
Ecosystems
["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.04:LTS"]
Database Specific Severity
null
Cvss Version
3.1

Patch Information

Threat ID: 6a870a76acd9273b49b58b08

Added to database: 08/20/2026, 14:08:54 UTC

Last updated: 08/20/2026, 22:52:14 UTC

Views: 4

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