CVE-2026-82636

HIGHCVSS 7.9/10EPSS 0.79%

Last modified

CVE-2026-82636 is a high-severity vulnerability rated 7.9/10 on the CVSS scale. Qubes OS before qubes-core-dom0-linux 4.3.22 allows OS command injection during a qvm-copy-to-vm call from dom0 to an attacker-controlled qube, because the "system" library function is used to process an error message that may have shell metacharacters. This occurs in core-admin-linux/file-copy-vm/qfile-dom0-agent.c.. EPSS estimates a 0.79% chance of exploitation in the next 30 days.

Description

Qubes OS before qubes-core-dom0-linux 4.3.22 allows OS command injection during a qvm-copy-to-vm call from dom0 to an attacker-controlled qube, because the "system" library function is used to process an error message that may have shell metacharacters. This occurs in core-admin-linux/file-copy-vm/qfile-dom0-agent.c.

Metrics

CVSS 3.1
7.9/10

CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS Probability
0.79%

53.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
Qubes OSQubes OS< qubes-core-dom0-linux 4.3.22

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-82636?
Qubes OS before qubes-core-dom0-linux 4.3.22 allows OS command injection during a qvm-copy-to-vm call from dom0 to an attacker-controlled qube, because the "system" library function is used to process an error message that may have shell metacharacters. This occurs in core-admin-linux/file-copy-vm/qfile-dom0-agent.c.
How severe is CVE-2026-82636?
CVE-2026-82636 has a CVSS score of 7.9/10 (HIGH severity). The EPSS model estimates a 0.79% probability of exploitation in the next 30 days.
How do I fix CVE-2026-82636?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST