CVE-2026-120306 Beta9 - Privilege Escalation

Beta9 worker < 0.1.756 contains a privilege escalation caused by Buildah RUN steps executing with shared namespaces and CAP_DAC_OVERRIDE, letting tenant users escalate privileges by accessing the worker container filesystem, exploit requires tenant workspace token.

CVSS base score 9.9 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.36% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Privilege Escalation
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
1 November 2026
Updated
3 November 2026
Weakness
CWE-269

Vendor fix

Update to worker version 0.1.756 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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