Is CVE-2026-48064 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-48064 being exploited in the wild.

How severe is CVE-2026-48064?

High severity, with a CVSS score of 8.1, published 27 May 2026.

Is there a fix for CVE-2026-48064?

A patch was published on 2026-05-27: Fixed in version 0.9.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-48064 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-48064?

Check whether you run Mcdope Pam Usb at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-48064: mcdope pam_usb incorrect authorization in remote host check

CVE-2026-48064 · Severity: high · CVSS 8.1 · Published 2026-05-27

pam_usb is a tool that allows users to log into Linux systems using a physical USB drive as a security key. A flaw in how it handles remote connections allows attackers to bypass security checks that are supposed to ensure the user is physically present at the machine. If a system is configured to allow remote logins (such as via XDMCP), an attacker with a stolen or cloned USB device could potentially log in remotely, bypassing the intended physical security requirement.

Technologies: Mcdope Pam Usb. Vendors: Mcdope.

Quick answers

Is CVE-2026-48064 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-48064 being exploited in the wild.
How severe is CVE-2026-48064?: High severity, with a CVSS score of 8.1, published 27 May 2026.
Which products and versions are affected?: Mcdope Pam Usb < 0.9.1.
Is there a fix for CVE-2026-48064?: A patch was published on 2026-05-27: Fixed in version 0.9.1 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-48064 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-48064?: Check whether you run Mcdope Pam Usb at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

In pam_usb versions prior to 0.9.1, the PAM_RHOST check in the pusb_do_auth() function is incorrectly nested within a conditional block that only executes if 'deny_remote' is enabled. When 'deny_remote' is set to false (a common configuration for display managers like GDM or LightDM to avoid local TTY heuristic issues), the module fails to verify if the connection is originating from a remote host. This allows remote daemons that set PAM_RHOST, such as XDMCP or SSH, to proceed to the USB device authentication phase instead of being rejected. An attacker possessing a valid USB token and user credentials could exploit this to gain remote access to systems that were intended to only allow local USB-based logins. The issue is resolved in version 0.9.1 by decoupling the PAM_RHOST check from the 'deny_remote' configuration option.

Affected products

mcdope pam_usb < 0.9.1

Timeline

2026-05-19: other: Issue first reported on GitHub
2026-05-23: advisory: Project maintainer published security advisory GHSA-w38v-cw9r-x9p6
2026-05-27: disclosed: CVE-2026-48064 published
2026-05-27: patched: Fixed in version 0.9.1

References

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