CVE-2026-47272

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Source

https://cve.org/CVERecord?id=CVE-2026-47272

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47272.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-47272

Aliases

GHSA-vx6f-rrqr-j87c

Published

2026-05-27T20:06:15.388Z

Modified

2026-07-22T00:02:54.896911Z

Severity

7.1 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N CVSS Calculator

Summary

pam_usb: OTP pad authentication bypass via missing system pad check and uninitialized RNG buffer

Details

pamusb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, the pusbpad_compare() function in src/pad.c only verified that the user-side pad (~/.pamusb/device.pad) could be read, but did not enforce that the system-side pad (the pad file on the USB device) was also present and readable. If the user-side pad was deleted or unreadable, the function returned a failure that was treated as non-fatal in certain code paths, allowing authentication to succeed without the USB device being verified. A local user can delete their own ~/.pamusb/device.pad to remove the USB device requirement and authenticate without the physical device. This vulnerability is fixed in 0.9.0.

Database specific

{
    "cwe_ids": [
        "CWE-287",
        "CWE-908"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47272.json",
    "cna_assigner": "GitHub_M"
}

References

Affected packages

Git / github.com/mcdope/pam_usb

Affected ranges

Type

GIT

Repo

https://github.com/mcdope/pam_usb

Events

Introduced

Fixed

c1eba240c30dc377619492affca6f0c130e4fa9e

Database specific

{
    "source": "AFFECTED_FIELD",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.9.0"
        }
    ]
}

Affected versions

0.*

0.5.0

0.7.1

0.7.2

0.7.3

0.8.3

0.8.4

0.8.7

v0.*

v0.7.0

v0.8.0

Database specific

vanir_signatures_modified

"2026-07-22T00:02:54Z"

vanir_signatures

[
    {
        "signature_type": "Line",
        "target": {
            "file": "src/version.h"
        },
        "deprecated": false,
        "source": "https://github.com/mcdope/pam_usb/commit/c1eba240c30dc377619492affca6f0c130e4fa9e",
        "id": "CVE-2026-47272-10178184",
        "signature_version": "v1",
        "digest": {
            "line_hashes": [
                "206666566369348414222264955120073332973"
            ],
            "threshold": 0.9
        }
    }
]

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47272.json"