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
2026-05-27T20:06:15Z
Modified
2026-10-28T11:11:17Z
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

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, the pusb_pad_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 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-287",
        "CWE-908"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47272.json"
}
References

Affected packages

Git / github.com/mcdope/pam_usb

Affected ranges

Type
GIT
Repo
https://github.com/mcdope/pam_usb
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
c1eba240c30dc377619492affca6f0c130e4fa9e
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "0.9.0"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "0.9.0"
                }
            ],
            "source":  "DESCRIPTION"
        }
    ]
}

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

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-47272.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "206666566369348414222264955120073332973"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-47272-10178184",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/mcdope/pam_usb/commit/c1eba240c30dc377619492affca6f0c130e4fa9e",
        "target":  {
            "file":  "src/version.h"
        }
    }
]
vanir_signatures_modified 
"2026-10-28T11:11:17Z"