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CVE-2026-44709

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.8.7, pamusb-pinentry reads the PINENTRY_FALLBACK_APP environment variable and executes it directly without any validation. Any process that can set environment variables before pamusb-pinentry is invoked can point PINENTRY_FALLBACK_APP at an arbitrary binary or script and have it executed with the privileges of the pam_usb tool chain. This vulnerability is fixed in 0.8.7.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:eecdc0c5509546f04ef5ca416c97a8243f8e91030ccac3ceffd004822caeb5b0
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"pam_usb","vendor":"mcdope","versions":[{"status":"affected","version":"< 0.8.7"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:69648ba81359d6c51695dca65cfd17f946edbd49a0363f0f65280da6e04b0a7d · sha256:aca54d2099358691… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:69648ba81359d6c51695dca65cfd17f946edbd49a0363f0f65280da6e04b0a7d · sha256:aca54d2099358691… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-78","description":"CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:69648ba81359d6c51695dca65cfd17f946edbd49a0363f0f65280da6e04b0a7d · sha256:aca54d2099358691… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/mcdope/pam_usb/security/advisories/GHSA-jxrj-q67x-wr4c","tags":["x_refsource_CONFIRM"],"url":"https://github.com/mcdope/pam_usb/security/advisories/GHSA-jxrj-q67x-wr4c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:69648ba81359d6c51695dca65cfd17f946edbd49a0363f0f65280da6e04b0a7d · sha256:aca54d2099358691… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/mcdope/pam_usb/security/advisories/GHSA-jxrj-q67x-wr4c"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:69648ba81359d6c51695dca65cfd17f946edbd49a0363f0f65280da6e04b0a7d · sha256:aca54d2099358691… · /containers/adp/0/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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