CVE-2026-44709

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.8 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 95% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
4.7%
KEV
Not listed

Published

May 27, 2026

Last Modified

June 2, 2026

Advisory Details (1)

Auto-updated Jun 3, 2026
Patch available. Sources: github.
github Patch Available

PINENTRY_FALLBACK_APP environment variable allows arbitrary command execution; keyring password exposed in process arguments · Advisory · mcdope/pam_usb · GitHub

https://github.com/mcdope/pam_usb/security/advisories/GHSA-jxrj-q67x-wr4c

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 49× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 112 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
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  1. 2026-06-27 18:23 UTCEG score recompute
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  20. 2026-06-17 20:48 UTCEG score recompute
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  27. 2026-06-15 17:49 UTCEPSS rescore
  28. 2026-06-15 13:16 UTCEG score recompute
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  72. 2026-06-02 20:13 UTCEPSS rescore
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  74. 2026-06-01 23:43 UTCEG score recompute
  75. 2026-06-01 13:52 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-44709?
CVE-2026-44709 is a high vulnerability published on May 27, 2026. pamusb provides hardware authentication for Linux using ordinary removable media. Prior to 0.8.7, pamusb-pinentry reads the PINENTRYFALLBACKAPP environment variable and executes it directly without any validation. Any process that can set environment variables before pamusb-pinentry is invoked can…
When was CVE-2026-44709 disclosed?
CVE-2026-44709 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on June 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44709 actively exploited?
CVE-2026-44709 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-44709?
CVE-2026-44709 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-44709?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44709, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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