CVE-2026-47274

MEDIUMPre-NVD 6.36.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This medium-severity CVE scores 6.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1% (3rd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source

Also known asEUVD-2026-32651 (ENISA EUVD)Source: ENISA EUVD

6.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 6.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, multiple pam_usb helper tools resolved external binaries through the PATH environment variable rather than using absolute paths. An attacker who can influence the process environment during PAM authentication or tool execution could substitute malicious binaries. The affected tools are pamusb-check (src/tmux.c), pamusb-conf (tools/pamusb-conf), and pamusb-keyring-unlock-gnome (tools/pamusb-keyring-unlock-gnome). This vulnerability is fixed in 0.9.0.

CVSS v3
6.3
EG Score
6.3MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity63% × 45%
Impact severity (EG Severity): CVSS 6.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.1%
EPSS %ILE
3rd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.3): severity, escalated by confirmed exploitation. This CVE's 6.3 is its impact severity (EG Severity), not escalated.

EG Severity
6.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-25). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 27, 2026

Last Modified

October 26, 2026

Advisory Details (4)

Auto-updated Jun 13, 2026
Patch available. Sources: github, github_commit.
GitHub commit Patch Available

commit 993e73d8bebb (mcdope/pam_usb)

Patch available: mcdope/pam_usb 0.9.0 (contains commit 993e73d8bebb)

https://github.com/mcdope/pam_usb/commit/993e73d8bebb1d8e62677388de3402b6ec36b600
GitHub commit Patch Available

commit 52a1fd6413b7 (mcdope/pam_usb)

Patch available: mcdope/pam_usb 0.9.0 (contains commit 52a1fd6413b7)

https://github.com/mcdope/pam_usb/commit/52a1fd6413b7ffcc1a5b58ce432be42e7bf0dbd0
GitHub commit Patch Available

commit 1ee874592038 (mcdope/pam_usb)

Patch available: mcdope/pam_usb 0.9.0 (contains commit 1ee874592038)

https://github.com/mcdope/pam_usb/commit/1ee8745920388df48d001a8e61ba629071557937
GitHub advisoryMentions a patch (unverified)

Uncontrolled search path in pam_usb tools allows privilege escalation via PATH manipulation · Advisory · mcdope/pam_usb · GitHub

https://github.com/mcdope/pam_usb/security/advisories/GHSA-pp29-w28g-r9h9

Weakness Classification(1)

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

Data Freshness Timeline

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

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 203 rows on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 103 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  2. 2026-11-11 16:39 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  3. 2026-11-10 16:44 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  4. 2026-11-09 16:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  5. 2026-11-08 16:39 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  6. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  7. 2026-11-06 16:38 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  8. 2026-11-05 16:37 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  9. 2026-11-04 16:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  10. 2026-11-03 16:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  11. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  12. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  13. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  14. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  15. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  17. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  18. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  19. 2026-10-26 11:31 UTCEchelonGraph re-scored
  20. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  21. 2026-10-25 14:24 UTCEchelonGraph re-scored
  22. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  23. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  24. 2026-10-22 23:14 UTCEchelonGraph re-scored
  25. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
Show 75 more
  1. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  2. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  3. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  4. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  5. 2026-10-18 03:36 UTCEchelonGraph re-scored
  6. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  7. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  8. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  9. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  10. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  11. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  12. 2026-10-12 16:02 UTCEchelonGraph re-scored
  13. 2026-10-11 19:44 UTCEchelonGraph re-scored
  14. 2026-10-11 16:59 UTCEchelonGraph re-scored
  15. 2026-10-11 14:24 UTCEchelonGraph re-scored
  16. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  17. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  18. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  19. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  20. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  21. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  22. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  23. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  24. 2026-10-03 16:49 UTCOSV refresh
  25. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  26. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  27. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  28. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  29. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  30. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  31. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.2% · 6th percentile
  32. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  33. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  34. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  35. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  36. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  37. 2026-09-14 07:34 UTCEchelonGraph re-scored
  38. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  39. 2026-09-13 03:09 UTCOSV refresh
  40. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  41. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  42. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  43. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  44. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  45. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  46. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  47. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  48. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  49. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  50. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  51. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  52. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  53. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  54. 2026-08-25 05:10 UTCEchelonGraph re-scored
  55. 2026-08-23 14:53 UTCEchelonGraph re-scored
  56. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  57. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  58. 2026-08-21 20:29 UTCEchelonGraph re-scored
  59. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  60. 2026-08-20 11:13 UTCEchelonGraph re-scored
  61. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  62. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  63. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  64. 2026-08-17 09:11 UTCEchelonGraph re-scored
  65. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  66. 2026-08-16 02:46 UTCEchelonGraph re-scored
  67. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  68. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  69. 2026-08-14 01:23 UTCEchelonGraph re-scored
  70. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  71. 2026-08-12 21:28 UTCEchelonGraph re-scored
  72. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  73. 2026-08-11 22:52 UTCEchelonGraph re-scored
  74. 2026-08-11 00:10 UTCEchelonGraph re-scored
  75. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile

Frequently asked(5)

What is CVE-2026-47274?
CVE-2026-47274 is a medium-severity vulnerability; its CVE record was published on May 27, 2026. pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.9.0, multiple pam_usb helper tools resolved external binaries through the PATH environment variable rather than using absolute paths. An attacker who can influence the process environment during PAM…
When was the CVE record for CVE-2026-47274 published?
The CVE record for CVE-2026-47274 was published on May 27, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 26, 2026; the record at its source may have been updated since.
Is CVE-2026-47274 actively exploited?
CVE-2026-47274 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (3rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-47274?
CVE-2026-47274 has a CVSS base score of 6.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-47274?
A fix for CVE-2026-47274 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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