CVE-2026-45255

HIGHNVD 7.57.5
EchelonGraph scoreMEDIUM confidence

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

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-05-21. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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

The CVE record's CNA (FreeBSD) lists FreeBSD versions 15.0-RELEASE up to but not including p9, 14.4-RELEASE up to but not including p5 and 14.3-RELEASE up to but not including p14 as affected. No release containing a fix is confirmed on record.

When bsdinstall or bsdconfig are prompted to scan for nearby Wi-Fi networks, they build up a list of network names and use bsddialog(1) to prompt the user to select a network. This is implemented using a shell script, and the code which handled network names was not careful to prevent expansion by the shell. As a result, a suitably crafted network name can be used to execute commands via a subshell.

The problem can be exploited to execute code as root on the system running bsdinstall or bsdconfig. The attacker would need to create an access point with a specially crafted name and be within range of a Wi-Fi scan. Note that bsdinstall and bsdconfig are vulnerable as soon as the user prompts them to scan for nearby networks; they do not need to actually select the malicious network.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
34
EG Risk 34/100

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)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 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: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
26th
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 (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-17). 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: 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).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

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.

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 21, 2026

Last Modified

July 23, 2026

Advisory Details (1)

Auto-updated Jun 6, 2026
No fix on record yet.

Vendor Advisories for CVE-2026-45255(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× 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 it from the CNA feed. 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). Most recent first.

Showing the most recent 100 of 253 refreshes 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 153 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  2. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  3. 2026-10-18 03:38 UTCEG score recompute
  4. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  5. 2026-10-17 13:42 UTCEG score recompute
  6. 2026-10-17 13:42 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  7. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  8. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  9. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  10. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  11. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  12. 2026-10-12 16:04 UTCEG score recompute
  13. 2026-10-11 19:46 UTCEG score recompute
  14. 2026-10-11 17:01 UTCEG score recompute
  15. 2026-10-11 14:26 UTCEG score recompute
  16. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  17. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  18. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  19. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  20. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  21. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  22. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  23. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  24. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  25. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 25th percentile
Show 75 more
  1. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  2. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  3. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  4. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  5. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  6. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  7. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  8. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  9. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  10. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  11. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  12. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  13. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  14. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  15. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  16. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  17. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  18. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  19. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  20. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  21. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  22. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  23. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  24. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  25. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  26. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  27. 2026-08-23 16:50 UTCEG score recompute
  28. 2026-08-23 16:50 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  29. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  30. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  31. 2026-08-21 21:47 UTCEG score recompute
  32. 2026-08-21 21:47 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  33. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  34. 2026-08-20 18:50 UTCEG score recompute
  35. 2026-08-20 18:50 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  36. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  37. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  38. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  39. 2026-08-17 09:49 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  40. 2026-08-16 16:51 UTCEG score recompute
  41. 2026-08-16 16:51 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  42. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  43. 2026-08-16 03:26 UTCEG score recompute
  44. 2026-08-16 03:26 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  45. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  46. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  47. 2026-08-15 00:23 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  48. 2026-08-14 13:11 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  49. 2026-08-14 01:58 UTCEG score recompute
  50. 2026-08-14 01:58 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  51. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  52. 2026-08-13 01:27 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  53. 2026-08-12 14:14 UTCEG score recompute
  54. 2026-08-12 14:14 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  55. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  56. 2026-08-12 01:06 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  57. 2026-08-11 13:50 UTCEG score recompute
  58. 2026-08-11 13:50 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  59. 2026-08-11 00:32 UTCEG score recompute
  60. 2026-08-11 00:32 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  61. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  62. 2026-08-10 11:12 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  63. 2026-08-09 23:54 UTCEG score recompute
  64. 2026-08-09 23:54 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  65. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  66. 2026-08-09 12:42 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  67. 2026-08-09 01:29 UTCEG score recompute
  68. 2026-08-09 01:29 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  69. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  70. 2026-08-08 05:19 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  71. 2026-08-07 18:06 UTCEG score recompute
  72. 2026-08-07 18:06 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  73. 2026-08-07 06:53 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5
  74. 2026-08-06 19:39 UTCEG score recompute
  75. 2026-08-06 19:39 UTCGHSA enrichmentGHSA-qj4f-cpgw-vqx9 · GitHub severity HIGH · GitHub CVSS 7.5

Frequently asked(5)

What is CVE-2026-45255?
CVE-2026-45255 is a high-severity vulnerability; its CVE record was published on May 21, 2026. When bsdinstall or bsdconfig are prompted to scan for nearby Wi-Fi networks, they build up a list of network names and use bsddialog(1) to prompt the user to select a network. This is implemented using a shell script, and the code which handled network names was not careful to prevent expansion by…
When was CVE-2026-45255 made public?
CVE-2026-45255 was made public on May 20, 2026: that is the date its CVE record's CNA, FreeBSD, gives for when the vulnerability was made public. The CVE record itself was published on May 21, 2026. EchelonGraph's copy of the record carries a last-modified date of July 23, 2026; the record at its source may have been updated since.
Is CVE-2026-45255 actively exploited?
CVE-2026-45255 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (26th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-45255?
CVE-2026-45255 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-45255?
No fix for CVE-2026-45255 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's CNA (FreeBSD) lists FreeBSD versions 15.0-RELEASE up to but not including p9, 14.4-RELEASE up to but not including p5 and 14.3-RELEASE up to but not including p14 as affected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-45255 are linked in the Vendor Advisories panel on this page.

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