CVE-2026-40254

MEDIUMNVD 4.24.2
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 4.2 under NVD CVSS v3. EPSS exploit probability: 0.2% (9th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Elevated

Also known asEUVD-2026-25381 (ENISA EUVD)Source: ENISA EUVD

4.2EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 4.2Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

FreeRDP is a free implementation of the Remote Desktop Protocol. Versions prior to 3.25.0 have an off-by-one in the path traversal filter in channels/drive/client/drive_file.c. The contains_dotdot() function catches ../ and ..\ mid-path but misses .. when it's the last component with no trailing separator. A rogue RDP server can read, list, or write files one directory above the client's shared folder through RDPDR requests. This requires the victim to connect with drive redirection enabled. Version 3.25.0 patches the issue.

CVSS v3
4.2
EG Score
4.2MEDIUMmedium confidence
EG Risk
35
EG Risk 35/100

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)
Severity42% × 45%
Impact severity (EG Severity): CVSS 4.2 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
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 public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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
0.2%
EPSS %ILE
9th
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 (4.2): severity, escalated by confirmed exploitation. This CVE's 4.2 is its impact severity (EG Severity), not escalated.

EG Severity
4.2 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS. 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: 60 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).

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

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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)60 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 partial (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

April 24, 2026

Last Modified

April 27, 2026

Advisory Details (1)

Auto-updated Aug 2, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

contains_dotdot() off-by-one allows drive channel path traversal via terminal .. · Advisory · FreeRDP/FreeRDP · GitHub

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-3xpj-m4hx-8vmx

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp22.10.0+dfsg1-1 ... 2.9.0+dfsg1-1~bpo11+1 (32 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp22.10.0+dfsg1-1 ... 2.11.7+dfsg1-6~deb12u1 (13 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp33.15.0+dfsg-2.1, 3.15.0+dfsg-2.1+deb13u1, 3.15.0+dfsg-2.1+deb13u2
  • every version up to 3.15.0+dfsg-2.1+deb13u3: fixed in 3.15.0+dfsg-2.1+deb13u3
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
freerdp33.15.0+dfsg-2.1 ... 3.24.2+dfsg-1~bpo13+1 (26 versions)
  • every version up to 3.25.0+dfsg-1: fixed in 3.25.0+dfsg-1
—

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 7× in last 7d / 36× 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 99 of 207 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. 1 repeat row among the latest 100 is merged into the row it repeats. The 108 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

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

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Frequently asked(5)

What is CVE-2026-40254?
CVE-2026-40254 is a medium-severity vulnerability; its CVE record was published on April 24, 2026. FreeRDP is a free implementation of the Remote Desktop Protocol. Versions prior to 3.25.0 have an off-by-one in the path traversal filter in channels/drive/client/drivefile.c. The containsdotdot() function catches ../ and ..\ mid-path but misses .. when it's the last component with no trailing…
When was the CVE record for CVE-2026-40254 published?
The CVE record for CVE-2026-40254 was published on April 24, 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 April 27, 2026; the record at its source may have been updated since.
Is CVE-2026-40254 actively exploited?
CVE-2026-40254 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (9th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-40254?
CVE-2026-40254 has a CVSS v3 base score of 4.2 (NVD).
How do I remediate CVE-2026-40254?
A fix for CVE-2026-40254 is available: update to the fixed version the vendor names in its advisory.

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