CVE-2026-55241

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6% (48th 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
Elevated
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (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: 0.6%CVSS: 7.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Checkmate is an open-source, self-hosted tool designed to track and monitor server hardware, uptime, response times, and incidents in real-time with beautiful visualizations. Prior to 3.9.1, the public POST /api/v1/auth/register route in server/src/api/routes/authRoutes.ts passes multipart profileImage uploads through in-memory Multer parsing before registration validation, without file-size, file-count, or MIME-type limits in server/src/api/middleware/upload.ts. An unauthenticated attacker can submit concurrent oversized files that are buffered before invalid registration or invite-token checks reject the request, exhausting memory and crashing or destabilizing the backend. This issue is fixed in version 3.9.1.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
48th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

August 21, 2026

Last Modified

September 18, 2026

Advisory Details (3)

Auto-updated Aug 21, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

Pre-auth Denial of Service via File Upload on Registration · Advisory · bluewave-labs/Checkmate · GitHub

https://github.com/bluewave-labs/Checkmate/security/advisories/GHSA-9xvg-x28f-m78m
GitHub release Patch Available

v3.9.1

Patch available: bluewave-labs/Checkmate v3.9.1

https://github.com/bluewave-labs/Checkmate/releases/tag/v3.9.1
GitHub commit

commit 091c36cbf338 (bluewave-labs/Checkmate)

Fix landed in bluewave-labs/Checkmate commit 091c36cbf338 — awaiting tagged release

https://github.com/bluewave-labs/Checkmate/commit/091c36cbf338b673110b0806d76df26d52516468

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 54× 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.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  3. 2026-10-12 15:55 UTCEG score recompute
  4. 2026-10-11 19:39 UTCEG score recompute
  5. 2026-10-11 16:54 UTCEG score recompute
  6. 2026-10-11 14:17 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  10. 2026-10-09 05:50 UTCEG score recompute
  11. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  12. 2026-10-08 04:55 UTCEG score recompute
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  14. 2026-10-06 16:49 UTCEG score recompute
  15. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  16. 2026-10-06 03:04 UTCEG score recompute
  17. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  18. 2026-10-05 09:25 UTCEG score recompute
  19. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  20. 2026-10-03 16:42 UTCEG score recompute
  21. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  22. 2026-10-02 21:48 UTCEG score recompute
  23. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  24. 2026-10-01 21:24 UTCEG score recompute
  25. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 47th percentile
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  1. 2026-09-30 20:28 UTCEG score recompute
  2. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  3. 2026-09-29 16:11 UTCEG score recompute
  4. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  5. 2026-09-29 03:44 UTCEG score recompute
  6. 2026-09-28 15:16 UTCEG score recompute
  7. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  8. 2026-09-27 14:40 UTCEG score recompute
  9. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  10. 2026-09-27 02:28 UTCEG score recompute
  11. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  12. 2026-09-25 00:34 UTCEG score recompute
  13. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  14. 2026-09-23 22:25 UTCEG score recompute
  15. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  16. 2026-09-22 22:01 UTCEG score recompute
  17. 2026-09-21 21:36 UTCEG score recompute
  18. 2026-09-20 21:10 UTCEG score recompute
  19. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  20. 2026-09-19 20:42 UTCEG score recompute
  21. 2026-09-18 20:17 UTCEG score recompute
  22. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  23. 2026-09-17 21:16 UTCEG score recompute
  24. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  25. 2026-09-16 19:41 UTCEG score recompute
  26. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  27. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  28. 2026-09-15 04:35 UTCEG score recompute
  29. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  30. 2026-09-14 04:11 UTCEG score recompute
  31. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  32. 2026-09-12 15:35 UTCEG score recompute
  33. 2026-09-11 15:10 UTCEG score recompute
  34. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  35. 2026-09-10 14:42 UTCEG score recompute
  36. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  37. 2026-09-09 01:46 UTCEG score recompute
  38. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  39. 2026-09-07 18:38 UTCEG score recompute
  40. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  41. 2026-09-06 18:03 UTCEG score recompute
  42. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  43. 2026-09-05 17:38 UTCEG score recompute
  44. 2026-09-04 17:09 UTCEG score recompute
  45. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  46. 2026-09-02 16:02 UTCEG score recompute
  47. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  48. 2026-09-01 15:24 UTCEG score recompute
  49. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  50. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  51. 2026-08-31 02:39 UTCEG score recompute
  52. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  53. 2026-08-30 02:14 UTCEG score recompute
  54. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  55. 2026-08-29 01:47 UTCEG score recompute
  56. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  57. 2026-08-28 01:21 UTCEG score recompute
  58. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  59. 2026-08-27 00:55 UTCEG score recompute
  60. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  61. 2026-08-26 00:31 UTCEG score recompute
  62. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  63. 2026-08-25 12:18 UTCEG score recompute
  64. 2026-08-25 12:01 UTCEG score recompute
  65. 2026-08-24 19:32 UTCEG score recompute
  66. 2026-08-23 06:53 UTCEG score recompute
  67. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  68. 2026-08-21 18:18 UTCEG score recompute
  69. 2026-08-21 18:04 UTCEG score recomputeFirst assessed: 7.5 HIGH
  70. 2026-08-21 18:04 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-55241?
CVE-2026-55241 is a high-severity vulnerability; its CVE record was published on August 21, 2026. Checkmate is an open-source, self-hosted tool designed to track and monitor server hardware, uptime, response times, and incidents in real-time with beautiful visualizations. Prior to 3.9.1, the public POST /api/v1/auth/register route in server/src/api/routes/authRoutes.ts passes multipart…
When was the CVE record for CVE-2026-55241 published?
The CVE record for CVE-2026-55241 was published on August 21, 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 September 18, 2026; the record at its source may have been updated since.
Is CVE-2026-55241 actively exploited?
CVE-2026-55241 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (48th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55241?
CVE-2026-55241 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55241?
A fix for CVE-2026-55241 is available: update to the fixed version the vendor names in its advisory.

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