CVE-2026-19670

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreMEDIUM confidence

Score 5.4 from GitHub Security Advisory published 2026-08-18. A secondary CVSS source baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.4Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Malcolm's nginx Lua role-based access control (RBAC) layer decides whether an authenticated user may reach a role-restricted path (e.g. /htadmin, /auth, /admin_login, /arkime/api/esadmin, NetBox, upload endpoints) by pattern-matching the raw, percent-encoded request URI. Nginx itself, however, selects which location block actually serves the request using the percent-decoded, normalized URI. Because the RBAC check never percent-decodes its input, an authenticated low-privilege user can request an admin-only path using percent-encoding (e.g. /%68tadmin.php) and have nginx route it to the restricted location while the Lua RBAC gate evaluating the un-decoded raw string finds no matching restriction and grants access.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
40
EG Risk 40/100CISA SSVC

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
Severity54% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.2%
EPSS %ILE
11th
KEV
Not listed

CISA SSVCTrack 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). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 18, 2026

Last Modified

September 8, 2026

Advisory Details (2)

Auto-updated Aug 18, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa, github.
github Patch Available🟡 PoC Available

Raw-stream and Lzip Uploads Bypass Malcolm's Archive-Bomb Protections · Advisory · cisagov/Malcolm · GitHub

https://github.com/cisagov/Malcolm/security/advisories/GHSA-f2v6-8cj4-mhr6
cisa Patch Available🔴 Active Exploitation

CISA Malcolm | CISA

CISA Malcolm | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/news-events/ics-advisories/icsa-26-230-01

Vendor Advisories for CVE-2026-19670(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 14× in last 7d / 68× 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 114 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-19670?
CVE-2026-19670 is a medium vulnerability published on August 18, 2026. Malcolm's nginx Lua role-based access control (RBAC) layer decides whether an authenticated user may reach a role-restricted path (e.g. /htadmin, /auth, /admin_login, /arkime/api/esadmin, NetBox, upload endpoints) by pattern-matching the raw, percent-encoded request URI. Nginx itself, however,…
When was CVE-2026-19670 disclosed?
CVE-2026-19670 was first published on August 18, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-19670 actively exploited?
CVE-2026-19670 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (11th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-19670?
CVE-2026-19670 has a CVSS base score of 5.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-19670?
A fix for CVE-2026-19670 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-19670 are linked in the Vendor Advisories panel on this page.

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