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.
CVE-2026-19670
MEDIUMPre-NVD 5.45.4—Trending — 4 sources updated this weekElevated
EchelonGraph scoreHIGH 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
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: Elevated riskExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 5.4
- EG Score
- 5.4(high)
- EG Risk
- 40(Track)EG Risk 40/100SSVC: Track
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 computedSeverity54% × 45%Exploitation40% × 40%Automatability0% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 7%
- KEV
- Not listed
Published
August 18, 2026
Last Modified
August 18, 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-mhr6cisa 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-26-230-01Vendor 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 10× in last 7d / 10× 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.
- 2026-08-21 01:11 UTCEG score recompute
- 2026-08-21 01:11 UTCGHSA enrichment
- 2026-08-20 22:55 UTCEPSS rescore
- 2026-08-19 22:47 UTCEG score recompute
- 2026-08-19 22:47 UTCGHSA enrichment
- 2026-08-19 17:03 UTCEPSS rescore
- 2026-08-18 20:22 UTCEG score recompute
- 2026-08-18 19:53 UTCEG score recompute
- 2026-08-18 19:19 UTCEG score recompute
- 2026-08-18 19:18 UTCMITRE cvelistV5first tracked
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 in the National Vulnerability Database on August 18, 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% probability of exploitation in the next 30 days, which ranks it in the top 92.8% of all scored CVEs.
What is the CVSS score of CVE-2026-19670?
CVE-2026-19670 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-19670?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-19670, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-19670
Is Your Infrastructure Affected by CVE-2026-19670?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.