CVE-2026-18784

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory (severity: LOW) published 2026-08-04. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: Elevated riskExposed: 0

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

A vulnerability was found in o6 open62541 up to 1.5.5. This issue affects the function UA_Client_readNodeClassAttribute of the file src/client/ua_client_highlevel.c. Performing a manipulation results in heap-based buffer overflow. Attacking locally is a requirement. The exploit has been made public and could be used. The project closed the issue report, stating that this is not the official way to report a security vulnerability.

CVSS v3
5.3
EG Score
5.3(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 computed
Severity53% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

August 4, 2026

Last Modified

August 12, 2026

Advisory Details (2)

Auto-updated Aug 4, 2026
No patch confirmed yet.
generic

open62541 client-side `heap-buffer-overflow` in `UA_Client_readNodeClassAttribute()` · Issue #11 · gff-cw/information · GitHub

https://github.com/gff-cw/information/issues/11
generic

open62541 client-side `heap-buffer-overflow` in `UA_Client_readNodeClassAttribute()` · Issue #8139 · open62541/open62541 · GitHub

https://github.com/open62541/open62541/issues/8139

Vendor Advisories for CVE-2026-18784(1)

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

Affected Packages

(2 across 2 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
open625411.4.11.1-1, 1.4.18-1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
open625411.4.11.1-1, 1.4.18-1——

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 21× in last 7d / 53× 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.

  1. 2026-08-20 23:16 UTCEG score recompute
  2. 2026-08-20 23:16 UTCGHSA enrichment
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-19 23:02 UTCEG score recompute
  5. 2026-08-19 23:02 UTCGHSA enrichment
  6. 2026-08-19 17:03 UTCEPSS rescore
  7. 2026-08-18 22:47 UTCEG score recompute
  8. 2026-08-18 22:47 UTCGHSA enrichment
  9. 2026-08-18 13:48 UTCEPSS rescore
  10. 2026-08-17 22:26 UTCEG score recompute
  11. 2026-08-17 22:26 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-16 22:08 UTCEG score recompute
  14. 2026-08-16 22:08 UTCGHSA enrichment
  15. 2026-08-16 14:56 UTCEPSS rescore
  16. 2026-08-16 02:14 UTCEPSS rescore
  17. 2026-08-15 21:54 UTCEG score recompute
  18. 2026-08-15 21:54 UTCGHSA enrichment
  19. 2026-08-15 01:30 UTCEPSS rescore
  20. 2026-08-14 21:39 UTCEG score recompute
  21. 2026-08-14 21:39 UTCGHSA enrichment
  22. 2026-08-13 22:00 UTCEPSS rescore
  23. 2026-08-13 21:24 UTCGHSA enrichment
  24. 2026-08-12 21:08 UTCGHSA enrichment
  25. 2026-08-12 18:29 UTCEG score recompute
Show 28 more
  1. 2026-08-12 18:29 UTCGHSA enrichment
  2. 2026-08-12 13:50 UTCEPSS rescore
  3. 2026-08-11 18:15 UTCEG score recompute
  4. 2026-08-11 18:15 UTCGHSA enrichment
  5. 2026-08-11 13:42 UTCEPSS rescore
  6. 2026-08-11 00:00 UTCEPSS rescore
  7. 2026-08-10 17:58 UTCGHSA enrichment
  8. 2026-08-09 17:31 UTCEG score recompute
  9. 2026-08-09 17:31 UTCGHSA enrichment
  10. 2026-08-09 13:46 UTCEPSS rescore
  11. 2026-08-08 17:17 UTCEG score recompute
  12. 2026-08-08 17:17 UTCGHSA enrichment
  13. 2026-08-08 16:37 UTCEPSS rescore
  14. 2026-08-07 17:02 UTCGHSA enrichment
  15. 2026-08-06 16:47 UTCEG score recompute
  16. 2026-08-06 16:47 UTCGHSA enrichment
  17. 2026-08-06 13:46 UTCEPSS rescore
  18. 2026-08-05 19:17 UTCEPSS rescore
  19. 2026-08-05 16:32 UTCEG score recompute
  20. 2026-08-05 16:32 UTCGHSA enrichment
  21. 2026-08-05 16:27 UTCNVD updateCVSS v4 → 1.9
  22. 2026-08-05 15:29 UTCEG score recompute
  23. 2026-08-05 15:29 UTCGHSA enrichment
  24. 2026-08-05 15:25 UTCMITRE cvelistV5CVSS v4 → 4.8
  25. 2026-08-04 17:23 UTCEG score recompute
  26. 2026-08-04 17:23 UTCNVD updateCVSS v4 → 1.9
  27. 2026-08-04 17:07 UTCEG score recompute
  28. 2026-08-04 17:06 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-18784?
CVE-2026-18784 is a medium vulnerability published on August 4, 2026. A vulnerability was found in o6 open62541 up to 1.5.5. This issue affects the function UAClientreadNodeClassAttribute of the file src/client/uaclienthighlevel.c. Performing a manipulation results in heap-based buffer overflow. Attacking locally is a requirement. The exploit has been made public and…
When was CVE-2026-18784 disclosed?
CVE-2026-18784 was first published in the National Vulnerability Database on August 4, 2026, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-18784 actively exploited?
CVE-2026-18784 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 97.4% of all scored CVEs.
What is the CVSS score of CVE-2026-18784?
CVE-2026-18784 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-18784?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-18784, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-18784

Explore →

Is Your Infrastructure Affected by CVE-2026-18784?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs