CVE-2026-18784

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM 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(medium)
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
2%
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 15× in last 7d / 72× 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 127 total refreshes for this CVE.

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

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 97.5% 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

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