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: 0.2%CVSS: 5.3Exploit: Elevated riskExposed services: Not assessed

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

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
5.3MEDIUMmedium 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
Severity53% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
5th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

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 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 rangeFix by version rangeDependents
open625411.4.11.1-1, 1.4.18-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
open625411.4.11.1-1, 1.4.18-1
  • every version on: no fix on record
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 61× 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 152 total refreshes for this CVE.

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

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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 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 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-18784?
CVE-2026-18784 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-18784?
No fix for CVE-2026-18784 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-18784 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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