CVE-2026-54155

HIGHPre-NVD 7.77.7—
EchelonGraph scoreMEDIUM confidence

Score 7.7 from GitHub Security Advisory (severity: HIGH) published 2026-08-20. A secondary CVSS source baseline 7.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.7Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

node-opcua is an OPC UA implementation for TypeScript and Node.js. Prior to 2.166.0, the UserNameIdentityToken authentication handler in packages/node-opcua-server/source/opcua_server.ts decrypts an RSA-OAEP password blob but does not verify that the trailing bytes match the current session serverNonce. An unauthenticated remote attacker can obtain the server public key through GetEndpoints and forge a blob whose little-endian length produces an empty password passed to isValidUser, compromising accounts that accept an empty password. Missing nonce binding also allows a captured UserNameIdentityToken ciphertext to be replayed in another session, and SecurityMode=None removes the separate client-signature safeguard. This issue is fixed in version 2.166.0.

CVSS v3
7.7
EG Score
7.7HIGHmedium confidence
EG Risk
35
EG Risk 35/100CISA 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
Severity77% × 45%
Exploitation0% × 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
0.4%
EPSS %ILE
34th
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 none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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 20, 2026

Last Modified

September 30, 2026

Advisory Details (2)

Auto-updated Sep 14, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
github_commit

commit c6b05738682f (node-opcua/node-opcua)

Fix landed in node-opcua/node-opcua commit c6b05738682f — awaiting tagged release

https://github.com/node-opcua/node-opcua/commit/c6b05738682f5c8d70b1ea275c881f01a1cd9787
github Patch Available🟡 PoC Available

[Security] Missing nonce verification in UserNameIdentityToken authentication (CVSS 8.1) · Advisory · node-opcua/node-opcua · GitHub

https://github.com/node-opcua/node-opcua/security/advisories/GHSA-mq36-523m-x7vv

Vendor Advisories for CVE-2026-54155(1)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
npmnode-opcua—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
node-opcua—
  • every version through 2.165.0: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 27× in last 7d / 97× 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 133 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-54155?
CVE-2026-54155 is a high vulnerability published on August 20, 2026. node-opcua is an OPC UA implementation for TypeScript and Node.js. Prior to 2.166.0, the UserNameIdentityToken authentication handler in packages/node-opcua-server/source/opcua_server.ts decrypts an RSA-OAEP password blob but does not verify that the trailing bytes match the current session…
When was CVE-2026-54155 disclosed?
CVE-2026-54155 was first published on August 20, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54155 actively exploited?
CVE-2026-54155 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (34th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54155?
CVE-2026-54155 has a CVSS base score of 7.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54155?
A fix for CVE-2026-54155 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-54155 are linked in the Vendor Advisories panel on this page.

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