CVE-2026-54155

HIGHPre-NVD 7.77.7—
EchelonGraph scoreHIGH 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%CVSS: 7.7Exploit: None knownExposed: 0

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

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
7.7(high)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity77% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

August 20, 2026

Last Modified

September 14, 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 / EcosystemFixed in / 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 rangeFixed inDependents
node-opcua———

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 26× in last 7d / 76× 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. 2026-09-18 21:54 UTCEG score recompute
  2. 2026-09-18 21:54 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 11:01 UTCGHSA enrichment
  5. 2026-09-18 00:08 UTCEG score recompute
  6. 2026-09-18 00:08 UTCGHSA enrichment
  7. 2026-09-17 19:31 UTCEPSS rescore
  8. 2026-09-17 12:15 UTCGHSA enrichment
  9. 2026-09-17 01:22 UTCGHSA enrichment
  10. 2026-09-16 14:29 UTCEG score recompute
  11. 2026-09-16 14:29 UTCGHSA enrichment
  12. 2026-09-16 14:08 UTCEPSS rescore
  13. 2026-09-16 05:15 UTCEPSS rescore
  14. 2026-09-16 03:32 UTCGHSA enrichment
  15. 2026-09-15 16:39 UTCGHSA enrichment
  16. 2026-09-15 05:46 UTCGHSA enrichment
  17. 2026-09-14 17:55 UTCEG score recompute
  18. 2026-09-14 17:55 UTCGHSA enrichment
  19. 2026-09-14 16:45 UTCEG score recompute
  20. 2026-09-14 16:45 UTCGHSA enrichment
  21. 2026-09-14 16:20 UTCGHSA enrichment
  22. 2026-09-14 14:22 UTCGHSA enrichment
  23. 2026-09-14 03:29 UTCGHSA enrichment
  24. 2026-09-13 16:36 UTCGHSA enrichment
  25. 2026-09-13 05:43 UTCGHSA enrichment
Show 51 more
  1. 2026-09-12 18:50 UTCGHSA enrichment
  2. 2026-09-12 07:57 UTCGHSA enrichment
  3. 2026-09-11 21:04 UTCGHSA enrichment
  4. 2026-09-11 10:11 UTCGHSA enrichment
  5. 2026-09-10 23:15 UTCGHSA enrichment
  6. 2026-09-10 12:14 UTCGHSA enrichment
  7. 2026-09-10 00:49 UTCGHSA enrichment
  8. 2026-09-09 13:04 UTCGHSA enrichment
  9. 2026-09-09 01:55 UTCGHSA enrichment
  10. 2026-09-08 04:12 UTCGHSA enrichment
  11. 2026-09-07 17:19 UTCGHSA enrichment
  12. 2026-09-07 06:26 UTCGHSA enrichment
  13. 2026-09-06 19:25 UTCGHSA enrichment
  14. 2026-09-06 08:31 UTCGHSA enrichment
  15. 2026-09-05 21:38 UTCGHSA enrichment
  16. 2026-09-05 10:46 UTCGHSA enrichment
  17. 2026-09-04 23:51 UTCGHSA enrichment
  18. 2026-09-04 11:46 UTCGHSA enrichment
  19. 2026-09-04 00:53 UTCGHSA enrichment
  20. 2026-09-03 13:51 UTCGHSA enrichment
  21. 2026-09-03 02:58 UTCGHSA enrichment
  22. 2026-09-02 16:05 UTCGHSA enrichment
  23. 2026-09-02 04:36 UTCGHSA enrichment
  24. 2026-09-01 17:29 UTCGHSA enrichment
  25. 2026-09-01 06:34 UTCGHSA enrichment
  26. 2026-08-31 19:38 UTCGHSA enrichment
  27. 2026-08-31 08:45 UTCGHSA enrichment
  28. 2026-08-30 21:19 UTCGHSA enrichment
  29. 2026-08-30 10:27 UTCGHSA enrichment
  30. 2026-08-29 23:34 UTCGHSA enrichment
  31. 2026-08-29 12:42 UTCGHSA enrichment
  32. 2026-08-29 01:28 UTCGHSA enrichment
  33. 2026-08-28 11:45 UTCGHSA enrichment
  34. 2026-08-28 00:52 UTCGHSA enrichment
  35. 2026-08-27 13:59 UTCGHSA enrichment
  36. 2026-08-27 03:06 UTCGHSA enrichment
  37. 2026-08-26 16:14 UTCGHSA enrichment
  38. 2026-08-26 05:17 UTCGHSA enrichment
  39. 2026-08-25 18:23 UTCGHSA enrichment
  40. 2026-08-25 07:30 UTCGHSA enrichment
  41. 2026-08-24 20:37 UTCGHSA enrichment
  42. 2026-08-24 09:45 UTCGHSA enrichment
  43. 2026-08-23 22:52 UTCGHSA enrichment
  44. 2026-08-23 12:00 UTCGHSA enrichment
  45. 2026-08-23 01:07 UTCGHSA enrichment
  46. 2026-08-22 14:15 UTCGHSA enrichment
  47. 2026-08-22 03:21 UTCGHSA enrichment
  48. 2026-08-21 16:28 UTCGHSA enrichment
  49. 2026-08-21 05:35 UTCGHSA enrichment
  50. 2026-08-20 18:42 UTCEG score recompute
  51. 2026-08-20 18:42 UTCGHSA enrichment

Related CVEs(same CWE)

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 in the National Vulnerability Database on August 20, 2026, with the most recent update on September 14, 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% probability of exploitation in the next 30 days, which ranks it in the top 74.0% of all scored CVEs.
What is the CVSS score of CVE-2026-54155?
CVE-2026-54155 has a CVSS v3 base score of 7.7 (NVD).
How do I remediate CVE-2026-54155?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54155, 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-2026-54155

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