CVE-2026-11946

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-02. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

An unauthenticated remote attacker can exhaust server memory via the GetEndpoints Discovery Service in open62541. The endpointUrl field of GetEndpointsRequest is not validated for length. An attacker can declare an arbitrarily large string (up to ~4.09 GB via the UInt32 length field) delivered across intermediate chunks without ever sending the final chunk. The server buffers all chunks in RAM indefinitely until the SecureChannel times out. The attack is pre-session and bypasses all encryption configurations.

The issue affects open62541: from 1.4.0 through 1.4.16, from 1.5.0 through 1.5.4, master.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
38
EG Risk 38/100

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
Severity75% × 45%
Exploitation1% × 40%
Automatability30% × 15%
EPSS PROB
0.5%
EPSS %ILE
42nd
KEV
Not listed

Published

July 2, 2026

Last Modified

July 2, 2026

Advisory Details (3)

Auto-updated Jul 3, 2026
Patch available. Sources: github_pr.
github_pr Patch Available

fix(server): Enforce default message and chunk size limits to prevent DoS

Patch available: open62541/open62541 v1.4.17 (PR #8142 merged 2026-06-23)

https://github.com/open62541/open62541/pull/8142/changes/d253818d6c5e870e1db0e360b18138c8bdc809ae
github_pr Patch Available

fix(server): Enforce default message and chunk size limits to prevent DoS

Patch available: open62541/open62541 v1.4.17 (PR #8142 merged 2026-06-23)

https://github.com/open62541/open62541/pull/8142
generic

GitHub - open62541/open62541: Open source implementation of OPC UA (OPC Unified Architecture) aka IEC 62541 licensed under Mozilla Public License v2.0 · GitHub

https://github.com/open62541/open62541

Vendor Advisories for CVE-2026-11946(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 7× in last 7d / 30× 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 227 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-11946?
CVE-2026-11946 is a high vulnerability published on July 2, 2026. An unauthenticated remote attacker can exhaust server memory via the GetEndpoints Discovery Service in open62541. The endpointUrl field of GetEndpointsRequest is not validated for length. An attacker can declare an arbitrarily large string (up to ~4.09 GB via the UInt32 length field) delivered…
When was CVE-2026-11946 disclosed?
CVE-2026-11946 was first published on July 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-11946 actively exploited?
CVE-2026-11946 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (42nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-11946?
CVE-2026-11946 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-11946?
A fix for CVE-2026-11946 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-11946 are linked in the Vendor Advisories panel on this page.

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