CVE-2026-33592

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 FindServers Discovery Service in open62541. The serverUris field of FindServersRequest is not validated for length or array size. An attacker can declare an arbitrarily large string (up to ~3.9 GB) 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 configuration. 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 2, 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-2026-33592(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 / 34× 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 240 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-33592?
CVE-2026-33592 is a high vulnerability published on July 2, 2026. An unauthenticated remote attacker can exhaust server memory via the FindServers Discovery Service in open62541. The serverUris field of FindServersRequest is not validated for length or array size. An attacker can declare an arbitrarily large string (up to ~3.9 GB) delivered across intermediate…
When was CVE-2026-33592 disclosed?
CVE-2026-33592 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-2026-33592 actively exploited?
CVE-2026-33592 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-2026-33592?
CVE-2026-33592 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-2026-33592?
A fix for CVE-2026-33592 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-33592 are linked in the Vendor Advisories panel on this page.

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