CVE-2026-82623

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-08-31. 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: 1%CVSS: 5.3Exploit: Elevated riskExposed: 0

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

A vulnerability was detected in open62541 up to 1.5.5. Affected by this vulnerability is the function UA_DataValue_backend_copyRange of the file plugins/historydata/ua_history_data_backend_memory.c of the component History Backend. The manipulation results in use after free. The attack can be launched remotely. The exploit is now public and may 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
5.3(high)
EG Risk
55(Attend)
EG Risk 55/100SSVC: Attend

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%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
1%
EPSS %ILE
51%
KEV
Not listed

Published

August 31, 2026

Last Modified

August 31, 2026

Advisory Details (2)

Auto-updated Aug 31, 2026
No patch confirmed yet.
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/
generic

Server-Side Heap Use-After-Free in HistoryRead `indexRange` Handling · Issue #8199 · open62541/open62541 · GitHub

https://github.com/open62541/open62541/issues/8199

Vendor Advisories for CVE-2026-82623(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 rangeFixed inDependents
open625411.4.11.1-1, 1.4.18-1——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
open625411.4.11.1-1, 1.4.18-1——

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 75× 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. 2026-09-24 14:04 UTCEPSS rescore
  2. 2026-09-24 12:20 UTCEG score recompute
  3. 2026-09-24 12:20 UTCGHSA enrichment
  4. 2026-09-23 17:54 UTCEPSS rescore
  5. 2026-09-23 11:40 UTCEG score recompute
  6. 2026-09-23 11:40 UTCGHSA enrichment
  7. 2026-09-22 16:01 UTCEPSS rescore
  8. 2026-09-22 11:00 UTCEG score recompute
  9. 2026-09-22 11:00 UTCGHSA enrichment
  10. 2026-09-21 21:09 UTCEPSS rescore
  11. 2026-09-21 10:21 UTCEG score recompute
  12. 2026-09-21 10:21 UTCGHSA enrichment
  13. 2026-09-20 20:16 UTCEPSS rescore
  14. 2026-09-20 09:42 UTCEG score recompute
  15. 2026-09-20 09:42 UTCGHSA enrichment
  16. 2026-09-19 09:03 UTCEG score recompute
  17. 2026-09-19 09:03 UTCGHSA enrichment
  18. 2026-09-18 19:28 UTCEPSS rescore
  19. 2026-09-18 08:23 UTCEG score recompute
  20. 2026-09-18 08:23 UTCGHSA enrichment
  21. 2026-09-17 07:41 UTCEG score recompute
  22. 2026-09-17 07:41 UTCGHSA enrichment
  23. 2026-09-16 14:08 UTCEPSS rescore
  24. 2026-09-16 07:00 UTCEG score recompute
  25. 2026-09-16 07:00 UTCGHSA enrichment
Show 50 more
  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-15 06:21 UTCEG score recompute
  3. 2026-09-15 06:21 UTCGHSA enrichment
  4. 2026-09-15 03:12 UTCEPSS rescore
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-14 05:42 UTCEG score recompute
  7. 2026-09-14 05:42 UTCGHSA enrichment
  8. 2026-09-13 05:03 UTCEG score recompute
  9. 2026-09-13 05:03 UTCGHSA enrichment
  10. 2026-09-12 04:24 UTCEG score recompute
  11. 2026-09-12 04:24 UTCGHSA enrichment
  12. 2026-09-11 14:53 UTCEPSS rescore
  13. 2026-09-11 14:53 UTCEPSS rescore
  14. 2026-09-11 03:45 UTCEG score recompute
  15. 2026-09-11 03:45 UTCGHSA enrichment
  16. 2026-09-10 03:06 UTCGHSA enrichment
  17. 2026-09-09 02:26 UTCEG score recompute
  18. 2026-09-09 02:25 UTCGHSA enrichment
  19. 2026-09-08 22:01 UTCEPSS rescore
  20. 2026-09-08 01:39 UTCEG score recompute
  21. 2026-09-08 01:39 UTCGHSA enrichment
  22. 2026-09-07 01:01 UTCEG score recompute
  23. 2026-09-07 01:01 UTCGHSA enrichment
  24. 2026-09-06 13:48 UTCEPSS rescore
  25. 2026-09-06 00:22 UTCEG score recompute
  26. 2026-09-06 00:22 UTCGHSA enrichment
  27. 2026-09-05 15:31 UTCEPSS rescore
  28. 2026-09-04 23:41 UTCEG score recompute
  29. 2026-09-04 23:41 UTCGHSA enrichment
  30. 2026-09-04 05:07 UTCEPSS rescore
  31. 2026-09-03 23:02 UTCGHSA enrichment
  32. 2026-09-02 22:22 UTCEG score recompute
  33. 2026-09-02 22:21 UTCGHSA enrichment
  34. 2026-09-02 14:12 UTCEPSS rescore
  35. 2026-09-01 21:41 UTCEG score recompute
  36. 2026-09-01 21:41 UTCGHSA enrichment
  37. 2026-09-01 13:54 UTCEPSS rescore
  38. 2026-09-01 04:40 UTCEPSS rescore
  39. 2026-09-01 04:40 UTCEPSS rescore
  40. 2026-08-31 21:02 UTCGHSA enrichment
  41. 2026-08-31 17:24 UTCEG score recompute
  42. 2026-08-31 17:24 UTCGHSA enrichment
  43. 2026-08-31 17:20 UTCNVD updateCVSS v4 → 5.5
  44. 2026-08-31 16:32 UTCEG score recompute
  45. 2026-08-31 16:31 UTCGHSA enrichment
  46. 2026-08-31 16:29 UTCMITRE cvelistV5CVSS v4 → 6.9
  47. 2026-08-31 07:28 UTCEG score recompute
  48. 2026-08-31 07:27 UTCNVD updateCVSS v4 → 5.5
  49. 2026-08-31 06:43 UTCEG score recompute
  50. 2026-08-31 06:43 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-82623?
CVE-2026-82623 is a medium vulnerability published on August 31, 2026. A vulnerability was detected in open62541 up to 1.5.5. Affected by this vulnerability is the function UADataValuebackendcopyRange of the file plugins/historydata/uahistorydatabackend_memory.c of the component History Backend. The manipulation results in use after free. The attack can be launched…
When was CVE-2026-82623 disclosed?
CVE-2026-82623 was first published in the National Vulnerability Database on August 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82623 actively exploited?
CVE-2026-82623 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 48.9% of all scored CVEs.
What is the CVSS score of CVE-2026-82623?
CVE-2026-82623 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-82623?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82623, 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-2026-82623

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