CVE-2026-67863

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-06. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
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%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

In open62541 1.5.5, a server-side use-after-free exists in the local MonitoredItem callback path. The issue occurs when UA_Subscription_localPublish continues to use the current UA_Notification after a callback invokes UA_Server_deleteMonitoredItem for the current local MonitoredItem. This allows a remote attacker to cause a denial of service.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
50(Track)
EG Risk 50/100SSVC: 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
Severity75% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

August 5, 2026

Last Modified

August 7, 2026

Advisory Details (4)

Auto-updated Aug 5, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

open62541/src/server/ua_services_monitoreditem.c at v1.5.5 · open62541/open62541 · GitHub

https://github.com/open62541/open62541/blob/v1.5.5/src/server/ua_services_monitoreditem.c
generic

open62541/src/server/ua_subscription.c at v1.5.5 · open62541/open62541 · GitHub

https://github.com/open62541/open62541/blob/v1.5.5/src/server/ua_subscription.c
generic🔴 Active Exploitation

open62541/include/open62541/server.h at v1.5.5 · open62541/open62541 · GitHub

https://github.com/open62541/open62541/blob/v1.5.5/include/open62541/server.h
generic

Server-side `heap-use-after-free` in `UA_Subscription_localPublish()` when a local MonitoredItem deletes itself from its callback · Issue #8131 · open62541/open62541 · GitHub

https://github.com/open62541/open62541/issues/8131

Vendor Advisories for CVE-2026-67863(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(1)

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

Data Freshness Timeline

(refreshed 30× in last 7d / 72× 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. 2026-08-21 03:40 UTCEG score recompute
  2. 2026-08-21 03:40 UTCGHSA enrichment
  3. 2026-08-20 22:56 UTCEPSS rescore
  4. 2026-08-20 16:49 UTCGHSA enrichment
  5. 2026-08-20 05:46 UTCGHSA enrichment
  6. 2026-08-19 18:55 UTCEG score recompute
  7. 2026-08-19 18:55 UTCGHSA enrichment
  8. 2026-08-19 17:04 UTCEPSS rescore
  9. 2026-08-19 07:15 UTCGHSA enrichment
  10. 2026-08-18 20:25 UTCEG score recompute
  11. 2026-08-18 20:25 UTCGHSA enrichment
  12. 2026-08-18 13:48 UTCEPSS rescore
  13. 2026-08-18 09:32 UTCGHSA enrichment
  14. 2026-08-17 22:42 UTCEG score recompute
  15. 2026-08-17 22:42 UTCGHSA enrichment
  16. 2026-08-17 13:47 UTCEPSS rescore
  17. 2026-08-17 11:51 UTCGHSA enrichment
  18. 2026-08-17 01:01 UTCEG score recompute
  19. 2026-08-17 01:01 UTCGHSA enrichment
  20. 2026-08-16 14:56 UTCEPSS rescore
  21. 2026-08-16 14:11 UTCGHSA enrichment
  22. 2026-08-16 03:21 UTCEG score recompute
  23. 2026-08-16 03:21 UTCGHSA enrichment
  24. 2026-08-15 16:31 UTCGHSA enrichment
  25. 2026-08-15 05:41 UTCEG score recompute
Show 47 more
  1. 2026-08-15 05:41 UTCGHSA enrichment
  2. 2026-08-15 01:30 UTCEPSS rescore
  3. 2026-08-14 18:50 UTCGHSA enrichment
  4. 2026-08-14 08:00 UTCEG score recompute
  5. 2026-08-14 08:00 UTCGHSA enrichment
  6. 2026-08-13 22:00 UTCEPSS rescore
  7. 2026-08-13 21:10 UTCGHSA enrichment
  8. 2026-08-13 10:20 UTCGHSA enrichment
  9. 2026-08-12 23:30 UTCEG score recompute
  10. 2026-08-12 23:30 UTCGHSA enrichment
  11. 2026-08-12 13:51 UTCEPSS rescore
  12. 2026-08-12 12:40 UTCGHSA enrichment
  13. 2026-08-12 01:46 UTCGHSA enrichment
  14. 2026-08-11 14:56 UTCEG score recompute
  15. 2026-08-11 14:56 UTCGHSA enrichment
  16. 2026-08-11 04:06 UTCEG score recompute
  17. 2026-08-11 04:06 UTCGHSA enrichment
  18. 2026-08-11 00:00 UTCEPSS rescore
  19. 2026-08-10 17:16 UTCGHSA enrichment
  20. 2026-08-10 06:26 UTCGHSA enrichment
  21. 2026-08-09 19:36 UTCEG score recompute
  22. 2026-08-09 19:36 UTCGHSA enrichment
  23. 2026-08-09 13:47 UTCEPSS rescore
  24. 2026-08-09 08:46 UTCGHSA enrichment
  25. 2026-08-08 21:56 UTCEG score recompute
  26. 2026-08-08 21:56 UTCGHSA enrichment
  27. 2026-08-08 16:37 UTCEPSS rescore
  28. 2026-08-08 11:06 UTCGHSA enrichment
  29. 2026-08-08 00:16 UTCEG score recompute
  30. 2026-08-08 00:16 UTCGHSA enrichment
  31. 2026-08-07 13:26 UTCEG score recompute
  32. 2026-08-07 13:25 UTCGHSA enrichment
  33. 2026-08-07 13:13 UTCEG score recompute
  34. 2026-08-07 13:13 UTCGHSA enrichment
  35. 2026-08-07 11:18 UTCGHSA enrichment
  36. 2026-08-07 00:27 UTCEG score recompute
  37. 2026-08-07 00:27 UTCGHSA enrichment
  38. 2026-08-06 13:47 UTCEPSS rescore
  39. 2026-08-06 13:37 UTCEG score recompute
  40. 2026-08-06 13:37 UTCGHSA enrichment
  41. 2026-08-06 13:09 UTCEG score recompute
  42. 2026-08-06 13:09 UTCGHSA enrichment
  43. 2026-08-06 10:07 UTCEG score recompute
  44. 2026-08-06 10:07 UTCGHSA enrichment
  45. 2026-08-05 23:17 UTCEG score recompute
  46. 2026-08-05 22:35 UTCEG score recompute
  47. 2026-08-05 22:35 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-67863?
CVE-2026-67863 is a high vulnerability published on August 5, 2026. In open62541 1.5.5, a server-side use-after-free exists in the local MonitoredItem callback path. The issue occurs when UASubscriptionlocalPublish continues to use the current UANotification after a callback invokes UAServer_deleteMonitoredItem for the current local MonitoredItem. This allows a…
When was CVE-2026-67863 disclosed?
CVE-2026-67863 was first published in the National Vulnerability Database on August 5, 2026, with the most recent update on August 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-67863 actively exploited?
CVE-2026-67863 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 65.6% of all scored CVEs.
What is the CVSS score of CVE-2026-67863?
CVE-2026-67863 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-67863?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-67863, 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

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