CVE-2026-67855

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-05. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
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.

open62541 contains a heap use-after-free in the GDS PushManagement certificate update workflow when UA_ENABLE_GDS_PUSHMANAGEMENT is enabled. This allows a remote attacker to cause a denial of service.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
65(Attend)
EG Risk 65/100SSVC: 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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

August 4, 2026

Last Modified

August 5, 2026

Advisory Details (5)

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

open62541/examples/encryption/server_encryption.c at master · open62541/open62541 · GitHub

https://github.com/open62541/open62541/blob/master/examples/encryption/server_encryption.c
generic

open62541/src/server/ua_server_internal.h at master · open62541/open62541 · GitHub

https://github.com/open62541/open62541/blob/master/src/server/ua_server_internal.h
generic

open62541/arch/posix/eventloop_posix.c at master · open62541/open62541 · GitHub

https://github.com/open62541/open62541/blob/master/arch/posix/eventloop_posix.c
generic

open62541 GDS PushManagement Double-ApplyChanges `Use-After-Free` · Issue #8093 · open62541/open62541 · GitHub

https://github.com/open62541/open62541/issues/8093
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-2026-67855(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 26× in last 7d / 65× 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. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-20 20:31 UTCGHSA enrichment
  3. 2026-08-20 07:44 UTCGHSA enrichment
  4. 2026-08-19 18:57 UTCEG score recompute
  5. 2026-08-19 18:57 UTCGHSA enrichment
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-19 04:36 UTCGHSA enrichment
  8. 2026-08-18 15:49 UTCEG score recompute
  9. 2026-08-18 15:48 UTCGHSA enrichment
  10. 2026-08-18 13:48 UTCEPSS rescore
  11. 2026-08-18 01:38 UTCEG score recompute
  12. 2026-08-18 01:38 UTCGHSA enrichment
  13. 2026-08-17 13:47 UTCEPSS rescore
  14. 2026-08-17 12:51 UTCGHSA enrichment
  15. 2026-08-17 00:04 UTCEG score recompute
  16. 2026-08-17 00:04 UTCGHSA enrichment
  17. 2026-08-16 14:56 UTCEPSS rescore
  18. 2026-08-16 11:16 UTCEG score recompute
  19. 2026-08-16 11:16 UTCGHSA enrichment
  20. 2026-08-15 22:30 UTCGHSA enrichment
  21. 2026-08-15 09:42 UTCEG score recompute
  22. 2026-08-15 09:42 UTCGHSA enrichment
  23. 2026-08-15 01:30 UTCEPSS rescore
  24. 2026-08-14 20:54 UTCGHSA enrichment
  25. 2026-08-14 08:07 UTCEG score recompute
Show 40 more
  1. 2026-08-14 08:07 UTCGHSA enrichment
  2. 2026-08-13 22:00 UTCEPSS rescore
  3. 2026-08-13 19:20 UTCGHSA enrichment
  4. 2026-08-13 06:32 UTCGHSA enrichment
  5. 2026-08-12 17:44 UTCEG score recompute
  6. 2026-08-12 17:44 UTCGHSA enrichment
  7. 2026-08-12 13:51 UTCEPSS rescore
  8. 2026-08-12 04:57 UTCGHSA enrichment
  9. 2026-08-11 16:09 UTCEG score recompute
  10. 2026-08-11 16:09 UTCGHSA enrichment
  11. 2026-08-11 03:22 UTCEG score recompute
  12. 2026-08-11 03:22 UTCGHSA enrichment
  13. 2026-08-11 00:00 UTCEPSS rescore
  14. 2026-08-10 14:35 UTCGHSA enrichment
  15. 2026-08-10 01:47 UTCEG score recompute
  16. 2026-08-10 01:47 UTCGHSA enrichment
  17. 2026-08-09 13:47 UTCEPSS rescore
  18. 2026-08-09 13:01 UTCGHSA enrichment
  19. 2026-08-09 00:14 UTCEG score recompute
  20. 2026-08-09 00:14 UTCGHSA enrichment
  21. 2026-08-08 16:37 UTCEPSS rescore
  22. 2026-08-08 11:26 UTCGHSA enrichment
  23. 2026-08-07 22:39 UTCEG score recompute
  24. 2026-08-07 22:39 UTCGHSA enrichment
  25. 2026-08-07 09:52 UTCGHSA enrichment
  26. 2026-08-06 21:05 UTCEG score recompute
  27. 2026-08-06 21:05 UTCGHSA enrichment
  28. 2026-08-06 13:47 UTCEPSS rescore
  29. 2026-08-06 08:18 UTCEG score recompute
  30. 2026-08-06 08:18 UTCGHSA enrichment
  31. 2026-08-05 19:31 UTCEG score recompute
  32. 2026-08-05 19:31 UTCGHSA enrichment
  33. 2026-08-05 19:17 UTCEPSS rescore
  34. 2026-08-05 19:17 UTCEPSS rescore
  35. 2026-08-05 19:01 UTCEG score recompute▲ 7.50
  36. 2026-08-05 19:01 UTCGHSA enrichment
  37. 2026-08-05 19:00 UTCMITRE cvelistV5CVSS v3 → 7.5 · severity → HIGH
  38. 2026-08-04 22:31 UTCNVD update
  39. 2026-08-04 21:43 UTCEG score recompute
  40. 2026-08-04 21:40 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-67855?
CVE-2026-67855 is a high vulnerability published on August 4, 2026. open62541 contains a heap use-after-free in the GDS PushManagement certificate update workflow when UAENABLEGDS_PUSHMANAGEMENT is enabled. This allows a remote attacker to cause a denial of service.
When was CVE-2026-67855 disclosed?
CVE-2026-67855 was first published in the National Vulnerability Database on August 4, 2026, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-67855 actively exploited?
CVE-2026-67855 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 78.4% of all scored CVEs.
What is the CVSS score of CVE-2026-67855?
CVE-2026-67855 has a CVSS v3.1 base score of 7.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-67855?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-67855, 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-2026-67855

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