CVE-2026-67857

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-05. 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.

open62541 1.5.5 contains an out-of-bounds read in the client-side function responseReadNamespacesArray() in src/client/ua_client_connect.c.

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
28%
KEV
Not listed

Published

August 4, 2026

Last Modified

August 5, 2026

Advisory Details (5)

Auto-updated Aug 4, 2026
No patch confirmed yet.
generic

`client out-of-bounds` read in `responseReadNamespacesArray()` when processing a zero-length `ReadResponse.results` array encoded with `UA_EMPTY_ARRAY_SENTINEL` · Issue #9 · gff-cw/information · GitHub

https://github.com/gff-cw/information/issues/9
generic

open62541/examples/client_connect_loop.c at v1.5.5 · open62541/open62541 · GitHub

https://github.com/open62541/open62541/blob/v1.5.5/examples/client_connect_loop.c
generic

open62541/examples/client_connect.c at v1.5.5 · open62541/open62541 · GitHub

https://github.com/open62541/open62541/blob/v1.5.5/examples/client_connect.c
generic

open62541/src/client/ua_client_connect.c at v1.5.5 · open62541/open62541 · GitHub

https://github.com/open62541/open62541/blob/v1.5.5/src/client/ua_client_connect.c
generic

Client `OOB read` in NamespaceArray ReadResponse handling · Issue #8104 · open62541/open62541 · GitHub

https://github.com/open62541/open62541/issues/8104

Vendor Advisories for CVE-2026-67857(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 27× 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 08:33 UTCGHSA enrichment
  2. 2026-08-19 19:57 UTCEG score recompute
  3. 2026-08-19 19:57 UTCGHSA enrichment
  4. 2026-08-19 17:04 UTCEPSS rescore
  5. 2026-08-19 07:20 UTCGHSA enrichment
  6. 2026-08-18 18:44 UTCEG score recompute
  7. 2026-08-18 18:44 UTCGHSA enrichment
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-18 06:06 UTCGHSA enrichment
  10. 2026-08-17 17:29 UTCEG score recompute
  11. 2026-08-17 17:29 UTCGHSA enrichment
  12. 2026-08-17 13:47 UTCEPSS rescore
  13. 2026-08-17 04:49 UTCGHSA enrichment
  14. 2026-08-16 16:12 UTCEG score recompute
  15. 2026-08-16 16:12 UTCGHSA enrichment
  16. 2026-08-16 14:56 UTCEPSS rescore
  17. 2026-08-16 03:36 UTCEG score recompute
  18. 2026-08-16 03:36 UTCGHSA enrichment
  19. 2026-08-15 15:00 UTCGHSA enrichment
  20. 2026-08-15 02:23 UTCEG score recompute
  21. 2026-08-15 02:23 UTCGHSA enrichment
  22. 2026-08-15 01:30 UTCEPSS rescore
  23. 2026-08-14 13:47 UTCGHSA enrichment
  24. 2026-08-14 01:11 UTCEG score recompute
  25. 2026-08-14 01:11 UTCGHSA enrichment
Show 40 more
  1. 2026-08-13 22:00 UTCEPSS rescore
  2. 2026-08-13 12:35 UTCGHSA enrichment
  3. 2026-08-12 23:59 UTCEG score recompute
  4. 2026-08-12 23:59 UTCGHSA enrichment
  5. 2026-08-12 13:51 UTCEPSS rescore
  6. 2026-08-12 11:23 UTCGHSA enrichment
  7. 2026-08-11 22:47 UTCEG score recompute
  8. 2026-08-11 22:46 UTCGHSA enrichment
  9. 2026-08-11 10:09 UTCEG score recompute
  10. 2026-08-11 10:09 UTCGHSA enrichment
  11. 2026-08-11 00:00 UTCEPSS rescore
  12. 2026-08-10 21:33 UTCGHSA enrichment
  13. 2026-08-10 08:55 UTCGHSA enrichment
  14. 2026-08-09 20:19 UTCEG score recompute
  15. 2026-08-09 20:19 UTCGHSA enrichment
  16. 2026-08-09 13:47 UTCEPSS rescore
  17. 2026-08-09 07:43 UTCGHSA enrichment
  18. 2026-08-08 19:07 UTCEG score recompute
  19. 2026-08-08 19:07 UTCGHSA enrichment
  20. 2026-08-08 16:37 UTCEPSS rescore
  21. 2026-08-08 06:30 UTCGHSA enrichment
  22. 2026-08-07 17:54 UTCEG score recompute
  23. 2026-08-07 17:54 UTCGHSA enrichment
  24. 2026-08-07 05:18 UTCGHSA enrichment
  25. 2026-08-06 16:42 UTCEG score recompute
  26. 2026-08-06 16:42 UTCGHSA enrichment
  27. 2026-08-06 13:47 UTCEPSS rescore
  28. 2026-08-06 04:06 UTCEG score recompute
  29. 2026-08-06 04:06 UTCGHSA enrichment
  30. 2026-08-05 19:17 UTCEPSS rescore
  31. 2026-08-05 19:17 UTCEPSS rescore
  32. 2026-08-05 15:30 UTCEG score recompute
  33. 2026-08-05 15:30 UTCGHSA enrichment
  34. 2026-08-05 14:38 UTCEG score recompute
  35. 2026-08-05 14:38 UTCGHSA enrichment
  36. 2026-08-05 11:10 UTCEG score recompute
  37. 2026-08-05 11:09 UTCGHSA enrichment
  38. 2026-08-04 22:32 UTCEG score recompute
  39. 2026-08-04 21:43 UTCEG score recompute
  40. 2026-08-04 21:40 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-67857?
CVE-2026-67857 is a high vulnerability published on August 4, 2026. open62541 1.5.5 contains an out-of-bounds read in the client-side function responseReadNamespacesArray() in src/client/uaclientconnect.c.
When was CVE-2026-67857 disclosed?
CVE-2026-67857 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-2026-67857 actively exploited?
CVE-2026-67857 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 71.8% of all scored CVEs.
What is the CVSS score of CVE-2026-67857?
CVE-2026-67857 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-67857?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-67857, 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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