CVE-2026-67857

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM 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 mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 7.5Exploit: Elevated riskExposed services: Not assessed

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

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
7.5HIGHmedium confidence
EG Risk
50
EG Risk 50/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.6%
EPSS %ILE
48th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 4, 2026

Last Modified

August 31, 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 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(1)

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

Data Freshness Timeline

(refreshed 18× in last 7d / 85× 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 200 total refreshes for this CVE.

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

Related CVEs(same product + 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 on August 4, 2026, with the most recent update 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-2026-67857 actively exploited?
CVE-2026-67857 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (48th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-67857?
CVE-2026-67857 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-2026-67857?
No fix for CVE-2026-67857 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-67857 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-67857

Explore →

Is Your Infrastructure Affected by CVE-2026-67857?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs