CVE-2026-67858

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: 0.9%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.

Buffer Overflow vulnerability exists in open62541 1.5.5 when the Local Discovery Server (LDS) is built with multicast discovery enabled through the MDNSD backend. An unauthenticated remote attacker can send a RegisterServer or RegisterServer2 request containing many unique discoveryUrls. This allows remote attackers to cause a denial of service.

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
0.9%
EPSS %ILE
56th
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 (4)

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

open62541/doc/building.rst at master · open62541/open62541 · GitHub

https://github.com/open62541/open62541/blob/master/doc/building.rst
generic

open62541/src/server/ua_services_discovery.c at master · open62541/open62541 · GitHub

https://github.com/open62541/open62541/blob/master/src/server/ua_services_discovery.c
generic

open62541/examples/discovery at master · open62541/open62541 · GitHub

https://github.com/open62541/open62541/tree/master/examples/discovery
generic

RegisterServer discoveryUrls amplification triggers a `stack-buffer-overflow` in the mDNS probing path of the official `server_lds` example · Issue #8094 · open62541/open62541 · GitHub

https://github.com/open62541/open62541/issues/8094

Vendor Advisories for CVE-2026-67858(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 / 84× 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 202 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-67858?
CVE-2026-67858 is a high vulnerability published on August 4, 2026. Buffer Overflow vulnerability exists in open62541 1.5.5 when the Local Discovery Server (LDS) is built with multicast discovery enabled through the MDNSD backend. An unauthenticated remote attacker can send a RegisterServer or RegisterServer2 request containing many unique discoveryUrls. This…
When was CVE-2026-67858 disclosed?
CVE-2026-67858 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-2026-67858 actively exploited?
CVE-2026-67858 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.9% probability of exploitation in the next 30 days (56th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-67858?
CVE-2026-67858 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-2026-67858?
No fix for CVE-2026-67858 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-2026-67858 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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