CVE-2026-67858

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.

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
7.5(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
40%
KEV
Not listed

Published

August 4, 2026

Last Modified

August 5, 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 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 28× in last 7d / 67× 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 21:10 UTCGHSA enrichment
  3. 2026-08-20 09:23 UTCGHSA enrichment
  4. 2026-08-19 21:36 UTCEG score recompute
  5. 2026-08-19 21:36 UTCGHSA enrichment
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-19 09:30 UTCGHSA enrichment
  8. 2026-08-18 21:43 UTCEG score recompute
  9. 2026-08-18 21:43 UTCGHSA enrichment
  10. 2026-08-18 13:48 UTCEPSS rescore
  11. 2026-08-18 09:53 UTCGHSA enrichment
  12. 2026-08-17 22:05 UTCEG score recompute
  13. 2026-08-17 22:05 UTCGHSA enrichment
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-17 10:16 UTCGHSA enrichment
  16. 2026-08-16 22:30 UTCEG score recompute
  17. 2026-08-16 22:30 UTCGHSA enrichment
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 10:42 UTCEG score recompute
  20. 2026-08-16 10:42 UTCGHSA enrichment
  21. 2026-08-15 22:56 UTCGHSA enrichment
  22. 2026-08-15 11:09 UTCEG score recompute
  23. 2026-08-15 11:09 UTCGHSA enrichment
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-14 23:21 UTCGHSA enrichment
Show 42 more
  1. 2026-08-14 11:34 UTCGHSA enrichment
  2. 2026-08-13 23:48 UTCEG score recompute
  3. 2026-08-13 23:48 UTCGHSA enrichment
  4. 2026-08-13 22:00 UTCEPSS rescore
  5. 2026-08-13 12:00 UTCGHSA enrichment
  6. 2026-08-13 00:13 UTCEG score recompute
  7. 2026-08-13 00:13 UTCGHSA enrichment
  8. 2026-08-12 13:51 UTCEPSS rescore
  9. 2026-08-12 12:26 UTCGHSA enrichment
  10. 2026-08-12 00:39 UTCEG score recompute
  11. 2026-08-12 00:39 UTCGHSA enrichment
  12. 2026-08-11 12:52 UTCGHSA enrichment
  13. 2026-08-11 01:05 UTCGHSA enrichment
  14. 2026-08-10 13:18 UTCGHSA enrichment
  15. 2026-08-10 01:31 UTCEG score recompute
  16. 2026-08-10 01:31 UTCGHSA enrichment
  17. 2026-08-09 13:47 UTCEPSS rescore
  18. 2026-08-09 13:44 UTCGHSA enrichment
  19. 2026-08-09 01:58 UTCEG score recompute
  20. 2026-08-09 01:58 UTCGHSA enrichment
  21. 2026-08-08 16:37 UTCEPSS rescore
  22. 2026-08-08 14:11 UTCGHSA enrichment
  23. 2026-08-08 02:24 UTCEG score recompute
  24. 2026-08-08 02:24 UTCGHSA enrichment
  25. 2026-08-07 14:37 UTCGHSA enrichment
  26. 2026-08-07 02:50 UTCGHSA enrichment
  27. 2026-08-06 15:04 UTCEG score recompute
  28. 2026-08-06 15:04 UTCGHSA enrichment
  29. 2026-08-06 13:47 UTCEPSS rescore
  30. 2026-08-06 03:17 UTCEG score recompute
  31. 2026-08-06 03:17 UTCGHSA enrichment
  32. 2026-08-05 19:17 UTCEPSS rescore
  33. 2026-08-05 19:17 UTCEPSS rescore
  34. 2026-08-05 15:30 UTCEG score recompute
  35. 2026-08-05 15:30 UTCGHSA enrichment
  36. 2026-08-05 14:38 UTCEG score recompute
  37. 2026-08-05 14:38 UTCGHSA enrichment
  38. 2026-08-05 10:24 UTCEG score recompute
  39. 2026-08-05 10:24 UTCGHSA enrichment
  40. 2026-08-04 22:32 UTCEG score recompute
  41. 2026-08-04 21:42 UTCEG score recompute
  42. 2026-08-04 21:40 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

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 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-2026-67858 actively exploited?
CVE-2026-67858 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 60.0% of all scored CVEs.
What is the CVSS score of CVE-2026-67858?
CVE-2026-67858 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-67858?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-67858, 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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