CVE-2026-86509

CRITICALPre-NVD 9.69.6—
EchelonGraph scoreHIGH confidence

Score 9.6 from GitHub Security Advisory (severity: HIGH) published 2026-09-08. a secondary CVSS source baseline 9.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
9.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.6Exploit: Elevated riskExposed: 0

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

A flaw has been found in D-Link DIR-895L A1_102b07. This impacts the function sendOffer/sendACK of the file udhcpcd/serverpacket.c of the component udhcpcd. This manipulation causes stack-based buffer overflow. The attack can only be done within the local network. The exploit has been published and may be used.

CVSS v3
9.6
EG Score
9.6(high)
EG Risk
59(Track*)
EG Risk 59/100SSVC: 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
Severity96% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
52%
KEV
Not listed

Published

September 8, 2026

Last Modified

September 11, 2026

Advisory Details (2)

Auto-updated Sep 22, 2026
No patch confirmed yet.
generic

Smart Home, SMB and Enterprise solutions | D-Link

https://www.dlink.com/
generic

Notion

https://tzh00203.notion.site/D-Link-DIR-895L-Stack-Overflow-in-udhcpd-TR-111-Option-125-Parsing-33cb5c52018a80dc8140e1502e4814d0

Vendor Advisories for CVE-2026-86509(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 56× in last 7d / 146× 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 146 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86509?
CVE-2026-86509 is a critical vulnerability published on September 8, 2026. A flaw has been found in D-Link DIR-895L A1_102b07. This impacts the function sendOffer/sendACK of the file udhcpcd/serverpacket.c of the component udhcpcd. This manipulation causes stack-based buffer overflow. The attack can only be done within the local network. The exploit has been published and…
When was CVE-2026-86509 disclosed?
CVE-2026-86509 was first published in the National Vulnerability Database on September 8, 2026, with the most recent update on September 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86509 actively exploited?
CVE-2026-86509 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 48.1% of all scored CVEs.
What is the CVSS score of CVE-2026-86509?
CVE-2026-86509 has a CVSS v3 base score of 9.6 (NVD).
How do I remediate CVE-2026-86509?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86509, 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.

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