CVE-2026-48770

MEDIUMPre-NVD 5.05.0—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1%, top 96% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
5.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.0Exploit: Elevated riskExposed: 0

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

Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, a local process in the same interactive Windows session can send a malformed WM_COPYDATA message to Notepad++ using the COPYDATA_FULL_CMDLINE path. The handler appears to process COPYDATASTRUCT.lpData as an unbounded NUL-terminated wchar_t* instead of enforcing COPYDATASTRUCT.cbData. This vulnerability is fixed in 8.9.6.1.

CVSS v3
5.0
EG Score
5.0(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity50% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
4%
KEV
Not listed

Published

June 26, 2026

Last Modified

June 29, 2026

Advisory Details (2)

Auto-updated Jun 26, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
github Patch Available🟡 PoC Available

Notepad++ WM_COPYDATA COPYDATA_FULL_CMDLINE local DoS crash · Advisory · notepad-plus-plus/notepad-plus-plus · GitHub

https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-r39g-3mcw-xcg2
github_commit

commit f20a0888a92c (notepad-plus-plus/notepad-plus-plus)

Fix landed in notepad-plus-plus/notepad-plus-plus commit f20a0888a92c — awaiting tagged release

https://github.com/notepad-plus-plus/notepad-plus-plus/commit/f20a0888a92ce557a339b833cd9d9d8e97dc797d

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 39× 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 102 total refreshes for this CVE.

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

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCatiilla/Notepad-8.9.6-PoC
    First seen May 28, 2026

    Proof-of-concept scripts for three vulnerabilities in Notepad++ <= 8.9.6, patched in v8.9.6.1 (2026-05-26) CVE-2026-48770 / CVE-2026-48778 / CVE-2026-48800

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-48770?
CVE-2026-48770 is a medium vulnerability published on June 26, 2026. Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, a local process in the same interactive Windows session can send a malformed WMCOPYDATA message to Notepad++ using the COPYDATAFULLCMDLINE path. The handler appears to process COPYDATASTRUCT.lpData as an unbounded…
When was CVE-2026-48770 disclosed?
CVE-2026-48770 was first published in the National Vulnerability Database on June 26, 2026, with the most recent update on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48770 actively exploited?
CVE-2026-48770 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 96.2% of all scored CVEs.
What is the CVSS score of CVE-2026-48770?
CVE-2026-48770 has a CVSS v3 base score of 5.0 (NVD).
How do I remediate CVE-2026-48770?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48770, 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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