CVE-2026-6390

MEDIUMPre-NVD 6.86.8—
EchelonGraph scoreMEDIUM confidence

Score 6.8 from GitHub Security Advisory published 2026-07-23. a secondary CVSS source baseline 6.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.8Exploit: None knownExposed: 0

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

A flaw was found in GNU nano's multi-buffer error message handling. When a user opens multiple files at startup and one triggers an ALERT-level error, a specially crafted filename containing printf format specifiers can be reinterpreted. This format string vulnerability may allow an attacker to achieve stack information disclosure, cause a denial of service (crash), or potentially perform arbitrary memory writes.

CVSS v3
6.8
EG Score
6.8(medium)
EG Risk
31(Track)
EG Risk 31/100SSVC: 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
Severity68% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

July 23, 2026

Last Modified

September 1, 2026

Advisory Details (2)

Auto-updated Jul 23, 2026
Patch available. Sources: redhat.
redhat

2458767 – (CVE-2026-6390) CVE-2026-6390 nano: GNU nano: Arbitrary memory writes, information disclosure, or denial of service via format string vulnerability in error handling.

https://bugzilla.redhat.com/show_bug.cgi?id=2458767
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-6390

Vendor Advisories for CVE-2026-6390(2)

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

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
nano5.4-2 ... 9.1-1 (28 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
nano7.2-1 ... 9.2-1 (15 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
nano8.4-1 ... 9.2-1 (9 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
nano8.4-1, 8.5-1, 8.6-1, 8.7-1, 8.7.1-19.0-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 78× 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 150 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-6390?
CVE-2026-6390 is a medium vulnerability published on July 23, 2026. A flaw was found in GNU nano's multi-buffer error message handling. When a user opens multiple files at startup and one triggers an ALERT-level error, a specially crafted filename containing printf format specifiers can be reinterpreted. This format string vulnerability may allow an attacker to…
When was CVE-2026-6390 disclosed?
CVE-2026-6390 was first published in the National Vulnerability Database on July 23, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6390 actively exploited?
CVE-2026-6390 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 95.1% of all scored CVEs.
What is the CVSS score of CVE-2026-6390?
CVE-2026-6390 has a CVSS v3 base score of 6.8 (NVD).
How do I remediate CVE-2026-6390?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6390, 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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