CVE-2026-65609

LOWPre-NVD 2.42.4—
EchelonGraph scoreMEDIUM confidence

This low-severity CVE scores 2.4 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1% (3rd percentile of EPSS-scored CVEs). 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
Trending — 3 sources updated this week
2.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 2.4Exploit: None knownExposed services: Not assessed

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

nnn is vulnerable to Out-of-Bound write vulnerability. Due to lack of validation of attacker-controlled length fields deserialized from a session file, a crafted session file can cause nnn to write data beyond the bounds of fixed-size global buffers when loaded with the -s option. An attacker who can place a malicious session file in the victim's nnn session directory can exploit this to corrupt adjacent global state.

Maintainer of this project was notified about this vulnerability. It might has been addressed, but the maintainer did not provide a vulnerable version range. Only version 5.2 was tested and confirmed as vulnerable.

CVSS v3
2.4
EG Score
2.4LOWmedium confidence
EG Risk
11
EG Risk 11/100CISA 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
Severity24% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
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
0.1%
EPSS %ILE
3rd
KEV
Not listed

CISA SSVCTrack at every mission impact level.

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 none (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 19, 2026

Last Modified

August 28, 2026

References (1)

Vendor Advisories for CVE-2026-65609(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
nnn4.7-1 ... 5.3-1 (7 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
nnn5.0-1, 5.1-1, 5.2-1, 5.3-1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
nnn5.0-1, 5.1-1, 5.2-1, 5.3-1
  • 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 10× in last 7d / 34× 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. 2026-10-04 23:22 UTCEPSS rescore
  2. 2026-10-03 16:59 UTCEG score recompute
  3. 2026-10-03 16:59 UTCGHSA enrichment
  4. 2026-10-03 14:26 UTCEPSS rescore
  5. 2026-10-02 17:56 UTCEPSS rescore
  6. 2026-10-01 19:50 UTCEPSS rescore
  7. 2026-09-30 15:03 UTCEPSS rescore
  8. 2026-09-30 11:57 UTCEG score recompute
  9. 2026-09-30 11:57 UTCGHSA enrichment
  10. 2026-09-28 13:51 UTCEPSS rescore
  11. 2026-09-27 07:09 UTCEG score recompute
  12. 2026-09-27 07:09 UTCGHSA enrichment
  13. 2026-09-26 15:59 UTCEPSS rescore
  14. 2026-09-23 17:54 UTCEPSS rescore
  15. 2026-09-23 06:57 UTCEG score recompute
  16. 2026-09-23 06:57 UTCGHSA enrichment
  17. 2026-09-20 02:23 UTCEG score recompute
  18. 2026-09-20 02:22 UTCGHSA enrichment
  19. 2026-09-18 19:28 UTCEPSS rescore
  20. 2026-09-16 21:48 UTCEG score recompute
  21. 2026-09-16 21:48 UTCGHSA enrichment
  22. 2026-09-16 14:08 UTCEPSS rescore
  23. 2026-09-16 05:15 UTCEPSS rescore
  24. 2026-09-13 16:53 UTCEG score recompute
  25. 2026-09-13 16:53 UTCGHSA enrichment
Show 38 more
  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-10 12:19 UTCEG score recompute
  3. 2026-09-10 12:19 UTCGHSA enrichment
  4. 2026-09-08 22:01 UTCEPSS rescore
  5. 2026-09-07 16:01 UTCEPSS rescore
  6. 2026-09-07 06:05 UTCEG score recompute
  7. 2026-09-07 06:05 UTCGHSA enrichment
  8. 2026-09-06 13:47 UTCEPSS rescore
  9. 2026-09-05 15:31 UTCEPSS rescore
  10. 2026-09-04 05:07 UTCEPSS rescore
  11. 2026-09-04 01:27 UTCEG score recompute
  12. 2026-09-04 01:27 UTCGHSA enrichment
  13. 2026-09-02 14:12 UTCEPSS rescore
  14. 2026-09-01 13:54 UTCEPSS rescore
  15. 2026-09-01 04:40 UTCEPSS rescore
  16. 2026-08-31 20:52 UTCEG score recompute
  17. 2026-08-31 20:52 UTCGHSA enrichment
  18. 2026-08-30 19:17 UTCEPSS rescore
  19. 2026-08-30 01:22 UTCEPSS rescore
  20. 2026-08-28 21:42 UTCEPSS rescore
  21. 2026-08-28 15:55 UTCEG score recompute
  22. 2026-08-28 15:55 UTCGHSA enrichment
  23. 2026-08-27 01:46 UTCEG score recompute
  24. 2026-08-27 01:46 UTCGHSA enrichment
  25. 2026-08-26 14:47 UTCEPSS rescore
  26. 2026-08-25 13:49 UTCEPSS rescore
  27. 2026-08-23 21:12 UTCEG score recompute
  28. 2026-08-23 21:12 UTCGHSA enrichment
  29. 2026-08-23 00:19 UTCEPSS rescore
  30. 2026-08-21 23:49 UTCEPSS rescore
  31. 2026-08-20 22:56 UTCEPSS rescore
  32. 2026-08-20 16:38 UTCEG score recompute
  33. 2026-08-20 16:38 UTCGHSA enrichment
  34. 2026-08-20 16:08 UTCEG score recompute
  35. 2026-08-20 16:08 UTCGHSA enrichment
  36. 2026-08-19 14:26 UTCEG score recompute
  37. 2026-08-19 13:38 UTCEG score recompute
  38. 2026-08-19 13:37 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-65609?
CVE-2026-65609 is a low vulnerability published on August 19, 2026. nnn is vulnerable to Out-of-Bound write vulnerability. Due to lack of validation of attacker-controlled length fields deserialized from a session file, a crafted session file can cause nnn to write data beyond the bounds of fixed-size global buffers when loaded with the -s option. An attacker who…
When was CVE-2026-65609 disclosed?
CVE-2026-65609 was first published on August 19, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-65609 actively exploited?
CVE-2026-65609 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (3rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-65609?
CVE-2026-65609 has a CVSS base score of 2.4 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-65609?
No fix for CVE-2026-65609 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-2026-65609 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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