CVE-2026-65915

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-22. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: Elevated riskExposed: 0

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

NLTK versions before 3.10.0 contain a logic bug in FileSystemPathPointer.open() where the sandbox validation check compares a normalized path against itself, making the security check permanently inert. Attackers can pass file:// URLs to nltk.data.load() to read arbitrary files accessible to the process user, including credentials and configuration files.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
45(Track)
EG Risk 45/100SSVC: 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
Severity65% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
21%
KEV
Not listed

Published

August 22, 2026

Last Modified

August 28, 2026

Advisory Details (2)

Auto-updated Aug 22, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

NLTK before 3.10.0 Arbitrary File Read via FileSystemPathPointer | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nltk-before-arbitrary-file-read-via-filesystempathpointer
github Patch Available🟡 PoC Available

FileSystemPathPointer.open() sandbox check is dead code — arbitrary file read via file:// protocol · Advisory · nltk/nltk · GitHub

https://github.com/nltk/nltk/security/advisories/GHSA-72r2-7mfr-5xr9

Vendor Advisories for CVE-2026-65915(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 22× in last 7d / 25× 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. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 18:08 UTCEG score recompute
  3. 2026-08-29 18:07 UTCGHSA enrichment
  4. 2026-08-28 21:42 UTCEPSS rescore
  5. 2026-08-28 19:09 UTCGHSA enrichment
  6. 2026-08-28 18:03 UTCGHSA enrichment
  7. 2026-08-27 18:18 UTCEG score recompute
  8. 2026-08-27 18:18 UTCGHSA enrichment
  9. 2026-08-26 18:21 UTCEG score recompute
  10. 2026-08-26 18:20 UTCGHSA enrichment
  11. 2026-08-26 14:47 UTCEPSS rescore
  12. 2026-08-25 19:22 UTCEG score recompute
  13. 2026-08-25 19:22 UTCGHSA enrichment
  14. 2026-08-25 13:49 UTCEPSS rescore
  15. 2026-08-24 20:26 UTCEG score recompute
  16. 2026-08-24 20:26 UTCGHSA enrichment
  17. 2026-08-24 19:36 UTCEG score recompute
  18. 2026-08-24 19:36 UTCGHSA enrichment
  19. 2026-08-24 13:16 UTCEG score recompute
  20. 2026-08-24 13:16 UTCGHSA enrichment
  21. 2026-08-23 14:20 UTCEG score recompute
  22. 2026-08-23 14:20 UTCGHSA enrichment
  23. 2026-08-22 15:24 UTCEG score recompute
  24. 2026-08-22 14:26 UTCEG score recompute
  25. 2026-08-22 14:25 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-65915?
CVE-2026-65915 is a medium vulnerability published on August 22, 2026. NLTK versions before 3.10.0 contain a logic bug in FileSystemPathPointer.open() where the sandbox validation check compares a normalized path against itself, making the security check permanently inert. Attackers can pass file:// URLs to nltk.data.load() to read arbitrary files accessible to the…
When was CVE-2026-65915 disclosed?
CVE-2026-65915 was first published in the National Vulnerability Database on August 22, 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-2026-65915 actively exploited?
CVE-2026-65915 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 79.3% of all scored CVEs.
What is the CVSS score of CVE-2026-65915?
CVE-2026-65915 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-65915?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-65915, 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

Explore the affected products and dependency analysis for CVE-2026-65915

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