CVE-2026-78682

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-25. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

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

NLTK before 3.10.3 contains a server-side request forgery vulnerability in nltk.pathsec.urlopen (and callers nltk.data.load, nltk.downloader.Downloader.index/download) when an HTTP proxy is configured. pathsec.urlopen validates the requested hostname locally, but proxy-handler inheritance disables the safe HTTP/HTTPS handlers so the actual fetch is performed by the proxy against a destination that is never re-validated. An attacker can supply a validated public URL that the proxy forwards to an internal loopback-only service, allowing disclosure of internal HTTP resources, loading of forged downloader indexes, and installation of attacker-chosen package content.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

August 25, 2026

Last Modified

August 28, 2026

Advisory Details (2)

Auto-updated Aug 25, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

NLTK before 3.10.3 SSRF Protection Bypass via Proxy | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nltk-before-ssrf-protection-bypass-via-proxy
github Patch Available🟡 PoC Available

pathsec SSRF protection can be bypassed when a proxy is configured · Advisory · nltk/nltk · GitHub

https://github.com/nltk/nltk/security/advisories/GHSA-6ww7-3frv-cqxh

Vendor Advisories for CVE-2026-78682(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 26× in last 7d / 26× 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 19:09 UTCGHSA enrichment
  3. 2026-08-29 07:07 UTCEG score recompute
  4. 2026-08-29 07:07 UTCGHSA enrichment
  5. 2026-08-28 21:42 UTCEPSS rescore
  6. 2026-08-28 19:08 UTCGHSA enrichment
  7. 2026-08-28 16:23 UTCGHSA enrichment
  8. 2026-08-28 04:23 UTCGHSA enrichment
  9. 2026-08-27 16:25 UTCEG score recompute
  10. 2026-08-27 16:25 UTCGHSA enrichment
  11. 2026-08-27 14:25 UTCEPSS rescore
  12. 2026-08-27 04:25 UTCGHSA enrichment
  13. 2026-08-26 16:24 UTCEG score recompute
  14. 2026-08-26 16:24 UTCGHSA enrichment
  15. 2026-08-26 14:47 UTCEPSS rescore
  16. 2026-08-26 04:21 UTCGHSA enrichment
  17. 2026-08-25 16:24 UTCEG score recompute
  18. 2026-08-25 16:24 UTCGHSA enrichment
  19. 2026-08-25 15:30 UTCEG score recompute
  20. 2026-08-25 15:30 UTCGHSA enrichment
  21. 2026-08-25 14:16 UTCEG score recompute
  22. 2026-08-25 14:16 UTCGHSA enrichment
  23. 2026-08-25 13:49 UTCEPSS rescore
  24. 2026-08-25 02:19 UTCEG score recompute
  25. 2026-08-25 01:50 UTCEG score recompute
Show 1 more
  1. 2026-08-25 01:50 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-78682?
CVE-2026-78682 is a high vulnerability published on August 25, 2026. NLTK before 3.10.3 contains a server-side request forgery vulnerability in nltk.pathsec.urlopen (and callers nltk.data.load, nltk.downloader.Downloader.index/download) when an HTTP proxy is configured. pathsec.urlopen validates the requested hostname locally, but proxy-handler inheritance disables…
When was CVE-2026-78682 disclosed?
CVE-2026-78682 was first published in the National Vulnerability Database on August 25, 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-2026-78682 actively exploited?
CVE-2026-78682 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 84.4% of all scored CVEs.
What is the CVSS score of CVE-2026-78682?
CVE-2026-78682 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-78682?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78682, 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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