CVE-2026-78682

HIGHPre-NVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

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, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this weekElevated
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

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
7.5HIGHmedium confidence
EG Risk
65
EG Risk 65/100

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 (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
35th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 25, 2026

Last Modified

October 12, 2026

Advisory Details (2)

Auto-updated Aug 25, 2026
Patch available. Sources: github.
Web page

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 advisoryMentions a patch (unverified)

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(2)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrhoai/odh-llama-stack-core-rhel9:17891212862026-09-30redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
nltk3.10.0-1 ... 3.9.3-1 (9 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
nltk3.10.0-1 ... 3.9.3-1 (6 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
nltk3.10.0-1, 3.10.1-1, 3.9.1-2, 3.9.2-1, 3.9.3-1
  • every version up to 3.10.3-1: fixed in 3.10.3-1
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
nltk0.8 ... 3.9b1 (68 versions)
  • every version up to 3.10.3: fixed in 3.10.3
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 23× in last 7d / 75× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 98 of 136 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat. The 38 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  2. 2026-10-12 21:25 UTCEG score recompute
  3. 2026-10-12 21:25 UTCVendor advisory
  4. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  5. 2026-10-12 15:36 UTCEG score recompute
  6. 2026-10-11 19:22 UTCEG score recompute
  7. 2026-10-11 16:38 UTCEG score recompute
  8. 2026-10-11 13:57 UTCEG score recompute
  9. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  11. 2026-10-10 12:24 UTCEG score recompute
  12. 2026-10-10 12:24 UTCVendor advisory
  13. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  14. 2026-10-09 04:36 UTCEG score recompute
  15. 2026-10-09 04:36 UTCVendor advisory
  16. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  17. 2026-10-08 16:36 UTCEG score recompute
  18. 2026-10-08 16:36 UTCVendor advisory
  19. 2026-10-08 15:41 UTCEG score recompute
  20. 2026-10-08 15:41 UTCVendor advisory
  21. 2026-10-08 03:40 UTCEG score recompute
  22. 2026-10-08 03:40 UTCVendor advisory
  23. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  24. 2026-10-07 07:41 UTCVendor advisory
  25. 2026-10-06 19:44 UTCEG score recompute
Show 73 more
  1. 2026-10-06 19:44 UTCVendor advisory
  2. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  3. 2026-10-06 07:44 UTCEG score recompute
  4. 2026-10-06 07:44 UTCVendor advisory
  5. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  6. 2026-10-05 17:04 UTCVendor advisory
  7. 2026-10-05 04:44 UTCEG score recompute
  8. 2026-10-05 04:44 UTCVendor advisory
  9. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  10. 2026-10-04 16:21 UTCVendor advisory
  11. 2026-10-04 04:24 UTCVendor advisory
  12. 2026-10-03 16:28 UTCEG score recompute
  13. 2026-10-03 16:28 UTCVendor advisory
  14. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  15. 2026-10-02 21:33 UTCEG score recompute
  16. 2026-10-02 21:33 UTCVendor advisory
  17. 2026-10-02 09:09 UTCVendor advisory
  18. 2026-10-01 20:59 UTCEG score recompute
  19. 2026-10-01 20:59 UTCVendor advisory
  20. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  21. 2026-10-01 08:13 UTCVendor advisory
  22. 2026-09-30 20:16 UTCEG score recompute
  23. 2026-09-30 06:55 UTCEG score recompute
  24. 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  25. 2026-09-28 22:24 UTCEG score recompute
  26. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  27. 2026-09-27 22:22 UTCEG score recompute
  28. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  29. 2026-09-26 22:11 UTCEG score recompute
  30. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  31. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  32. 2026-09-24 14:40 UTCEG score recompute
  33. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  34. 2026-09-24 02:15 UTCEG score recompute
  35. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  36. 2026-09-23 02:19 UTCEG score recompute
  37. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  38. 2026-09-22 02:26 UTCEG score recompute
  39. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  40. 2026-09-21 02:29 UTCEG score recompute
  41. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  42. 2026-09-20 02:30 UTCEG score recompute
  43. 2026-09-19 02:30 UTCEG score recompute
  44. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  45. 2026-09-18 02:35 UTCEG score recompute
  46. 2026-09-16 14:15 UTCEG score recompute
  47. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  48. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  49. 2026-09-15 13:38 UTCEG score recompute
  50. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  51. 2026-09-14 01:31 UTCEG score recompute
  52. 2026-09-13 01:37 UTCEG score recompute
  53. 2026-09-12 01:43 UTCEG score recompute
  54. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  55. 2026-09-11 13:46 UTCEG score recompute
  56. 2026-09-10 13:52 UTCEG score recompute
  57. 2026-09-09 01:19 UTCEG score recompute
  58. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  59. 2026-09-07 20:34 UTCEG score recompute
  60. 2026-09-06 20:37 UTCEG score recompute
  61. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  62. 2026-09-05 20:42 UTCEG score recompute
  63. 2026-09-04 20:49 UTCEG score recompute
  64. 2026-09-04 08:41 UTCEG score recompute
  65. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  66. 2026-09-02 20:45 UTCEG score recompute
  67. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  68. 2026-09-02 07:15 UTCGHSA enrichmentGHSA-crp9-r7rq-c8cg · GitHub severity HIGH · GitHub CVSS 7.5
  69. 2026-09-02 07:13 UTCGHSA enrichmentGHSA-crp9-r7rq-c8cg · GitHub severity HIGH · GitHub CVSS 7.5
  70. 2026-09-01 19:12 UTCEG score recompute
  71. 2026-09-01 19:12 UTCGHSA enrichmentGHSA-crp9-r7rq-c8cg · GitHub severity HIGH · GitHub CVSS 7.5
  72. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  73. 2026-09-01 07:11 UTCEG score recompute

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-78682?
CVE-2026-78682 is a high-severity vulnerability; its CVE record was 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 made public?
CVE-2026-78682 was made public on August 11, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on August 25, 2026. EchelonGraph's copy of the record carries a last-modified date of October 12, 2026; the record at its source may have been updated since.
Is CVE-2026-78682 actively exploited?
CVE-2026-78682 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-78682?
CVE-2026-78682 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-78682?
A fix for CVE-2026-78682 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-78682 are linked in the Vendor Advisories panel on this page.

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