CVE-2026-62383

MEDIUMPre-NVD 5.55.5
EchelonGraph scoreMEDIUM confidence

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

Score 5.5 from GitHub Security Advisory published 2026-08-22. A secondary CVSS source baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
5.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

nltk versions before 3.10.2 contain a symlink-based arbitrary file read vulnerability in IPIPANCorpusReader methods that bypass nltk.pathsec validation entirely. Attackers can place a symlink in the corpus root directory and read arbitrary files accessible to the process by calling channels(), domains(), categories(), or fileids() methods with the symlink filename.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
25
EG Risk 25/100

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)
Severity55% × 45%
The EG Score, 5.5 of 10.
Exploitation0.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (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.
EPSS PROB
0.2%
EPSS %ILE
7th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (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 22, 2026

Last Modified

October 14, 2026

Advisory Details (2)

Auto-updated Aug 22, 2026
Patch available. Sources: github.
Web page

nltk IPIPANCorpusReader Symlink Arbitrary File Read | Advisories | VulnCheck

https://www.vulncheck.com/advisories/nltk-ipipancorpusreader-symlink-arbitrary-file-read
GitHub advisoryMentions a patch (unverified)

Symlink-based arbitrary file read in IPIPANCorpusReader, bypasses nltk.pathsec entirely · Advisory · nltk/nltk · GitHub

https://github.com/nltk/nltk/security/advisories/GHSA-3hhw-38pf-pxj6

Vendor Advisories for CVE-2026-62383(1)

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: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
nltk3.10.0, 3.10.1
  • 3.10.0 up to 3.10.2: fixed in 3.10.2
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 46× 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.

  1. 2026-10-14 13:36 UTCEG score recompute
  2. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  3. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  4. 2026-10-12 15:49 UTCEG score recompute
  5. 2026-10-11 19:34 UTCEG score recompute
  6. 2026-10-11 16:49 UTCEG score recompute
  7. 2026-10-11 14:11 UTCEG score recompute
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  9. 2026-10-10 16:36 UTCEG score recompute
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  11. 2026-10-09 05:53 UTCEG score recompute
  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  13. 2026-10-08 04:55 UTCEG score recompute
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  15. 2026-10-07 03:58 UTCEG score recompute
  16. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  17. 2026-10-06 03:01 UTCEG score recompute
  18. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  19. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  20. 2026-10-03 16:39 UTCEG score recompute
  21. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  22. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  23. 2026-10-02 09:29 UTCEG score recompute
  24. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  25. 2026-10-01 08:33 UTCEG score recompute
Show 72 more
  1. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  2. 2026-09-30 07:33 UTCEG score recompute
  3. 2026-09-29 03:19 UTCEG score recompute
  4. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  5. 2026-09-28 02:08 UTCEG score recompute
  6. 2026-09-27 01:08 UTCEG score recompute
  7. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.2% · 7th percentile
  8. 2026-09-24 18:59 UTCEG score recompute
  9. 2026-09-23 16:22 UTCEG score recompute
  10. 2026-09-22 15:25 UTCEG score recompute
  11. 2026-09-21 14:29 UTCEG score recompute
  12. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  13. 2026-09-20 13:33 UTCEG score recompute
  14. 2026-09-19 12:36 UTCEG score recompute
  15. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  16. 2026-09-18 11:39 UTCEG score recompute
  17. 2026-09-17 10:36 UTCEG score recompute
  18. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  19. 2026-09-16 09:34 UTCEG score recompute
  20. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  21. 2026-09-15 07:23 UTCEG score recompute
  22. 2026-09-14 06:26 UTCEG score recompute
  23. 2026-09-13 05:29 UTCEG score recompute
  24. 2026-09-12 04:33 UTCEG score recompute
  25. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  26. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  27. 2026-09-11 03:35 UTCEG score recompute
  28. 2026-09-09 01:42 UTCEG score recompute
  29. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  30. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  31. 2026-09-07 10:14 UTCEG score recompute
  32. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  33. 2026-09-06 09:16 UTCEG score recompute
  34. 2026-09-05 08:07 UTCEG score recompute
  35. 2026-09-04 07:11 UTCEG score recompute
  36. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  37. 2026-09-03 05:57 UTCEG score recompute
  38. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  39. 2026-09-02 05:01 UTCEG score recompute
  40. 2026-09-02 05:00 UTCGHSA enrichmentGHSA-343m-9fqq-97c7 · GitHub CVSS 5.5
  41. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  42. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  43. 2026-09-01 04:04 UTCGHSA enrichmentGHSA-343m-9fqq-97c7 · GitHub CVSS 5.5
  44. 2026-08-31 02:52 UTCEG score recompute
  45. 2026-08-31 02:52 UTCGHSA enrichmentGHSA-343m-9fqq-97c7 · GitHub CVSS 5.5
  46. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  47. 2026-08-30 01:56 UTCEG score recompute
  48. 2026-08-30 01:56 UTCGHSA enrichmentGHSA-343m-9fqq-97c7 · GitHub CVSS 5.5
  49. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  50. 2026-08-29 01:00 UTCEG score recompute
  51. 2026-08-29 01:00 UTCGHSA enrichmentGHSA-343m-9fqq-97c7 · GitHub CVSS 5.5
  52. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  53. 2026-08-27 21:47 UTCGHSA enrichmentGHSA-343m-9fqq-97c7 · GitHub CVSS 5.5
  54. 2026-08-27 20:37 UTCGHSA enrichmentGHSA-343m-9fqq-97c7 · GitHub CVSS 5.5
  55. 2026-08-27 18:24 UTCEG score recompute
  56. 2026-08-27 18:24 UTCGHSA enrichmentGHSA-343m-9fqq-97c7 · GitHub CVSS 5.5
  57. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  58. 2026-08-26 17:25 UTCEG score recompute
  59. 2026-08-26 17:25 UTCGHSA enrichmentGHSA-343m-9fqq-97c7 · GitHub CVSS 5.5
  60. 2026-08-26 16:23 UTCEG score recompute
  61. 2026-08-26 16:23 UTCGHSA enrichmentGHSA-343m-9fqq-97c7 · GitHub CVSS 5.5
  62. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  63. 2026-08-25 18:14 UTCEG score recompute
  64. 2026-08-25 18:14 UTCGHSA enrichmentGHSA-343m-9fqq-97c7 · GitHub CVSS 5.5
  65. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  66. 2026-08-24 17:16 UTCEG score recompute
  67. 2026-08-24 17:16 UTCGHSA enrichmentGHSA-343m-9fqq-97c7 · GitHub CVSS 5.5
  68. 2026-08-23 16:20 UTCEG score recompute
  69. 2026-08-23 16:20 UTCGHSA enrichmentGHSA-343m-9fqq-97c7 · GitHub CVSS 5.5
  70. 2026-08-22 15:24 UTCEG score recompute
  71. 2026-08-22 14:26 UTCEG score recomputeFirst assessed: 5.5 MEDIUM
  72. 2026-08-22 14:25 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-62383?
CVE-2026-62383 is a medium-severity vulnerability; its CVE record was published on August 22, 2026. nltk versions before 3.10.2 contain a symlink-based arbitrary file read vulnerability in IPIPANCorpusReader methods that bypass nltk.pathsec validation entirely. Attackers can place a symlink in the corpus root directory and read arbitrary files accessible to the process by calling channels(),…
When was CVE-2026-62383 made public?
CVE-2026-62383 was made public on August 7, 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 22, 2026. EchelonGraph's copy of the record carries a last-modified date of October 14, 2026; the record at its source may have been updated since.
Is CVE-2026-62383 actively exploited?
CVE-2026-62383 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (7th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-62383?
CVE-2026-62383 has a CVSS base score of 5.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-62383?
A fix for CVE-2026-62383 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-62383 are linked in the Vendor Advisories panel on this page.

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