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CVE-2026-62385— NLTK 3.9.4 Path Traversal via FrameNet and NKJP Readers

Quick assessment

Affected
nltk nltk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

NLTK是NLTK组织开源的一个自然语言处理工具包。 NLTK 3.10.0之前版本存在输入验证错误漏洞，该漏洞源于FramenetCorpusReader和NKJPCorpusReader存在路径遍历，攻击者可通过提供不安全的selectors或恶意的索引状态，利用frame_by_name、doc、lu和header方法及特制参数解析语料库根目录之外的XML文件，读取应用程序可访问的任意XML文件。

CVSS 5.9 · Medium EPSS 0.42% · P35

Possible ATT&CK Techniques 1 AI

T1555 · Credentials from Password Stores

Affected Version Matrix 2

VendorProduct Version RangeStatus
nltk nltk < 3.10.0 affected
3.10.0 unaffected
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I. Basic Information for CVE-2026-62385

Vulnerability Information
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Vulnerability Title
NLTK 3.9.4 Path Traversal via FrameNet and NKJP Readers
Source: CVE Program / CVE List V5
Vulnerability Description
NLTK versions before 3.10.0 contain a path traversal vulnerability in FramenetCorpusReader and NKJPCorpusReader that allows attackers to parse XML files outside the corpus root by supplying unsafe selectors or poisoned index state. Attackers can exploit frame_by_name, doc, lu, and header methods with crafted parameters to read arbitrary XML files accessible to the application.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
文件名或路径的外部可控制
Source: CVE Program / CVE List V5
Vulnerability Title
NLTK 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NLTK是NLTK组织开源的一个自然语言处理工具包。 NLTK 3.10.0之前版本存在输入验证错误漏洞，该漏洞源于FramenetCorpusReader和NKJPCorpusReader存在路径遍历，攻击者可通过提供不安全的selectors或恶意的索引状态，利用frame_by_name、doc、lu和header方法及特制参数解析语料库根目录之外的XML文件，读取应用程序可访问的任意XML文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nltk nltk 0 ~ 3.10.0 -

II. Public POCs for CVE-2026-62385

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III. Intelligence Information for CVE-2026-62385

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Vendor Advisories for CVE-2026-62385 (2)

Same Patch Batch · nltk · 2026-08-22 · 11 CVEs total

CVE-2026-71513 8.8 HIGH NLTK 3.10.0 through 3.10.2 Remote Code Execution via AllowlistUnpickler Dotted-Name Bypass
CVE-2026-62388 7.5 HIGH NLTK before 3.10.0 Insecure Default Configuration in pathsec.py
CVE-2026-62384 7.5 HIGH NLTK FramenetCorpusReader Symlink Sandbox Bypass before 3.10.2
CVE-2026-66393 7.5 HIGH NLTK before 3.9.4 Denial of Service via JSONTaggedDecoder
CVE-2026-63312 7.5 HIGH NLTK StreamBackedCorpusView Bypasses pathsec.ENFORCE Arbitrary File Read
CVE-2026-65915 6.5 MEDIUM NLTK before 3.10.0 Arbitrary File Read via FileSystemPathPointer
CVE-2026-70626 6.2 MEDIUM NLTK before 3.9.4 Symlink Escape via CorpusReader
CVE-2026-62383 5.5 MEDIUM nltk IPIPANCorpusReader Symlink Arbitrary File Read
CVE-2026-63311 5.3 MEDIUM NLTK before 3.10.0 SSRF via DNS Resolution Failure
CVE-2026-71514 2.5 LOW NLTK 3.9.4 through 3.10.2 Path Traversal via CrubadanCorpusReader pathsec Bypass

IV. Related Vulnerabilities

Same product: nltk
Same vendor: nltk
Same weakness: CWE-73

V. Comments for CVE-2026-62385

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