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CVE-2026-62383— nltk IPIPANCorpusReader Symlink Arbitrary File Read

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 3.10.2之前版本存在路径遍历漏洞，该漏洞源于IPIPANCorpusReader方法绕过nltk.pathsec验证，攻击者可在语料库根目录放置符号链接，通过调用channels()、domains()、categories()或fileids()方法读取进程可访问的任意文件。

CVSS 5.5 · Medium EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1560.001 · Archive via Utility

Affected Version Matrix 2

VendorProduct Version RangeStatus
nltk nltk 3.10.0< 3.10.2 affected
3.10.2 unaffected
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I. Basic Information for CVE-2026-62383

Vulnerability Information
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Vulnerability Title
nltk IPIPANCorpusReader Symlink Arbitrary File Read
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
NLTK 路径遍历漏洞
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 3.10.2之前版本存在路径遍历漏洞，该漏洞源于IPIPANCorpusReader方法绕过nltk.pathsec验证，攻击者可在语料库根目录放置符号链接，通过调用channels()、domains()、categories()或fileids()方法读取进程可访问的任意文件。
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 3.10.0 ~ 3.10.2 -

II. Public POCs for CVE-2026-62383

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III. Intelligence Information for CVE-2026-62383

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Vendor Advisories for CVE-2026-62383 (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-2026-62385 5.9 MEDIUM NLTK 3.9.4 Path Traversal via FrameNet and NKJP Readers
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-22

V. Comments for CVE-2026-62383

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