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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 版本低于 3.10.2 存在一个基于符号链接的任意文件读取漏洞。该漏洞位于 IPIPANCorpusReader 类的方法中，可完全绕过 nltk.pathsec 的安全验证机制。攻击者可以在语料库根目录中放置一个符号链接，然后通过调用 channels()、domains()、categories() 或 fileids() 方法，并传入该符号链接的文件名，从而读取进程有权访问的任意文件。

CVSS 5.5 · Medium EPSS 0.18% · P8

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

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 · 12 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 pathsec
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-2026-63310 7.1 HIGH NLTK before 3.9.3 Missing Post-Download Integrity Verification
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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