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CVE-2026-54293— NLTK: URL-Encoded Path Traversal in nltk.data.load() Allows Arbitrary Local File Read

Quick assessment

Affected
nltk nltk
Exploitation
Public or AI PoC available; prioritize validation
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工具包。用于支持自然语言处理的研究和开发。 NLTK 3.10.0-rc1之前版本存在路径遍历漏洞，该漏洞源于在nltk: URL方案下对URL编码路径分隔符和遍历段进行解码前检查（TOCTOU风格缺陷），导致路径遍历漏洞，允许攻击者绕过安全保护并读取任意文件。

CVSS 7.5 · High EPSS 0.63% · P48

Affected Version Matrix 1

VendorProduct Version RangeStatus
nltk nltk < 3.10.0-rc1 affected
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I. Basic Information for CVE-2026-54293

Vulnerability Information
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Vulnerability Title
NLTK: URL-Encoded Path Traversal in nltk.data.load() Allows Arbitrary Local File Read
Source: CVE Program / CVE List V5
Vulnerability Description
NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials supporting research and development in Natural Language Processing. Prior to 3.10.0-rc1, nltk.data.load() in NLTK is vulnerable to path traversal via URL-encoded path separators and traversal segments when using the nltk: URL scheme. The unsafe-path regex check is performed before url2pathname() decodes the %xx sequences (a classic decode-after-check / TOCTOU-style flaw), allowing an attacker to bypass the protection documented in NLTK's SECURITY.md and read arbitrary files from the filesystem. While literal traversal strings such as ../../../etc/passwd are correctly blocked, encoded variants such as %2fetc%2fpasswd, %2e%2e%2f..., and ..%2f..%2f slip past the regex and are subsequently decoded into a real filesystem path. This vulnerability is fixed in 3.10.0-rc1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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工具包。用于支持自然语言处理的研究和开发。 NLTK 3.10.0-rc1之前版本存在路径遍历漏洞，该漏洞源于在nltk: URL方案下对URL编码路径分隔符和遍历段进行解码前检查（TOCTOU风格缺陷），导致路径遍历漏洞，允许攻击者绕过安全保护并读取任意文件。
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-rc1 -

II. Public POCs for CVE-2026-54293

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8128 chars
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III. Intelligence Information for CVE-2026-54293

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Patches & Fixes for CVE-2026-54293 (1)

Vendor Advisories for CVE-2026-54293 (1)

IV. Related Vulnerabilities

Same product: nltk
Same vendor: nltk
Same weakness: CWE-22

V. Comments for CVE-2026-54293

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