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CVE-2026-79676— NLTK before 3.10.3 Path Traversal via Symlink Bypass

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 版本在 3.10.3 之前存在一个路径穿越漏洞。该漏洞出现在语料库读取器（corpus readers）中，这些读取器在使用内置的 函数而非 来重新打开基于根目录派生的路径时，未能进行充分的安全检查，从而导致符号链接能够绕过可信根目录的限制。攻击者若在有信任关系的根目录下布置符号链接指向的语料库文件，便可利用 、 和 等常规语料库读取器方法，泄露根目录之外的敏感内容。

CVSS 5.9 · Medium

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 2

VendorProduct Version RangeStatus
nltk nltk < 3.10.3 affected
3.10.3 unaffected
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I. Basic Information for CVE-2026-79676

Vulnerability Information
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Vulnerability Title
NLTK before 3.10.3 Path Traversal via Symlink Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
NLTK versions before 3.10.3 contain a path traversal vulnerability in corpus readers that reopen root-derived paths using built-in open() instead of nltk.pathsec.open(), allowing symlinks to escape trusted roots. Attackers who stage symlinked corpus files under a trusted data root can disclose outside-root content through normal corpus reader methods like channels(), domains(), and synonyms().
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
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 0 ~ 3.10.3 -

II. Public POCs for CVE-2026-79676

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III. Intelligence Information for CVE-2026-79676

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Vendor Advisories for CVE-2026-79676 (2)

Same Patch Batch · nltk · 2026-08-25 · 8 CVEs total

CVE-2026-79657 9.8 CRITICAL NLTK before 3.10.3 Remote Code Execution via Unsafe Pickle Deserialization
CVE-2026-79675 9.8 CRITICAL NLTK before 3.10.3 JVM Argument Injection via Per-Call Options
CVE-2026-78683 9.6 CRITICAL NLTK before 3.10.0 Remote Code Execution via Unsafe Pickle Deserialization
CVE-2026-79674 8.2 HIGH NLTK 3.10.2 Path Traversal via corpus-reader constructors
CVE-2026-78680 7.8 HIGH NLTK before 3.10.3 Arbitrary Code Execution via Graphviz dot Binary
CVE-2026-78681 7.5 HIGH NLTK before 3.10.3 Entity Expansion DoS via ElementTree
CVE-2026-78682 7.5 HIGH NLTK before 3.10.3 SSRF Protection Bypass via Proxy

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-79676

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