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CVE-2026-78680— NLTK before 3.10.3 Arbitrary Code Execution via Graphviz dot Binary

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.

在 NLTK 版本早于 3.10.3 中，当通过 和 调用 Graphviz 的 二进制文件时，未使用经过验证的绝对路径，从而导致攻击者可以通过将恶意的 二进制文件放置于系统搜索路径或当前工作目录中，执行任意代码。攻击者可利用 Windows 上的当前工作目录解析机制，或 Unix 类系统中相对路径的 PATH 条目解析机制，触发对裸名称（bare-name）二进制文件的解析，从而执行其恶意二进制文件而非合法的 Graphviz 工具。

CVSS 7.8 · High EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

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-2026-78680

Vulnerability Information
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Vulnerability Title
NLTK before 3.10.3 Arbitrary Code Execution via Graphviz dot Binary
Source: CVE Program / CVE List V5
Vulnerability Description
NLTK versions before 3.10.3 fail to use validated absolute paths when invoking the Graphviz dot binary in dependencygraph.dot2img and AlignedSent._repr_svg_, allowing attackers to execute arbitrary code by placing a malicious dot binary in the search path or current working directory. Attackers can exploit bare-name binary resolution on Windows via the current working directory or on Unix-like systems via relative PATH entries to execute their binary instead of the legitimate Graphviz tool.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可信的搜索路径
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-2026-78680

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8775 chars
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III. Intelligence Information for CVE-2026-78680

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Vendor Advisories for CVE-2026-78680 (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-2026-78681 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
CVE-2026-79676 5.9 MEDIUM NLTK before 3.10.3 Path Traversal via Symlink Bypass

IV. Related Vulnerabilities

Same product: nltk
Same vendor: nltk
Same weakness: CWE-426

V. Comments for CVE-2026-78680

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