There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - NLTK (Natural Language Toolkit) is a suite of open source Python modules, data sets, and tutorials
    supporting research and development in Natural Language Processing. Versions prior to 3.6.5 are vulnerable
    to regular expression denial of service (ReDoS) attacks. The vulnerability is present in
    PunktSentenceTokenizer, sent_tokenize and word_tokenize. Any users of this class, or these two functions,
    are vulnerable to the ReDoS attack. In short, a specifically crafted long input to any of these vulnerable
    functions will cause them to take a significant amount of execution time. If your program relies on any of
    the vulnerable functions for tokenizing unpredictable user input, then we would strongly recommend
    upgrading to a version of NLTK without the vulnerability. For users unable to upgrade the execution time
    can be bounded by limiting the maximum length of an input to any of the vulnerable functions. Our
    recommendation is to implement such a limit. (CVE-2021-43854)

远程 Ubuntu 14.04 LTS/16.04 LTS/18.04 LTS/20.04 LTS 主机上安装的多个程序包受到 USN-7365-1 公告中提及的多个漏洞影响。

    据发现，NLTK 包含易受灾难性回溯影响的正则表达式。攻击者可能利用此问题造成拒绝服务。（CVE-2021-3842、CVE-2021-43854）

Tenable 已直接从 Ubuntu 安全公告中提取上述描述块。

请注意，Nessus 尚未测试这些问题，而是只依据应用程序自我报告的版本号进行判断。

遠端 Ubuntu 14.04 LTS/16.04 LTS/18.04 LTS/20.04 LTS 主機上安裝的多個套件受到 USN-7365-1 公告中提及的多個弱點影響。

    據發現，NLTK 包含容易發生災難性回溯的 regex。攻擊者可能利用此問題造成拒絕服務。(CVE-2021-3842、CVE-2021-43854)

Tenable 已直接從 Ubuntu 安全公告擷取前置描述區塊。

請注意，Nessus 並未測試這些問題，而是僅依據應用程式自我報告的版本號碼作出判斷。

リモートの Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS ホストには、USN-7365-1 のアドバイザリに記載された複数の脆弱性の影響を受けるパッケージがインストールされています。

    NLTK に、壊滅的なバックトラッキングの影響を受けやすい正規表現が含まれていることがわかりました。攻撃者がこの問題を悪用して、サービス拒否を引き起こす可能性があります。(CVE-2021-3842、CVE-2021-43854)

Tenable は、前述の説明ブロックを Ubuntu セキュリティアドバイザリからすでに直接抽出しています。

Nessus はこれらの問題をテストしておらず、代わりにアプリケーションが自己報告するバージョン番号にのみ依存していることに注意してください。

The remote Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-7365-1 advisory.

    It was discovered that NLTK contained a regex that is susceptible to catastrophic backtracking. An     attacker could possibly use this issue to cause a denial of service. (CVE-2021-3842, CVE-2021-43854)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
431710	SCA: security update for nltk (GHSA-f8m6-h2c7-8h9x)	Tenable Cloud Security	SCA Checks	2025/8/7	2026/7/2	high
431710	SCA: security update for nltk (GHSA-f8m6-h2c7-8h9x)	Tenable Self-Hosted Container Security	SCA Checks	2025/8/7	2026/7/2	high
233286	Ubuntu 14.04 LTS/16.04 LTS/18.04 LTS/20.04 LTS：NLTK 漏洞 (USN-7365-1)	Nessus	Ubuntu Local Security Checks	2025/3/24	2025/3/24	high
233286	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS：NLTK 弱點 (USN-7365-1)	Nessus	Ubuntu Local Security Checks	2025/3/24	2025/3/24	high
233286	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS : NLTK の脆弱性 (USN-7365-1)	Nessus	Ubuntu Local Security Checks	2025/3/24	2025/3/24	high
233286	Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 20.04 LTS : NLTK vulnerabilities (USN-7365-1)	Nessus	Ubuntu Local Security Checks	2025/3/24	2025/3/24	high

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