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CVE-2026-12259

Опубликовано: 03 авг. 2026
Источник: redhat
CVSS3: 5.3
EPSS Низкий

Описание

In nltk version 3.9.4, the nltk.downloader.Downloader._download_package() function writes downloaded package bytes to disk and may extract them before enforcing SHA-256 or MD5 checksum validation. This allows an attacker to tamper with the package response body for info.url through a compromised mirror, malicious proxy, or other source-substitution condition, leading to the installation of attacker-controlled package bytes. The vulnerability can result in malicious corpus or model content being trusted by downstream users or applications.

A flaw was found in nltk. The nltk.downloader.Downloader._download_package() function does not enforce SHA-256 or MD5 checksum validation before writing and extracting downloaded package bytes to disk. A remote attacker can exploit this by tampering with the package response body through a compromised mirror, malicious proxy, or other source-substitution condition. This can lead to the installation of attacker-controlled package bytes, resulting in malicious content being trusted by downstream users or applications.

Затронутые пакеты

ПлатформаПакетСостояниеРекомендацияРелиз
Exploit Intelligenceexploit-intelligence-tech-preview/vulnerability-analysis-rhel9Out of support scope
Lightspeed Corelightspeed-core/lightspeed-stack-rhel9Fix deferred
Lightspeed Corelightspeed-core/rag-tool-cpu-rhel9Fix deferred
Lightspeed Corelightspeed-core/rag-tool-cuda-12.9-rhel9Fix deferred
OpenShift Lightspeedopenshift-lightspeed/lightspeed-ocp-rag-rhel9Fix deferred
OpenShift Lightspeedopenshift-lightspeed/lightspeed-service-api-rhel9Fix deferred
OpenShift Lightspeedopenshift-lightspeed-tech-preview/lightspeed-rag-tool-rhel9Fix deferred
Red Hat Ansible Automation Platform 2ansible-automation-platform-25/lightspeed-chatbot-rhel8Out of support scope
Red Hat OpenShift AI (RHOAI)rhoai/odh-llama-stack-core-rhel9Fix deferred
Red Hat OpenShift AI (RHOAI)rhoai/odh-pipeline-runtime-pytorch-llmcompressor-cuda-py312-rhel9Fix deferred

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Дополнительная информация

Статус:

Moderate
Дефект:
CWE-354
https://bugzilla.redhat.com/show_bug.cgi?id=2510340nltk: nltk: Installation of attacker-controlled packages due to improper checksum validation

EPSS

Процентиль: 1%
0.001
Низкий

5.3 Medium

CVSS3

Связанные уязвимости

CVSS3: 5.3
ubuntu
16 дней назад

In nltk version 3.9.4, the `nltk.downloader.Downloader._download_package()` function writes downloaded package bytes to disk and may extract them before enforcing SHA-256 or MD5 checksum validation. This allows an attacker to tamper with the package response body for `info.url` through a compromised mirror, malicious proxy, or other source-substitution condition, leading to the installation of attacker-controlled package bytes. The vulnerability can result in malicious corpus or model content being trusted by downstream users or applications.

CVSS3: 5.3
nvd
16 дней назад

In nltk version 3.9.4, the `nltk.downloader.Downloader._download_package()` function writes downloaded package bytes to disk and may extract them before enforcing SHA-256 or MD5 checksum validation. This allows an attacker to tamper with the package response body for `info.url` through a compromised mirror, malicious proxy, or other source-substitution condition, leading to the installation of attacker-controlled package bytes. The vulnerability can result in malicious corpus or model content being trusted by downstream users or applications.

CVSS3: 5.3
debian
16 дней назад

In nltk version 3.9.4, the `nltk.downloader.Downloader._download_packa ...

CVSS3: 5.3
github
16 дней назад

In nltk version 3.9.4, the `nltk.downloader.Downloader._download_package()` function writes downloaded package bytes to disk and may extract them before enforcing SHA-256 or MD5 checksum validation. This allows an attacker to tamper with the package response body for `info.url` through a compromised mirror, malicious proxy, or other source-substitution condition, leading to the installation of attacker-controlled package bytes. The vulnerability can result in malicious corpus or model content being trusted by downstream users or applications.

EPSS

Процентиль: 1%
0.001
Низкий

5.3 Medium

CVSS3

Уязвимость CVE-2026-12259