CVE-2019-25781

Опубликовано: 29 окт. 2026

Источник: redhat

CVSS3: 7.5

EPSS Низкий

Описание

Python-Markdown 3.0 through 3.11.2 contains an algorithmic complexity vulnerability in inline link parsing that allows remote attackers to exhaust CPU through unmatched brackets. Attackers can submit short Markdown containing repeated [ or ![ characters, forcing LinkInlineProcessor.getText() and getLink() into quadratic scans that keep workers busy for minutes.

A flaw was found in Python-Markdown. An algorithmic complexity vulnerability in inline link parsing allows a remote attacker to cause a Denial of Service (DoS) by exhausting CPU resources. By submitting specially crafted Markdown text containing repeated unmatched brackets, an attacker can force the parser into inefficient scanning loops that consume excessive CPU time and stall worker processes.

Отчет

This vulnerability is rated as Important because an unauthenticated remote attacker can cause severe service degradation and worker thread exhaustion by submitting minimal payloads with unmatched bracket syntax. Across Red Hat environments, the python-markdown library is integrated into various backend platforms, including Red Hat Ansible Automation Platform, Red Hat Satellite, and OpenShift AI, where it processes formatted text and template data. Systems that expose Markdown rendering endpoints directly to untrusted network traffic are at high risk of denial of service. The impact is substantially lower in deployments where rendering is restricted to verified administrators or internal sources.

Затронутые пакеты

Платформа	Пакет	Состояние
Red Hat AI Inference Server	rhaii-fast/vllm-cpu-rhel9	Affected
Red Hat AI Inference Server	rhaii-fast/vllm-cuda-rhel9	Affected
Red Hat AI Inference Server	rhaii-fast/vllm-gaudi-rhel9	Affected
Red Hat AI Inference Server	rhaii/vllm-cpu-rhel9	Affected
Red Hat AI Inference Server	rhaii/vllm-cuda-rhel9	Affected
Red Hat AI Inference Server	rhaii/vllm-gaudi-rhel9	Affected
Red Hat Ansible Automation Platform 2	ansible-automation-platform-24/controller-rhel8	Fix deferred
Red Hat Ansible Automation Platform 2	ansible-automation-platform-25/controller-rhel8	Fix deferred
Red Hat Ansible Automation Platform 2	ansible-automation-platform-26/controller-rhel9	Affected
Red Hat Ansible Automation Platform 2	ansible-automation-platform-26/hub-rhel9	Affected

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Ссылки на источники

Дополнительная информация

Статус:

Important

Дефект:

CWE-606

https://bugzilla.redhat.com/show_bug.cgi?id=2563374markdown: python-markdown: Denial of Service via inefficient inline link parsing

EPSS

Процентиль: 37%

0.00422

Низкий

7.5 High

CVSS3

Связанные уязвимости

CVE-2019-25781

CVSS3: 7.5

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15 дней назад

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15 дней назад

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CVSS3: 7.5

msrc

11 дней назад

Python-Markdown 3.0 through 3.11.2 Denial of Service via Link Bracket Parsing

CVE-2019-25781

CVSS3: 7.5

debian

15 дней назад

Python-Markdown 3.0 through 3.11.2 contains an algorithmic complexity ...

GHSA-4g9h-pv2v-fw83

CVSS3: 7.5

github

15 дней назад

EPSS

Процентиль: 37%

0.00422

Низкий

7.5 High

CVSS3