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openSUSE-SU-2026:20827-1

Опубликовано: 28 мая 2026
Источник: suse-cvrf

Описание

Security update for python-mistune

This update for python-mistune fixes the following issues

  • CVE-2026-33079: ReDoS in LINK_TITLE_RE can lead to denial of service via a crafted Markdown (bsc#1264347).
  • CVE-2026-33441: processing of malformed reference links can lead to excessive resource consumption and denial of service (bsc#1264752).
  • CVE-2026-44708: improper HTML escaping in the math plugin can lead to XSS (bsc#1264751).
  • CVE-2026-44896: improper escaping in render_figure can lead to attribute injection and XSS (bsc#1264754).
  • CVE-2026-44897: improper sanitization of user-controlled input in HTMLRenderer.heading can lead to XSS (bsc#1264750).
  • CVE-2026-44898: improper sanitization of user-supplied HTML input in render_toc_ul can lead to XSS (bsc#1265052).
  • CVE-2026-44899: improper input verification in Image directive plugin and improper escaping in render_block_image can lead to CSS injection (bsc#1265053).

Список пакетов

openSUSE Leap 16.0
python313-mistune-3.1.3-160000.3.1

Ссылки

Описание

In versions 3.0.0a1 through 3.2.0 of Mistune, there is a ReDoS (Regular Expression Denial of Service) vulnerability in `LINK_TITLE_RE` that allows an attacker who can supply Markdown for parsing to cause denial of service. The regular expression used for parsing link titles contains overlapping alternatives that can trigger catastrophic backtracking. In both the double-quoted and single-quoted branches, a backslash followed by punctuation can be matched either as an escaped punctuation sequence or as two ordinary characters, creating an ambiguous pattern inside a repeated group. If an attacker supplies Markdown containing repeated ! sequences with no closing quote, the regex engine explores an exponential number of backtracking paths. This is reachable through normal Markdown parsing of inline links and block link reference definitions. A small crafted input can therefore cause significant CPU consumption and make applications using Mistune unresponsive.

Затронутые продукты
openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1
Ссылки

Описание

This CVE is a duplicate of another CVE: CVE-2026-33079.

Затронутые продукты
openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1
Ссылки

Описание

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, the mistune math plugin renders inline math ($...$) and block math ($$...$$) by concatenating the raw user-supplied content directly into the HTML output without any HTML escaping. This occurs even when the parser is explicitly created with escape=True, which is supposed to guarantee that all user-controlled text is sanitised before reaching the DOM. This vulnerability is fixed in 3.2.1.

Затронутые продукты
openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1
Ссылки

Описание

Mistune is a Python Markdown parser with renderers and plugins. In 3.2.0 and realier, in src/mistune/directives/image.py, the render_figure() function concatenates figclass and figwidth options directly into HTML attributes without escaping. This allows attribute injection and XSS even when HTMLRenderer(escape=True) is used, because these values bypass the inline renderer.

Затронутые продукты
openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1
Ссылки

Описание

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, HTMLRenderer.heading() builds the opening <hN> tag by string-concatenating the id attribute value directly into the HTML - with no call to escape(), safe_entity(), or any other sanitisation function. A double-quote character " in the id value terminates the attribute, allowing an attacker to inject arbitrary additional attributes (event handlers, src=, href=, etc.) into the heading element. This vulnerability is fixed in 3.2.1.

Затронутые продукты
openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1
Ссылки

Описание

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, render_toc_ul() builds a <ul> table-of-contents tree from a list of (level, id, text) tuples. Both the id value (used as href="#<id>") and the text value (used as the visible link label) are inserted into <a> tags via a plain Python format string - with no HTML escaping applied to either value. When heading IDs are derived from user-supplied heading text (the standard use-case for readable slug anchors), an attacker can craft a heading whose text breaks out of the href="#..." attribute context, injecting arbitrary HTML tags including <script> blocks directly into the rendered TOC. This vulnerability is fixed in 3.2.1.

Затронутые продукты
openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1
Ссылки

Описание

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, the Image directive plugin validates the :width: and :height: options with a regex compiled as _num_re = re.compile(r"^\d+(?:\.\d*)?"). When the validated value is not a plain integer, render_block_image() inserts it directly into a style="width:...;" or style="height:...;" attribute. Because the value was accepted by the prefix-only regex, any CSS after the leading digits reaches the style= attribute verbatim and without escaping. This vulnerability is fixed in 3.2.1.

Затронутые продукты
openSUSE Leap 16.0:python313-mistune-3.1.3-160000.3.1
Ссылки