CVE-2026-86349

Mattermost versions 11.9.x = 11.9.0, 11.8.x = 11.8.4, 11.7.x = 11.7.8, 10.11.x = 10.11.22 fail to limit the nesting depth in the server-side Markdown parser which allows an authenticated attacker to cause a denial of service CPU resource exhaustion via a crafted post containing deeply nested...

EUVD-2026-77480

Mattermost versions 11.9.x = 11.9.0, 11.8.x = 11.8.4, 11.7.x = 11.7.8, 10.11.x = 10.11.22 fail to limit the nesting depth in the server-side Markdown parser which allows an authenticated attacker to cause a denial of service CPU resource exhaustion via a crafted post containing deeply nested...

CVE-2026-86349 Mattermost Server Algorithmic DoS via Unbounded Markdown Block Nesting

Mattermost versions 11.9.x = 11.9.0, 11.8.x = 11.8.4, 11.7.x = 11.7.8, 10.11.x = 10.11.22 fail to limit the nesting depth in the server-side Markdown parser which allows an authenticated attacker to cause a denial of service CPU resource exhaustion via a crafted post containing deeply nested...

PT-2026-91239

Mattermost versions 11.9.x = 11.9.0, 11.8.x = 11.8.4, 11.7.x = 11.7.8, 10.11.x = 10.11.22 fail to limit the nesting depth in the server-side Markdown parser which allows an authenticated attacker to cause a denial of service CPU resource exhaustion via a crafted post containing deeply nested...

EUVD-2026-65137

Mistune: Denial of Service — RecursionError via Excessive Emphasis Markers in Markdown...

CVE-2026-48988

A flaw was found in markdown-it, a Markdown parser. A remote attacker could exploit this vulnerability to cause a Denial of Service DoS when the typographer option is enabled. This occurs due to inefficient processing of smartquotes, leading to excessive CPU consumption when parsing specially...

CVE-2026-76098

A flaw was found in Mistune, a Python Markdown parser. This vulnerability allows a remote attacker to trigger a Denial of Service DoS by submitting specially crafted Markdown input. The excessive use of emphasis markers, such as consecutive asterisks, creates deeply nested tokens during HTML...

Linux Distros Unpatched Vulnerability : CVE-2026-76098

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Mistune is a Python Markdown parser with renderers and plugins. Versions 3.3.0 through 3.3.2 are vulnerable to DoS through deeply nested tokens. HTML rendering...

AZL-97956 CVE-2026-76098 affecting package python-mistune for versions less than 3.3.4-1

Mistune is a Python Markdown parser with renderers and plugins. Versions 3.3.0 through 3.3.2 are vulnerable to DoS through deeply nested tokens. HTML rendering creates deeply nested emphasis tokens from consecutive asterisk characters, and recursive rendering in HTMLRenderer.rendertoken can excee...

CVE-2026-76098

Mistune is a Python Markdown parser with renderers and plugins. Versions 3.3.0 through 3.3.2 are vulnerable to DoS through deeply nested tokens. HTML rendering creates deeply nested emphasis tokens from consecutive asterisk characters, and recursive rendering in HTMLRenderer.rendertoken can excee...

UBUNTU-CVE-2026-76098

Mistune is a Python Markdown parser with renderers and plugins. Versions 3.3.0 through 3.3.2 are vulnerable to DoS through deeply nested tokens. HTML rendering creates deeply nested emphasis tokens from consecutive asterisk characters, and recursive rendering in HTMLRenderer.rendertoken can excee...

CVE-2026-76098

Mistune is a Python Markdown parser with renderers and plugins. Versions 3.3.0 through 3.3.2 are vulnerable to DoS through deeply nested tokens. HTML rendering creates deeply nested emphasis tokens from consecutive asterisk characters, and recursive rendering in HTMLRenderer.rendertoken can excee...

CVE-2026-76098

Mistune (Python Markdown parser) versions 3.3.0 through 3.3.2 are vulnerable to Denial of Service via deeply nested emphasis tokens. When HTML rendering processes consecutive asterisk characters, recursive calls in HTMLRenderer.render_token() can exceed Python's recursion limit, raising a Recursi...

CVE-2026-76098 Mistune has Denial of Service — RecursionError via Excessive Emphasis Markers in Markdown

Mistune is a Python Markdown parser with renderers and plugins. Versions 3.3.0 through 3.3.2 are vulnerable to DoS through deeply nested tokens. HTML rendering creates deeply nested emphasis tokens from consecutive asterisk characters, and recursive rendering in HTMLRenderer.rendertoken can excee...

CVE-2026-76098

Mistune is a Python Markdown parser with renderers and plugins. Versions 3.3.0 through 3.3.2 are vulnerable to DoS through deeply nested tokens. HTML rendering creates deeply nested emphasis tokens from consecutive asterisk characters, and recursive rendering in HTMLRenderer.rendertoken can excee...

Astra Linux – Vulnerability in node-marked

Marked is a markdown parser and compiler. Prior to version 4.0.10, the regular expression block.def might cause catastrophic backtracking against certain strings, leading to a regular expression denial of service ReDoS attack. Any user who runs untrusted markdown using a vulnerable version of...

CVE-2026-55839

Kestra is an open-source, event-driven orchestration platform. Prior to 1.3.24, Kestra's custom Markdown parser in ui/src/utils/markdownplugins/link.ts allows a user with permission to create or update a Flow description to inject JavaScript event-handler attributes through the custom link syntax...

CVE-2026-55839 Kestra: Stored XSS via custom Markdown [[link]] attribute injection

Kestra is an open-source, event-driven orchestration platform. Prior to 1.3.24, Kestra's custom Markdown parser in ui/src/utils/markdownplugins/link.ts allows a user with permission to create or update a Flow description to inject JavaScript event-handler attributes through the custom link syntax...

CVE-2026-55839 Kestra: Stored XSS via custom Markdown [[link]] attribute injection

Kestra is an open-source, event-driven orchestration platform. Prior to 1.3.24, Kestra's custom Markdown parser in ui/src/utils/markdownplugins/link.ts allows a user with permission to create or update a Flow description to inject JavaScript event-handler attributes through the custom link syntax...

CVE-2026-55839

Kestra , an open-source event-driven orchestration platform, is vulnerable to stored cross-site scripting (XSS) in versions prior to 1.3.24 . The root cause is in the custom Markdown parser (ui/src/utils/markdown_plugins/link.ts), which renders parsed attributes from the [[link]] syntax directly ...