CVE-2026-59922Disclosure(mistune_project / mistune)

LOWCVSS 7.5 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a run of closed tilde, equals-sign, or caret marker pairs around a character causes quadratic work in src/mistune/plugins/formatting.py when the strikethrough, mark, or insert plugin scans for matching markers from each possible start position, allowing denial of service through CPU exhaustion. This issue is fixed in version 3.3.0.

mistune_project CVEs Back to dashboard

0.0/ 10 priority

Sources & remediation

Patch / fix

https://github.com/lepture/mistune/commit/96d0f57f8fe9eeb06bb4cff521962a27d7c402e7

Exploit / PoC references

Other references

https://github.com/lepture/mistune/releases/tag/v3.3.0

Weakness type (CWE)

CWE-407CWE-1333

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

mistune

Threat summary

1 mentions across 1 observed day

What's happening

Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Affected systems

Vendors

mistune_project

Products

mistune

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Referenced assets1 URL

By indicator

https://dailycve.com/mistune-python-markdown-parser-algorithmic-complexity-denial-of-service-cve-2026-59922-high-dc-jul2026-1109/

Full discourse1 post

DailyCVE@dailycve91d
Disclosure
🔴 Mistune (#Python Markdown Parser) Algorithmic Complexity Denial of Service, #CVE-2026-59922 (High) -DC-Jul2026-1109 https://dailycve.com/mistune-python-markdown-parser-algorithmic-complexity-denial-of-service-cve-2026-59922-high-dc-jul2026-1109/
Post summary
The tweet announces a new high‑severity Denial of Service vulnerability (CVE‑2026‑59922) in the Mistune Python Markdown parser, with no proof of concept, exploit code, or patch details provided.
0000039
220 followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	mistune_project	mistune	-	-	-

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