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CVE-2026-59927

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the Include directive in src/mistune/directives/include.py detects only direct self-includes and not indirect cycles, allowing two markdown files that include each other to trigger unbounded recursion, raise RecursionError, and crash the rendering request. This issue is fixed in version 3.3.0.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:4263f828c19e77e87ee9a92f6ee49c47ba3563993bd93eb04046a49f379c5ca9
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-674","description":"CWE-674: Uncontrolled Recursion","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2dea4e550302d69ebce53454ab7b74c0bdd09381bf9729252e0e655784477e88 · sha256:a1f51774a73c2bd4… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-755","description":"CWE-755: Improper Handling of Exceptional Conditions","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2dea4e550302d69ebce53454ab7b74c0bdd09381bf9729252e0e655784477e88 · sha256:a1f51774a73c2bd4… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"mistune","vendor":"lepture","versions":[{"status":"affected","version":"< 3.3.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2dea4e550302d69ebce53454ab7b74c0bdd09381bf9729252e0e655784477e88 · sha256:a1f51774a73c2bd4… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:2dea4e550302d69ebce53454ab7b74c0bdd09381bf9729252e0e655784477e88 · sha256:a1f51774a73c2bd4… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-674","description":"CWE-674: Uncontrolled Recursion","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2dea4e550302d69ebce53454ab7b74c0bdd09381bf9729252e0e655784477e88 · sha256:a1f51774a73c2bd4… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-755","description":"CWE-755: Improper Handling of Exceptional Conditions","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2dea4e550302d69ebce53454ab7b74c0bdd09381bf9729252e0e655784477e88 · sha256:a1f51774a73c2bd4… · /containers/cna/problemTypes/1/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/lepture/mistune/commit/1bef343ade163fc3bb95572b15be720084cdb993","tags":["x_refsource_MISC"],"url":"https://github.com/lepture/mistune/commit/1bef343ade163fc3bb95572b15be720084cdb993"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2dea4e550302d69ebce53454ab7b74c0bdd09381bf9729252e0e655784477e88 · sha256:a1f51774a73c2bd4… · /containers/cna/references/1
{"name":"https://github.com/lepture/mistune/releases/tag/v3.3.0","tags":["x_refsource_MISC"],"url":"https://github.com/lepture/mistune/releases/tag/v3.3.0"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2dea4e550302d69ebce53454ab7b74c0bdd09381bf9729252e0e655784477e88 · sha256:a1f51774a73c2bd4… · /containers/cna/references/2
{"name":"https://github.com/lepture/mistune/security/advisories/GHSA-8mpj-m6qm-5qr8","tags":["x_refsource_CONFIRM"],"url":"https://github.com/lepture/mistune/security/advisories/GHSA-8mpj-m6qm-5qr8"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2dea4e550302d69ebce53454ab7b74c0bdd09381bf9729252e0e655784477e88 · sha256:a1f51774a73c2bd4… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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