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CVE-2026-59924

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, Include.parse() joins and normalizes user-supplied include paths without verifying that the result remains within the intended markdown directory, allowing crafted include paths to access files outside that directory when markdown files are processed using md.read(). This issue is fixed in version 3.3.0.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:1d1423cd65e376dca89d07bd80779d8bde0f09f4b2972ac13260dde8fd4d6334
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
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:a5036625e5435c2587f385cba1cecb65afc795a9fc78c1a15706b7c9fefca41e · sha256:bad580dddce52c91… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a5036625e5435c2587f385cba1cecb65afc795a9fc78c1a15706b7c9fefca41e · sha256:bad580dddce52c91… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-22","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a5036625e5435c2587f385cba1cecb65afc795a9fc78c1a15706b7c9fefca41e · sha256:bad580dddce52c91… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 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:a5036625e5435c2587f385cba1cecb65afc795a9fc78c1a15706b7c9fefca41e · sha256:bad580dddce52c91… · /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:a5036625e5435c2587f385cba1cecb65afc795a9fc78c1a15706b7c9fefca41e · sha256:bad580dddce52c91… · /containers/cna/references/2
{"name":"https://github.com/lepture/mistune/security/advisories/GHSA-r4rv-85jg-w4mf","tags":["x_refsource_CONFIRM"],"url":"https://github.com/lepture/mistune/security/advisories/GHSA-r4rv-85jg-w4mf"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a5036625e5435c2587f385cba1cecb65afc795a9fc78c1a15706b7c9fefca41e · sha256:bad580dddce52c91… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/lepture/mistune/security/advisories/GHSA-r4rv-85jg-w4mf"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a5036625e5435c2587f385cba1cecb65afc795a9fc78c1a15706b7c9fefca41e · sha256:bad580dddce52c91… · /containers/adp/0/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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