CVE Explorer

CVE-2026-59926

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, render_admonition() in src/mistune/directives/admonition.py concatenates the Admonition directive :class: option into the HTML class attribute without escaping, allowing attribute injection and cross-site scripting even when HTMLRenderer escape mode is enabled. This issue is fixed in version 3.2.1.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:411286bb5d3d8b76f2959ad56bbacdbce3055d85a61df8162960c9f273935c6e

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"mistune","vendor":"lepture","versions":[{"status":"affected","version":"< 3.2.1"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:16253726d2866d6f5647882bc65d501acf5003fc5c39ab9fa9da24a22b740a39 · sha256:000f78eda885f684… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.3,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"PASSIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:16253726d2866d6f5647882bc65d501acf5003fc5c39ab9fa9da24a22b740a39 · sha256:000f78eda885f684… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion

{"cweId":"CWE-79","description":"CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:16253726d2866d6f5647882bc65d501acf5003fc5c39ab9fa9da24a22b740a39 · sha256:000f78eda885f684… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions

{"name":"https://github.com/lepture/mistune/commit/a3cb6e5655308797e8be021d6c7b5bab13cbace2","tags":["x_refsource_MISC"],"url":"https://github.com/lepture/mistune/commit/a3cb6e5655308797e8be021d6c7b5bab13cbace2"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:16253726d2866d6f5647882bc65d501acf5003fc5c39ab9fa9da24a22b740a39 · sha256:000f78eda885f684… · /containers/cna/references/1

{"name":"https://github.com/lepture/mistune/releases/tag/v3.2.1","tags":["x_refsource_MISC"],"url":"https://github.com/lepture/mistune/releases/tag/v3.2.1"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:16253726d2866d6f5647882bc65d501acf5003fc5c39ab9fa9da24a22b740a39 · sha256:000f78eda885f684… · /containers/cna/references/2

{"name":"https://github.com/lepture/mistune/security/advisories/GHSA-g97x-gvcm-x72h","tags":["x_refsource_CONFIRM"],"url":"https://github.com/lepture/mistune/security/advisories/GHSA-g97x-gvcm-x72h"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:16253726d2866d6f5647882bc65d501acf5003fc5c39ab9fa9da24a22b740a39 · sha256:000f78eda885f684… · /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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