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CVE-2026-44897

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, HTMLRenderer.heading() builds the opening <hN> tag by string-concatenating the id attribute value directly into the HTML — with no call to escape(), safe_entity(), or any other sanitisation function. A double-quote character " in the id value terminates the attribute, allowing an attacker to inject arbitrary additional attributes (event handlers, src=, href=, etc.) into the heading element. This vulnerability is fixe
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:01c132fd3adfc3246d7c2518383ecc11de73a39f4256e934560e2b6508143105
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":"< 3.2.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3c07e176885005fd396514a889fd8bbe091c23c29f5aa42f42e0453ae9d84b8d · sha256:e7c5b5e615c68e5a… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.1,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:3c07e176885005fd396514a889fd8bbe091c23c29f5aa42f42e0453ae9d84b8d · sha256:e7c5b5e615c68e5a… · /containers/cna/metrics/0/cvssV3_1

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:v2:3c07e176885005fd396514a889fd8bbe091c23c29f5aa42f42e0453ae9d84b8d · sha256:e7c5b5e615c68e5a… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"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:v2:3c07e176885005fd396514a889fd8bbe091c23c29f5aa42f42e0453ae9d84b8d · sha256:e7c5b5e615c68e5a… · /containers/cna/references/1
{"name":"https://github.com/lepture/mistune/security/advisories/GHSA-v87v-83h2-53w7","tags":["x_refsource_CONFIRM"],"url":"https://github.com/lepture/mistune/security/advisories/GHSA-v87v-83h2-53w7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c07e176885005fd396514a889fd8bbe091c23c29f5aa42f42e0453ae9d84b8d · sha256:e7c5b5e615c68e5a… · /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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