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CVE-2025-66400

mdast-util-to-hast is an mdast utility to transform to hast. From 13.0.0 to before 13.2.1, multiple (unprefixed) classnames could be added in markdown source by using character references. This could make rendered user supplied markdown code elements appear like the rest of the page. This vulnerability is fixed in 13.2.1.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:0db744cba4752def2940ede9355d3f27d25e8e26f4f3432c2db39a18a366f453
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-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5e014dea53b6c690c98f43c8363d7c3e32678ffce90ea903233e24b6fb13da73 · sha256:a47b837899d698b4… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-915","description":"CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5e014dea53b6c690c98f43c8363d7c3e32678ffce90ea903233e24b6fb13da73 · sha256:a47b837899d698b4… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"mdast-util-to-hast","vendor":"syntax-tree","versions":[{"status":"affected","version":">= 13.0.0, < 13.2.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:5e014dea53b6c690c98f43c8363d7c3e32678ffce90ea903233e24b6fb13da73 · sha256:a47b837899d698b4… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":6.9,"baseSeverity":"MEDIUM","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:5e014dea53b6c690c98f43c8363d7c3e32678ffce90ea903233e24b6fb13da73 · sha256:a47b837899d698b4… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-20","description":"CWE-20: Improper Input Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5e014dea53b6c690c98f43c8363d7c3e32678ffce90ea903233e24b6fb13da73 · sha256:a47b837899d698b4… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-915","description":"CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:5e014dea53b6c690c98f43c8363d7c3e32678ffce90ea903233e24b6fb13da73 · sha256:a47b837899d698b4… · /containers/cna/problemTypes/1/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/syntax-tree/mdast-util-to-hast/commit/6fc783ae6abdeb798fd5a68e7f3f21411dde7403","tags":["x_refsource_MISC"],"url":"https://github.com/syntax-tree/mdast-util-to-hast/commit/6fc783ae6abdeb798fd5a68e7f3f21411dde7403"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5e014dea53b6c690c98f43c8363d7c3e32678ffce90ea903233e24b6fb13da73 · sha256:a47b837899d698b4… · /containers/cna/references/1
{"name":"https://github.com/syntax-tree/mdast-util-to-hast/commit/ab3a79570a1afbfa7efef5d4a0cd9b5caafbc5d7","tags":["x_refsource_MISC"],"url":"https://github.com/syntax-tree/mdast-util-to-hast/commit/ab3a79570a1afbfa7efef5d4a0cd9b5caafbc5d7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5e014dea53b6c690c98f43c8363d7c3e32678ffce90ea903233e24b6fb13da73 · sha256:a47b837899d698b4… · /containers/cna/references/2
{"name":"https://github.com/syntax-tree/mdast-util-to-hast/security/advisories/GHSA-4fh9-h7wg-q85m","tags":["x_refsource_CONFIRM"],"url":"https://github.com/syntax-tree/mdast-util-to-hast/security/advisories/GHSA-4fh9-h7wg-q85m"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:5e014dea53b6c690c98f43c8363d7c3e32678ffce90ea903233e24b6fb13da73 · sha256:a47b837899d698b4… · /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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