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CVE-2026-40890

The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Processing a malformed input containing a < character that is not followed by a > character anywhere in the remaining text with a SmartypantsRenderer will lead to Out of Bounds read or a panic. This vulnerability is fixed with commit 759bbc3e32073c3bc4e25969c132fc520eda2778.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:443c436b6cf19b304186503b3053de5c01c58cd31f4a196fd7035b62caaa4563
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"markdown","vendor":"gomarkdown","versions":[{"status":"affected","version":"< 759bbc3e32073c3bc4e25969c132fc520eda2778"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:bc5f79669e82c4e46ce573156d1f7484faa2a528e948811585cea9c72637ed1d · sha256:549eae2cfc9c2ec9… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","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:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:bc5f79669e82c4e46ce573156d1f7484faa2a528e948811585cea9c72637ed1d · sha256:549eae2cfc9c2ec9… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-125","description":"CWE-125: Out-of-bounds Read","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:bc5f79669e82c4e46ce573156d1f7484faa2a528e948811585cea9c72637ed1d · sha256:549eae2cfc9c2ec9… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/gomarkdown/markdown/commit/759bbc3e32073c3bc4e25969c132fc520eda2778","tags":["x_refsource_MISC"],"url":"https://github.com/gomarkdown/markdown/commit/759bbc3e32073c3bc4e25969c132fc520eda2778"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bc5f79669e82c4e46ce573156d1f7484faa2a528e948811585cea9c72637ed1d · sha256:549eae2cfc9c2ec9… · /containers/cna/references/1
{"name":"https://github.com/gomarkdown/markdown/security/advisories/GHSA-77fj-vx54-gvh7","tags":["x_refsource_CONFIRM"],"url":"https://github.com/gomarkdown/markdown/security/advisories/GHSA-77fj-vx54-gvh7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bc5f79669e82c4e46ce573156d1f7484faa2a528e948811585cea9c72637ed1d · sha256:549eae2cfc9c2ec9… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/gomarkdown/markdown/security/advisories/GHSA-77fj-vx54-gvh7"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:bc5f79669e82c4e46ce573156d1f7484faa2a528e948811585cea9c72637ed1d · sha256:549eae2cfc9c2ec9… · /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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