{"id":"GHSA-5r3x-p7xx-x6q5","summary":"Comrak AST node data is not validated (GHSL-2023-049)","details":"### Impact\nA Comrak AST can be constructed manually by a program instead of parsing a Markdown document with `parse_document`. This AST can then be converted to HTML via `html::format_document_with_plugins`. However, the HTML formatting code assumes that the AST is well-formed. For example, many AST notes contain `[u8]` fields which the formatting code assumes is valid UTF-8 data. Several bugs can be triggered if this is not the case.\n\n### Patches\n\n0.17.0 contains adjustments to the AST, storing strings instead of unvalidated byte arrays.\n\n### Workarounds\n\n* Validate UTF-8 correctness of all data when assigning to `&[u8]` and `Vec\u003cu8\u003e` fields in the AST.\n\n### References\nn/a","aliases":["CVE-2023-28631"],"modified":"2026-09-10T03:49:52.639385252Z","published":"2023-03-28T14:45:28Z","database_specific":{"severity":"MODERATE","github_reviewed":true,"github_reviewed_at":"2023-03-28T14:45:28Z","nvd_published_at":"2023-03-28T21:15:00Z","cwe_ids":["CWE-755"]},"references":[{"type":"WEB","url":"https://github.com/kivikakk/comrak/security/advisories/GHSA-5r3x-p7xx-x6q5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-28631"},{"type":"WEB","url":"https://github.com/kivikakk/comrak/commit/9ff5f8df0ac951f5742d22a72c39b89a15f56639"},{"type":"PACKAGE","url":"https://github.com/kivikakk/comrak"},{"type":"WEB","url":"https://github.com/kivikakk/comrak/releases/tag/0.17.0"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OUYME2VA555X6567H7ORIJQFN4BVGT6N"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PTWZWCT7KCX2KTXTLPUYZ3EHOONG4X46"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VQ3UBC7LE4VPCMZBTADIBL353CH7CPVV"}],"affected":[{"package":{"name":"comrak","ecosystem":"crates.io","purl":"pkg:cargo/comrak"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.17.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/03/GHSA-5r3x-p7xx-x6q5/GHSA-5r3x-p7xx-x6q5.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}