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CVE-2026-102941 (GCVE-0-2026-102941)

Vulnerability from nvd – Published: 2026-10-16 15:38 – Updated: 2026-10-16 15:38

Title

gomarkdown/markdown IsSafeURL panics on short URLs

Summary

The package github.com/gomarkdown/markdown is a Go library for parsing Markdown text and rendering as HTML. Prior to 0.0.0-20260724235538-61af6e1e6971, parser.IsSafeURL in parser/parser.go slices url[:nPath] before the len(url) >= nPath guard. A short destination causes a slice-bounds panic when the loop reaches a relative-path prefix for which len(url) < nPath and cap(url) < nPath. The one-byte destination / is an explicit non-panic counterexample because it matches the first valid path and returns before a longer prefix is sliced. Demonstrated panic cases include empty, ., and .. destinations under those conditions. The panic is reachable when markdown.ToHTML renders untrusted Markdown with html.Safelink enabled, including an empty link destination, and is also reachable by callers that pass a short attacker-controlled URL directly to the exported parser.IsSafeURL function. An uncaught panic can terminate the calling process and cause denial of service. This issue is fixed in 0.0.0-20260724235538-61af6e1e6971.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7771 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/gomarkdown/markdown/security/a…	x_refsource_CONFIRM
https://github.com/gomarkdown/markdown/commit/61a…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
gomarkdown	markdown	Affected: < 0.0.0-20260724235538-61af6e1e6971

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "markdown",
          "vendor": "gomarkdown",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.0.0-20260724235538-61af6e1e6971"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The package github.com/gomarkdown/markdown is a Go library for parsing Markdown text and rendering as HTML. Prior to 0.0.0-20260724235538-61af6e1e6971, parser.IsSafeURL in parser/parser.go slices url[:nPath] before the len(url) \u003e= nPath guard. A short destination causes a slice-bounds panic when the loop reaches a relative-path prefix for which len(url) \u003c nPath and cap(url) \u003c nPath. The one-byte destination / is an explicit non-panic counterexample because it matches the first valid path and returns before a longer prefix is sliced. Demonstrated panic cases include empty, ., and .. destinations under those conditions. The panic is reachable when markdown.ToHTML renders untrusted Markdown with html.Safelink enabled, including an empty link destination, and is also reachable by callers that pass a short attacker-controlled URL directly to the exported parser.IsSafeURL function. An uncaught panic can terminate the calling process and cause denial of service. This issue is fixed in 0.0.0-20260724235538-61af6e1e6971."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125: Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-16T15:38:18.086Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/gomarkdown/markdown/security/advisories/GHSA-cv23-7vc5-jfh7",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/gomarkdown/markdown/security/advisories/GHSA-cv23-7vc5-jfh7"
        },
        {
          "name": "https://github.com/gomarkdown/markdown/commit/61af6e1e69710c5ca13cfbaaaa1bc11bc763a8a9",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/gomarkdown/markdown/commit/61af6e1e69710c5ca13cfbaaaa1bc11bc763a8a9"
        }
      ],
      "source": {
        "advisory": "GHSA-cv23-7vc5-jfh7",
        "discovery": "UNKNOWN"
      },
      "title": "gomarkdown/markdown IsSafeURL panics on short URLs"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-102941",
    "datePublished": "2026-10-16T15:38:18.086Z",
    "dateReserved": "2026-09-29T20:24:43.341Z",
    "dateUpdated": "2026-10-16T15:38:18.086Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-40890 (GCVE-0-2026-40890)

Vulnerability from nvd – Published: 2026-04-21 19:51 – Updated: 2026-04-21 20:36

Title

github.com/gomarkdown/markdown: Out-of-bounds Read in SmartypantsRenderer

Summary

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.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-21 20:16 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7771 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/gomarkdown/markdown/security/a…	x_refsource_CONFIRM
https://github.com/gomarkdown/markdown/commit/759…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
gomarkdown	markdown	Affected: < 759bbc3e32073c3bc4e25969c132fc520eda2778

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
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              "content": {
                "id": "CVE-2026-40890",
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                "timestamp": "2026-04-21T20:16:21.788511Z",
                "version": "2.0.3"
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          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-21T20:36:07.854Z",
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        },
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            "tags": [
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        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "markdown",
          "vendor": "gomarkdown",
          "versions": [
            {
              "status": "affected",
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          ]
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      "descriptions": [
        {
          "lang": "en",
          "value": "The package `github.com/gomarkdown/markdown` is a Go library for parsing Markdown text and rendering as HTML. Processing a malformed input containing a \u003c character that is not followed by a \u003e 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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
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            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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      "problemTypes": [
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          "name": "https://github.com/gomarkdown/markdown/security/advisories/GHSA-77fj-vx54-gvh7",
          "tags": [
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          ],
          "url": "https://github.com/gomarkdown/markdown/security/advisories/GHSA-77fj-vx54-gvh7"
        },
        {
          "name": "https://github.com/gomarkdown/markdown/commit/759bbc3e32073c3bc4e25969c132fc520eda2778",
          "tags": [
            "x_refsource_MISC"
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          "url": "https://github.com/gomarkdown/markdown/commit/759bbc3e32073c3bc4e25969c132fc520eda2778"
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      ],
      "source": {
        "advisory": "GHSA-77fj-vx54-gvh7",
        "discovery": "UNKNOWN"
      },
      "title": "github.com/gomarkdown/markdown: Out-of-bounds Read in SmartypantsRenderer"
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  },
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    "dateReserved": "2026-04-15T16:37:22.766Z",
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    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2023-42821 (GCVE-0-2023-42821)

Vulnerability from nvd – Published: 2023-09-22 16:55 – Updated: 2024-09-24 19:27

Title

github.com/gomarkdown/markdown Out-of-bounds Read while parsing citations

Summary

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

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-24 19:26 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7771 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/gomarkdown/markdown/security/a…	x_refsource_CONFIRM
https://github.com/gomarkdown/markdown/commit/14b…	x_refsource_MISC
https://github.com/gomarkdown/markdown/blob/7478c…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
gomarkdown	markdown	Affected: < 0.0.0-20230922105210-14b16010c2ee

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T19:30:24.609Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "name": "https://github.com/gomarkdown/markdown/security/advisories/GHSA-m9xq-6h2j-65r2",
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://github.com/gomarkdown/markdown/security/advisories/GHSA-m9xq-6h2j-65r2"
          },
          {
            "name": "https://github.com/gomarkdown/markdown/commit/14b16010c2ee7ff33a940a541d993bd043a88940",
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/gomarkdown/markdown/commit/14b16010c2ee7ff33a940a541d993bd043a88940"
          },
          {
            "name": "https://github.com/gomarkdown/markdown/blob/7478c230c7cd3e7328803d89abe591d0b61c41e4/parser/citation.go#L69",
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/gomarkdown/markdown/blob/7478c230c7cd3e7328803d89abe591d0b61c41e4/parser/citation.go#L69"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2023-42821",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-24T19:26:08.128213Z",
                "version": "2.0.3"
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          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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    ],
    "cna": {
      "affected": [
        {
          "product": "markdown",
          "vendor": "gomarkdown",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.0.0-20230922105210-14b16010c2ee"
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          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
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            "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"
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      "problemTypes": [
        {
          "descriptions": [
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              "description": "CWE-125: Out-of-bounds Read",
              "lang": "en",
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          ],
          "url": "https://github.com/gomarkdown/markdown/security/advisories/GHSA-m9xq-6h2j-65r2"
        },
        {
          "name": "https://github.com/gomarkdown/markdown/commit/14b16010c2ee7ff33a940a541d993bd043a88940",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/gomarkdown/markdown/commit/14b16010c2ee7ff33a940a541d993bd043a88940"
        },
        {
          "name": "https://github.com/gomarkdown/markdown/blob/7478c230c7cd3e7328803d89abe591d0b61c41e4/parser/citation.go#L69",
          "tags": [
            "x_refsource_MISC"
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        }
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      },
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    }
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  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
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    "datePublished": "2023-09-22T16:55:33.355Z",
    "dateReserved": "2023-09-14T16:13:33.310Z",
    "dateUpdated": "2024-09-24T19:27:42.779Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

CVE-2026-102941 (GCVE-0-2026-102941)

Vulnerability from cvelistv5 – Published: 2026-10-16 15:38 – Updated: 2026-10-16 15:38

Title

gomarkdown/markdown IsSafeURL panics on short URLs

Summary

The package github.com/gomarkdown/markdown is a Go library for parsing Markdown text and rendering as HTML. Prior to 0.0.0-20260724235538-61af6e1e6971, parser.IsSafeURL in parser/parser.go slices url[:nPath] before the len(url) >= nPath guard. A short destination causes a slice-bounds panic when the loop reaches a relative-path prefix for which len(url) < nPath and cap(url) < nPath. The one-byte destination / is an explicit non-panic counterexample because it matches the first valid path and returns before a longer prefix is sliced. Demonstrated panic cases include empty, ., and .. destinations under those conditions. The panic is reachable when markdown.ToHTML renders untrusted Markdown with html.Safelink enabled, including an empty link destination, and is also reachable by callers that pass a short attacker-controlled URL directly to the exported parser.IsSafeURL function. An uncaught panic can terminate the calling process and cause denial of service. This issue is fixed in 0.0.0-20260724235538-61af6e1e6971.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7771 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/gomarkdown/markdown/security/a…	x_refsource_CONFIRM
https://github.com/gomarkdown/markdown/commit/61a…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
gomarkdown	markdown	Affected: < 0.0.0-20260724235538-61af6e1e6971

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "markdown",
          "vendor": "gomarkdown",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.0.0-20260724235538-61af6e1e6971"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "The package github.com/gomarkdown/markdown is a Go library for parsing Markdown text and rendering as HTML. Prior to 0.0.0-20260724235538-61af6e1e6971, parser.IsSafeURL in parser/parser.go slices url[:nPath] before the len(url) \u003e= nPath guard. A short destination causes a slice-bounds panic when the loop reaches a relative-path prefix for which len(url) \u003c nPath and cap(url) \u003c nPath. The one-byte destination / is an explicit non-panic counterexample because it matches the first valid path and returns before a longer prefix is sliced. Demonstrated panic cases include empty, ., and .. destinations under those conditions. The panic is reachable when markdown.ToHTML renders untrusted Markdown with html.Safelink enabled, including an empty link destination, and is also reachable by callers that pass a short attacker-controlled URL directly to the exported parser.IsSafeURL function. An uncaught panic can terminate the calling process and cause denial of service. This issue is fixed in 0.0.0-20260724235538-61af6e1e6971."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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"
          }
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      ],
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          "descriptions": [
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              "cweId": "CWE-125",
              "description": "CWE-125: Out-of-bounds Read",
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              "type": "CWE"
            }
          ]
        }
      ],
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        {
          "name": "https://github.com/gomarkdown/markdown/security/advisories/GHSA-cv23-7vc5-jfh7",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/gomarkdown/markdown/security/advisories/GHSA-cv23-7vc5-jfh7"
        },
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          "name": "https://github.com/gomarkdown/markdown/commit/61af6e1e69710c5ca13cfbaaaa1bc11bc763a8a9",
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        "advisory": "GHSA-cv23-7vc5-jfh7",
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      "title": "gomarkdown/markdown IsSafeURL panics on short URLs"
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CVE-2026-40890 (GCVE-0-2026-40890)

Vulnerability from cvelistv5 – Published: 2026-04-21 19:51 – Updated: 2026-04-21 20:36

Title

github.com/gomarkdown/markdown: Out-of-bounds Read in SmartypantsRenderer

Summary

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.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-21 20:16 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7771 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/gomarkdown/markdown/security/a…	x_refsource_CONFIRM
https://github.com/gomarkdown/markdown/commit/759…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
gomarkdown	markdown	Affected: < 759bbc3e32073c3bc4e25969c132fc520eda2778

Show details on NVD website

JSON

To clipboard

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CVE-2023-42821 (GCVE-0-2023-42821)

Vulnerability from cvelistv5 – Published: 2023-09-22 16:55 – Updated: 2024-09-24 19:27

Title

github.com/gomarkdown/markdown Out-of-bounds Read while parsing citations

Summary

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

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-24 19:26 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7771 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/gomarkdown/markdown/security/a…	x_refsource_CONFIRM
https://github.com/gomarkdown/markdown/commit/14b…	x_refsource_MISC
https://github.com/gomarkdown/markdown/blob/7478c…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
gomarkdown	markdown	Affected: < 0.0.0-20230922105210-14b16010c2ee

Show details on NVD website

JSON

To clipboard

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Find a vulnerability

Search criteria

6 vulnerabilities found for markdown by gomarkdown

CVE-2026-102941 (GCVE-0-2026-102941)

CVE-2026-40890 (GCVE-0-2026-40890)

CVE-2023-42821 (GCVE-0-2023-42821)

CVE-2026-102941 (GCVE-0-2026-102941)

CVE-2026-40890 (GCVE-0-2026-40890)

CVE-2023-42821 (GCVE-0-2023-42821)