CVE-2026-111766

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Source
https://cve.org/CVERecord?id=CVE-2026-111766
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-111766.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-111766
Aliases
Downstream
CGA (27)
CLSA (1)
DEBIAN (1)
Published
2026-10-19T19:47:46Z
Modified
2026-10-21T02:55:48Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
markdown-it: Quadratic-time denial of service in inline HTML parsing with html enabled
Details

markdown-it is a Markdown parser. Prior to 14.3.3 and 15.0.3, when the html option or commonmark preset is enabled and the constructs occur inside a paragraph, attacker-controlled Markdown containing repeated unterminated inline HTML comments, processing instructions, declarations, or CDATA sections reaches src/rules_inline/html_inline.ts. Its HTML_TAG_RE match searches the remaining suffix for the appropriate terminator; when no terminator is present, parsing advances to the next opener and repeats the match over overlapping input, causing quadratic processing and denial of service through event-loop blocking or an unresponsive browser main thread. HTML blocks and the default HTML-disabled configuration are not affected by these payloads. This issue is fixed in versions 14.3.3 and 15.0.3.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-400",
        "CWE-407"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/111xxx/CVE-2026-111766.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "introduced":  "15.0.0"
                        },
                        {
                            "fixed":  "15.0.3"
                        },
                        {
                            "fixed":  "14.3.3"
                        }
                    ],
                    "source":  "AFFECTED_FIELD",
                    "strategy":  "StringRangeExpression"
                }
            ]
        },
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "fixed":  "14.3.3"
                        },
                        {
                            "fixed":  "14.3.3"
                        }
                    ],
                    "source":  "DESCRIPTION"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/markdown-it/markdown-it

Affected ranges

Type
GIT
Repo
https://github.com/markdown-it/markdown-it
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
928bc8c11ded60181c0e7fc5aa954eec582e8e79
Fixed
d99f48839d37af6fd8a2617516c43dab90755503
Fixed
d372f0d8a68bef0b0acaa68868ce8ae8ba85b384
Fixed
a8c00d474ec9b304fad9b71c16d6fa8b4909279e
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "fixed":  "928bc8c11ded60181c0e7fc5aa954eec582e8e79"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "range":  [
                {
                    "fixed":  "d99f48839d37af6fd8a2617516c43dab90755503"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "14.3.3",
            "range":  [
                {
                    "fixed":  "d372f0d8a68bef0b0acaa68868ce8ae8ba85b384"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "original_tag":  "15.0.3",
            "range":  [
                {
                    "fixed":  "a8c00d474ec9b304fad9b71c16d6fa8b4909279e"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

10.*
10.0.0
11.*
11.0.0
11.0.1
12.*
12.0.0
12.0.1
12.0.2
12.0.3
12.0.4
12.0.5
12.0.6
12.1.0
12.2.0
12.3.0
12.3.1
12.3.2
13.*
13.0.0
13.0.1
13.0.2
14.*
14.0.0
14.1.0
14.1.1
14.2.0
14.3.0
14.3.1
14.3.2
15.*
15.0.0
15.0.1
15.0.2
2.*
2.0.0
2.1.0
2.1.1
2.1.2
2.1.3
2.2.0
2.2.1
3.*
3.0.0
3.0.1
3.0.2
3.0.3
3.0.4
3.0.5
3.0.6
3.0.7
3.1.0
4.*
4.0.0
4.0.1
4.0.2
4.0.3
4.1.0
4.1.1
4.1.2
4.2.0
4.2.1
4.2.2
4.3.0
4.3.1
4.4.0
5.*
5.0.0
5.0.1
5.0.2
5.0.3
5.1.0
6.*
6.0.0
6.0.1
6.0.2
6.0.3
6.0.4
6.0.5
6.1.0
6.1.1
7.*
7.0.0
7.0.1
8.*
8.0.0
8.0.1
8.1.0
8.2.0
8.2.1
8.2.2
8.3.0
8.3.1
8.3.2
8.4.0
8.4.1
8.4.2
9.*
9.0.0
9.0.1
9.1.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-111766.json"