CVE-2026-48988

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Source
https://cve.org/CVERecord?id=CVE-2026-48988
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-48988.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-48988
Aliases
Downstream
Related
Published
2026-06-17T20:54:06.641Z
Modified
2026-07-15T01:48:55.200753794Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
Summary
markdown-it: Quadratic complexity DoS in smartquotes rule via replaceAt string operations
Details

markdown-it is a Markdown parser. Versions 14.1.1 and below contain a denial-of-service vulnerability when typographer: true is enabled, due to quadratic (O(n^2)) processing in the smartquotes rule. The issue stems from repeatedly modifying strings with replaceAt(), which performs O(n) slicing and concatenation per quote character. This can cause excessive CPU consumption when parsing quote-heavy, user-supplied markdown and may let attackers degrade or disrupt service availability. Although typographer is disabled by default, many production apps enable it for smart typography, making the issue relevant. This issue has been fixed in version 14.2.0.

Database specific 
{
    "cwe_ids": [
        "CWE-400"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48988.json"
}
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
829797aa00353ce0b62ddeb9b4583b837b1ffd9b
Fixed
9ce2087562c45d1e5ddd9f76b990f4b3fbe040e5
Database specific 
{
    "cpe": "cpe:2.3:a:markdown-it_project:markdown-it:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "14.2.0"
        }
    ],
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

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
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-2026-48988.json"