CVE-2026-59922

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Source
https://cve.org/CVERecord?id=CVE-2026-59922
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-59922.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-59922
Aliases
Downstream
Related
Published
2026-07-08T16:12:00.545Z
Modified
2026-07-17T18:29:40.401207883Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Mistune plugins/formatting: quadratic-time parsing on long runs of `~~x~~`, `==x==`, and `^^x^^` markers (strikethrough / mark / insert)
Details

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a run of closed tilde, equals-sign, or caret marker pairs around a character causes quadratic work in src/mistune/plugins/formatting.py when the strikethrough, mark, or insert plugin scans for matching markers from each possible start position, allowing denial of service through CPU exhaustion. This issue is fixed in version 3.3.0.

Database specific 
{
    "cwe_ids": [
        "CWE-1333",
        "CWE-407"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59922.json",
    "cna_assigner": "GitHub_M"
}
References

Affected packages

Git / github.com/lepture/mistune

Affected ranges

Type
GIT
Repo
https://github.com/lepture/mistune
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
15c3b79325125272263d7d42492ec8f757447191
Fixed
96d0f57f8fe9eeb06bb4cff521962a27d7c402e7
Database specific 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "3.3.0"
        }
    ],
    "cpe": "cpe:2.3:a:mistune_project:mistune:*:*:*:*:*:*:*:*",
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

v0.*
v0.1.0
v0.2.0
v0.3.0
v0.3.1
v0.4
v0.4.1
v0.5
v0.5.1
v0.6
v0.7
v0.7.1
v0.7.2
v0.7.3
v0.7.4
v0.8
v0.8.1
v0.8.2
v0.8.3
v0.8.4
v2.*
v2.0.0
v2.0.0a1
v2.0.0a2
v2.0.0a3
v2.0.0a4
v2.0.0a5
v2.0.0a6
v2.0.0rc1
v2.0.1
v2.0.2
v3.*
v3.0.0
v3.0.0a1
v3.0.0a2
v3.0.0a3
v3.0.0rc1
v3.0.0rc2
v3.0.0rc3
v3.0.0rc4
v3.0.0rc5
v3.0.1
v3.1.0
v3.1.1
v3.1.2
v3.1.3
v3.1.4
v3.2.0
v3.2.1

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-59922.json"