CVE-2026-115349

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Source
https://cve.org/CVERecord?id=CVE-2026-115349
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-115349.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-115349
Aliases
  • GHSA-3q64-rw38-243v
Downstream
Related
Published
2026-10-22T19:13:26Z
Modified
2026-11-04T17:27:22Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
Mistune 3.0.0 before 3.3.0 Denial of Service via Nested Bracket Parsing
Details

Mistune from 3.0.0 before 3.3.0 contains an algorithmic complexity denial of service vulnerability in the parse_link_text function in src/mistune/helpers.py. Attackers can submit markdown with deeply nested square brackets triggering quadratic parsing time, exhausting server CPU with small crafted requests.

Database specific 
{
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-1333"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115349.json"
}
References

Affected packages

Git / github.com/lepture/mistune

Affected ranges

Type
GIT
Repo
https://github.com/lepture/mistune
Events
Introduced
4222ee11c119fc8b308c6f8137f35a394e08065b
Fixed
15c3b79325125272263d7d42492ec8f757447191
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "3.0.0"
                },
                {
                    "fixed": "3.3.0"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandardRange"
        },
        {
            "range": [
                {
                    "introduced": "3.0.0"
                },
                {
                    "fixed": "3.3.0"
                }
            ],
            "source": "DESCRIPTION"
        }
    ]
}

Affected versions

v3.*
v3.0.0
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/cve-osv-conversion/osv-output/CVE-2026-115349.json"