CVE-2026-59930

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-59930
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59930.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-59930
Aliases
Downstream
Related
Published
2026-07-08T16:13:21Z
Modified
2026-10-28T02:30:42Z
Severity
  • 4.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N CVSS Calculator
Summary
Mistune toc / TableOfContents directive: heading IDs use predictable `toc_N` numbering with no slugification, allowing collision with attacker-controlled `id="toc_N"` content
Details

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the toc plugin and TableOfContents directive generate heading IDs as predictable toc_N values without slugifying the heading text, allowing attacker-controlled id="toc_N" content to collide with generated anchors and redirect same-page navigation, CSS selectors, or JavaScript handlers. This issue is fixed in version 3.3.0.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-1284",
        "CWE-345"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59930.json"
}
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
c4093c4742ed0d10d9332fb8edb455869b7b581b
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:mistune_project:mistune:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "3.3.0"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "range":  [
                {
                    "fixed":  "c4093c4742ed0d10d9332fb8edb455869b7b581b"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v3.3.0",
            "range":  [
                {
                    "fixed":  "15c3b79325125272263d7d42492ec8f757447191"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

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/cve-osv-conversion/osv-output/CVE-2026-59930.json"