CVE-2026-115353 Mistune - Path Traversal

Mistune < 3.3.0 contains a path traversal caused by improper handling of RST include directive, letting attackers read arbitrary files by supplying relative or absolute paths, exploit requires crafted markdown input.

CVSS base score 8.6 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Path Traversal
Impact
File System Read, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Published
22 October 2026
Updated
23 October 2026
Weakness
CWE-22

Vendor fix

Update to version 3.3.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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