CVE-2026-115355 Mistune - Path Traversal & Stored XSS

Mistune < 3.3.0 contains a path traversal and stored XSS caused by improper sanitization in the Include directive, letting attackers read arbitrary files and inject HTML, exploit requires crafted include paths.

CVSS base score 7.5 /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, Stored XSS
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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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