CVE-2026-115355

LOWCVSS 8.7 · HIGH

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

Mistune before 3.3.0 contains a path traversal vulnerability in the Include directive that allows attackers to read arbitrary files by supplying ../ sequences in include paths. Attackers can also inject HTML through unescaped error messages and included file contents to perform cross-site scripting even when escape=True is set.

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0.0/ 10 priority

Sources & remediation

Other references

https://github.com/lepture/mistune/security/advisories/GHSA-h7ww-273w-6cm8
https://www.vulncheck.com/advisories/mistune-before-3.3.0-path-traversal-and-xss-via-include-directive

Weakness type (CWE)

CWE-22

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Deep dive

Full discourse1 post

DailyCVE@dailycve1d
🔴 Mistune, Path Traversal and XSS, #CVE-2026-115355 (High Severity) -DC-Oct2026-3722 https://dailycve.com/mistune-path-traversal-and-xss-cve-2026-115355-high-severity-dc-oct2026-3722/
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