SB20261110272 - Path traversal in granian

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Main Vulnerability Database SB20261110272

SB20261110272 - Path traversal in granian

Published: November 10, 2026

Security Bulletin ID SB20261110272
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Path traversal (CVE-ID: N/A)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to read server-readable files in sibling directories whose names share the configured static mount's path prefix.

The vulnerability exists due to path containment checks using string prefixes without path-component boundaries and permissive route matching in Granian's Windows static-file handling when processing requests with static serving enabled. A remote attacker can request /static-private/secret.txt, /static/../static-private/secret.txt, or /static/%2e%2e/static-private/secret.txt against a /static mount to disclose files from a prefix-sharing sibling directory.


Remediation

Install update from vendor's website.

References