SB2026042471 - Link following in wasm-micro-runtime

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Main Vulnerability Database SB2026042471

SB2026042471 - Link following in wasm-micro-runtime

Published: April 24, 2026

Security Bulletin ID SB2026042471
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Link following (CVE-ID: CVE-2025-43853)

CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote attacker to access files outside of the filesystem sandbox.

The vulnerability exists due to improper access control in the uvwasi filesystem handling when processing symlinks containing backslashes on Windows. A remote attacker can create a crafted symlink and open it to access files outside of the filesystem sandbox.

On Windows, the issue can also allow creation of a file on the host outside of the preopened directory when the symlink is opened with the create flag.


Remediation

Install update from vendor's website.

References