Improper Handling of Case Sensitivity in pnpm - #VU153397
Published: October 6, 2026
Vulnerability identifier: #VU153397
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-178
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to make distinct dependencies share a virtual store directory.
The vulnerability exists due to ambiguous dependency identifier encoding in virtual store directory naming when mapping URL or local path dependencies to directory names. A remote attacker can supply a dependency identifier with +, #, :, or ? where another identifier has / to make distinct dependencies share a virtual store directory.
Git dependencies pinned with # are also within the scope of this issue.
Affected software
pnpm
Remediation
Install security update from vendor's website.
pnpm - addressed in versions 11.28.5, 12.10.0