CVE-2026-41180

Summary: PsiTransfer before 2.4.3 is vulnerable to a path traversal in the upload PATCH flow (/files/:uploadId). The attack can abuse a mounted request path vs the downstream tus handler’s decoded uploadId to cause an unauthenticated attacker to create a file named with a pattern like config..js ...

PsiTransfer: Upload PATCH path traversal can create `config.<NODE_ENV>.js` and lead to code execution on restart

Summary The upload PATCH flow under /files/:uploadId validates the mounted request path using the still-encoded req.path, but the downstream tus handler later writes using the decoded req.params.uploadId. In deployments that use a supported custom PSITRANSFERUPLOADDIR whose basename prefixes a...