TI-2026-29803 Aliases CVE-2026-41180 GHSA-533q-w4g6-5586

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

HIGH 68CWE-22Published 2026-04-23 · Updated 2026-04-23

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: High
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

PsiTransfer is an open source, self-hosted file sharing solution. Prior to version 2.4.3, 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 `PSITRANSFER_UPLOAD_DIR` whose basename prefixes a startup-loaded JavaScript path, such as `conf`, an unauthenticated attacker can create `config.<NODE_ENV>.js` in the application root. The attacker-controlled file is then executed on the next process restart. Version 2.4.3 contains a patch.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00387 32nd percentileScored 2026-11-07

Fix Fixed psitransfer (psi-4ward): 2.4.3psitransfer (npm): 2.4.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
psi-4ward	psitransfer	before 2.4.3	2.4.3	Patch available	CNA
—	psitransfer (npm)	before 2.4.3	2.4.3	Patch available	GHSA-533q-w4g6-5586

psitransfer Vendorpsi-4ward Affected before 2.4.3 Fixed in 2.4.3 Patch available CNA
psitransfer (npm) Vendor— Affected before 2.4.3 Fixed in 2.4.3 Patch available GHSA-533q-w4g6-5586

Remediation

Fix · CNA psitransfer (psi-4ward) Fixed in 2.4.3
Fix · GHSA-533q-w4g6-5586 psitransfer (npm) Fixed in 2.4.3 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-41180
2026-10-03 Alias added: GHSA-533q-w4g6-5586

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-41180

Other 4

TI-2024-20818 PsiTransfer file integrity violation vulnerability CVSS 3.1MEDIUM 6.5
TI-2024-20817 PsiTransfer vulnerable to violation of the integrity of file distribution CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences