Unauthorized file modification via crafted package manifest

Summary

pnpm is a package manager. From 11.3.0 until 11.5.3, `pnpm stage download` derived a local filename from registry-controlled package name and version fields. A crafted manifest could escape the selected download directory and overwrite another reachable file. The merged fix validates both fields, derives one safe filename, and verifies the final destination before writing. This vulnerability is fixed in 11.5.3. A flaw was found in pnpm, a package manager. A remote attacker could exploit a vulnerability in the `pnpm stage download` command by providing a specially crafted package manifest. This could allow the attacker to write files to arbitrary locations on the system, leading to unauthorized modification of system files and potential integrity compromise. This Important flaw in pnpm allows a remote attacker to achieve arbitrary file write by providing a specially crafted package manifest during the `pnpm stage download` operation. This could lead to unauthorized modification of system files and compromise system integrity, particularly in environments where pnpm processes untrusted package sources. Red Hat severity: Important — CVSS 7.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L). Weakness: CWE-22. No fixing RHSA erratum has published yet; monitor the Red Hat CVE page and patch when it ships.