Rattler vulnerable to entry-point path traversal in noarch:python install (arbitrary file write)

Summary

Rattler is a library that provides common functionality used within the conda ecosystem. Prior to version 0.43.2, `EntryPoint::FromStr` in `rattler_conda_types` performs only `.trim()` on the `command` field before the linker joins it onto the install prefix and writes an executable Python script. A malicious `noarch:python` package can ship an `info/link.json` with an entry-point name containing `..`, `/`, `\`, or an absolute path; the resulting file is written outside the prefix (or clobbers an existing in-prefix entry-point such as `bin/pip`) with mode `0o775` on Unix and a copied launcher `.exe` on Windows. This affects the default install path of `pixi install`, `mamba install` via py-rattler, `rattler-build`, and any other consumer of the `rattler` install crate; no flag or post-link-script opt-in is involved. Version 0.43.2 contains a fix for the issue.

Timeline

1. Jul 21, 2026, 5:47 PM UTCCVE published
2. Jul 23, 2026, 2:20 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Jul 23, 2026, 2:20 PM UTCRecord last updated

Affected versions

• conda rattler

  fixed in 0.43.2

• conda py-rattler

  fixed in 0.24.0

• conda rattler-build

  fixed in 0.65.0

• prefix-dev pixi

  fixed in 0.69.0

• py-rattlerPyPI

  fixed in 0.24.0

• rattlercrates.io

  fixed in 0.43.2

References 2