GitHub Advisoryadvisory · crates.io, PyPI

GHSA-h672-p7h7-97v9 Rattler vulnerable to package cache path traversal via conda package build string

MEDIUM Published 2026-07-09 Modified 2026-07-09 Official page ↗
Aliases
CVE-2026-53956
Ecosystem
crates.io, PyPI
Packages
rattler_cache, py_rattler
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
Weaknesses
CWE-22, CWE-73
Reviewed
2026-07-09

Affected packages

• crates.io rattler_cache: < 0.9.0 → fixed in 0.9.0 • PyPI py_rattler: < 0.24.0 → fixed in 0.24.0

Description

`rattler_cache` and `py-rattler` were vulnerable to package-cache path traversal when handling package metadata from conda channels. During cache materialization, the `ratter_cache` code used the package record `build` string as part of a cache key that was joined into a filesystem path. A malicious or untrusted channel could publish repodata with path separators or traversal components in that field, causing package contents to be written outside the configured package cache directory. The issue requires use of a malicious or otherwise untrusted conda channel. Curated channels that validate package metadata are not expected to allow malformed build strings of this form. Users should upgrade to a patched version and avoid untrusted conda channels.

Related

Alias · CVE (1)

  • CVE-2026-53956 Rattler is a library that provides common functionality used within the conda ecosystem. vulnerability

Weakness · CWE (2)

  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory weakness
  • CWE-73 External Control of File Name or Path weakness

References