Answer in brief
CVE-2026-53956 records a Medium severity (CVSS 5.4) vulnerability in Rattler vulnerable to package cache path traversal via conda package build string. The current sources do not mark it as known exploited. The current feed maps conda/py-rattler (generic), conda/rattler_cache (generic), py_rattler (pip), rattler_cache (rust). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps conda/py-rattler (generic), conda/rattler_cache (generic), py_rattler (pip), rattler_cache (rust). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| conda/py-rattlergeneric | < 0.24.0 | Not reported |
| conda/rattler_cachegeneric | < 0.9.0 | Not reported |
| py_rattlerpip | <=0.23.2 | 0.24.0 |
| rattler_cacherust | <=0.8.2 | 0.9.0 |
Published upstream
Sep 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 10, 2026
Rattler is a library that provides common functionality used within the conda ecosystem. `rattler_cache` prior to version 0.9.0 and `py-rattler` prior to version 0.24.0 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 `rattler_cache` version 0.9.0 or `py-rattler` version 0.24.0 and avoid untrusted conda channels.
Quoted source text, attributed separately from HOL analysis.