CVE-2025-32799
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedConda-build contains commands and tools to build conda packages. Prior to version 25.4.0, the conda-build processing logic is vulnerable to path traversal (Tarslip) attacks due to improper sanitization of tar entry paths. Attackers can craft tar archives containing entries with directory traversal sequences to write files outside the intended extraction directory. This could lead to arbitrary file overwrites, privilege escalation, or code execution if sensitive locations are targeted. This issue has been patched in version 25.4.0.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceConda-build versions prior to 25.4.0 contain a path traversal (Tarslip) vulnerability in the tar archive processing logic. The software fails to properly sanitize tar entry paths, allowing attackers to craft malicious tar archives containing directory traversal sequences (e.g., ../../) that write files outside the intended extraction directory.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 25.4.0CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Verify conda-build is installedRun 'conda list conda-build' or 'pip show conda-build' to check if the package is present in your environmentAffected if conda-build is not installed, the vulnerability does not apply
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Determine the installed version of conda-buildRun 'conda list conda-build' or 'conda-build --version' to retrieve the exact version numberAffected if The version displayed is less than 25.4.0 (for example, 25.3.0, 25.2.0, etc.)
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Confirm the vulnerability applies to tar extraction workflowsVerify that conda-build is used to build packages from recipes, which involves extracting tar archives containing build dependencies or source tarballsAffected if You use conda-build to extract or build from tar archives - this is the core function where the path traversal flaw can be triggered
You are affected if conda-build is installed and its version is below 25.4.0, and you use it to process tar archives during package building.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped25.4.0
Upgrade conda-build to version 25.4.0 or later which contains the patch for proper tar entry path sanitization. If immediate patching is not feasible, implement input validation to reject tar entries containing traversal sequences before extraction.
25.4.0
- Upgrade conda-build to version 25.4.0 or later using: conda install -c conda-forge conda-build>=25.4.0
- Alternatively, upgrade via pip: pip install --upgrade conda-build>=25.4.0
- Verify the upgrade was successful by running: conda-build --version
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing8.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-32799 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-32799 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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