conda-build: Reliance on Insufficiently Trustworthy Component
CVE-2025-32800 is a critical-severity reliance on insufficiently trustworthy component vulnerability in conda-build from Conda, with a CVSS 3.1 base score of 9.8 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected conda-build versions: < 25.3.0. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 0.67% chance of exploitation within 30 days, higher than 53% of scored CVEs.
Critical severity: a successful attack would have severe impact.
What to do
- Check which version of conda-build you run against the affected versions below, and install the vendor's latest release.
- Read the advisory on github.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Conda | conda-build | < 25.3.0 | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 7.2 | High | CNA (github.com) |
| CVSS 3.1 | 9.8 | Critical | NVD |
Official description
Conda-build contains commands and tools to build conda packages. Prior to version 25.3.0, the pyproject.toml lists conda-index as a Python dependency. This package is not published in PyPI. An attacker could claim this namespace and upload arbitrary (malicious) code to the package, and then exploit pip install commands by injecting the malicious dependency in the solve. This issue has been fixed in version 25.3.0. A workaround involves using --no-deps for pip install-ing the project from the repository.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Reliance on Insufficiently Trustworthy Component
The product is built from multiple separate components, but it uses a component that is not sufficiently trusted to meet expectations for security, reliability, updateability, and maintainability.
How developers prevent this class of flaw
- Regardless of the source, each component should be sufficiently trusted to ensure correct, secure operation of the product. For each component, ensure that its supply chain is well-controlled with sub-tier suppliers using best practices. For third-party software components such as libraries, ensure that they are developed and actively maintained by reputable vendors.
- Maintain a Bill of Materials for all components and sub-components of the product. For software, maintain a Software Bill of Materials (SBOM). According to, An SBOM is a formal, machine-readable inventory of software components and dependencies, information about those components, and their hierarchical relationships.
- Continue to monitor changes in each of the product's components, especially when the changes indicate new vulnerabilities, end-of-life (EOL) plans, supplier practices that affect trustworthiness, etc.
More Reliance on Insufficiently Trustworthy Component vulnerabilities (CWE-1357)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Technical write-ups (may include proof of concept)
- drive.google.com/file/d/18qe97zxcpTn2l84187A9meGCi2Wg-n_Y/viewExploit, Technical Description
Other vulnerabilities in conda-build
- 9.8 Critical severity
- 9.8 Critical severity
- 7.0 High severity
Spotted an error? Tell us.