CVE-2025-32797

What it is

Conda-build contains commands and tools to build conda packages. Prior to version 25.3.1, the write_build_scripts function in conda-build creates the temporary build script conda_build.sh with overly permissive file permissions (0o766), allowing write access to all users. Attackers with filesystem access can exploit a race condition to overwrite the script before execution, enabling arbitrary code execution under the victim's privileges. This risk is significant in shared environments, potentially leading to full system compromise. Even with non-static directory names, attackers can monitor parent directories for file creation events. The brief window between script creation (with insecure permissions) and execution allows rapid overwrites. Directory names can also be inferred via timestamps or logs, and automation enables exploitation even with semi-randomized paths by acting within milliseconds of detection. This issue has been patched in version 25.3.1. A workaround involves restricting conda_build.sh permissions from 0o766 to 0o700 (owner-only read/write/execute). Additionally, use atomic file creation (write to a temporary randomized filename and rename atomically) to minimize the race condition window.

At a glance

Exploitability

Can be exploited locally on the machine without logging in. High risk of data tampering, service disruption.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2025-06-16 19:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 09:12 UTC Last updatedMost recent change to the record

Details

Published

2025-06-16 19:15 UTC

Last modified

2026-06-17 09:12 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-277

Record status

Analyzed

Affected

• Anaconda conda-build < 25.3.1

Attack profile CVSS 4.0 · 6.0

Attack vector

Local

Complexity

Low

Attack requirements

Present

Privileges needed

None

User interaction

None

Confidentiality

Low

Integrity

High

Availability

High