Buffer overflow in Merbanan Rtl 433
CVE-2026-117609
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.
EPSS exploit prediction
EPSS: 0.004 (28.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
The 30-day trend appears once there are two daily scores.
Affected products
Weakness classification (CWE)
References
- github.com/merbanan/rtl_433/issues/3739 (issue-tracking)
- github.com/merbanan/rtl_433/pull/3740 (issue-tracking, patch)
- github.com/merbanan/rtl_433/commit/f35183aaf1d2d905d422fd70bcae4eb7349d6186 (patch)
- github.com/merbanan/rtl_433/blob/25.12/src/devices/proflame2.c (technical-description)
- github.com/merbanan/rtl_433 (product)
- www.vulncheck.com/advisories/rtl-433-through-25.12-stack-based-buffer-overflow-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-117609?
- CVE-2026-117609 is a high-severity vulnerability in Merbanan Rtl 433, classified under Stack-based Buffer Overflow. CVSS score: 7.1/10. Published 2026-10-28.
- How severe is CVE-2026-117609?
- High severity. CVSS v3 base score is 7.1 out of 10.