Vulnerability
CVE-2026-55559
Yamcs: unauthenticated remote code execution
Most severe levelDEFCON 4 · Moderate risk
Official data
- CVSS 3.1
- 9.8 · critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 0.78% estimated probability of exploitation in the next 30 days, higher than 56% of CVEs
- CISA KEV catalogue
- No
Sources: NVD (CVSS, weakness, publication), FIRST (EPSS), CISA (KEV catalogue).
Data read on 15 November 2026.
Timeline
- 28 August 2026Published on NVD
- 29 August 2026First in the DefenceLevel briefing
In DefenceLevel briefings2 days
- 15 November 2026New in the last 24 hoursDEFCON 4
- 29 August 2026Worth watching
Last 12 months.
The full analysis is in the briefingThe full analysis is in your archive
Why it matters now, who is affected and what to do: every day at 05:00 UTC, for subscribers.Why it matters, who is affected and what to do, as in the daily briefing.