CVE-2026-39255
RCE via buffer overflow in SteelSeries GG (macOS) libSSEdevice.dylib
Is CVE-2026-39255 being exploited?
Not confirmed. CVE-2026-39255 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.56% probability of exploitation in the next 30 days.
How severe is CVE-2026-39255?
CVE-2026-39255 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-39255?
Not known from our data. No patch reference has been recorded for CVE-2026-39255, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-39255 affect?
CVE-2026-39255 affects SteelSeries GG (macOS) v107.0.0, libSSEdevice.dylib, macOS systems running SteelSeries GG. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-39255?
Uninstall/disable SteelSeries GG or block its network; apply vendor patch when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution on macOS via libSSEdevice.dylib (dup_wcs) buffer overflow, enabling arbitrary code execution under the user context.
Immediate action required