CVE-2026-82876
Phison PS3111-S11 firmware allows RSA signature bypass via embedded modulus.
Is CVE-2026-82876 being exploited?
Not confirmed. CVE-2026-82876 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 0.09% probability of exploitation in the next 30 days.
How severe is CVE-2026-82876?
CVE-2026-82876 is rated Critical with a CVSS score of 9.3. 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-2026-82876?
Not known from our data. No patch reference has been recorded for CVE-2026-82876, 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-2026-82876 affect?
CVE-2026-82876 affects Phison PS3111-S11 controller-based SSDs, USB flash drives using PS3111-S11, OEM devices embedding PS3111-S11. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-82876?
Inventory PS3111-S11 devices, isolate removable drives, contact vendors and apply firmware updates when released.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Allows attackers to install arbitrary controller firmware, enabling persistent implants, data theft, drive takeover, or permanent bricking.
Immediate action required
- affectedSBFQT1.3
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.