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CVE-2026-82876

CriticalPublished

Phison PS3111-S11 Controller Firmware Signature Verification Bypass

Published: Aug 31, 2026
Updated: Sep 2, 2026
Assigning CNA: VulnCheck
Evidence observed: Sep 4, 2026

Primary CVSS

9.3/ 10Critical

nvd · CVSS 4.0

CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS probability estimate

0.1%

Low · next 30 days

Percentile: 0.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Phison PS3111-S11 controller firmware verifies RSA signatures using a public modulus embedded within the firmware image itself rather than anchored in immutable storage. Attackers can generate arbitrary RSA key pairs, sign modified firmware with the private key, embed the matching modulus in the signature segment, and the controller accepts the tampered firmware as valid.

Sources

the-key-ships-with-the-lock-cve-2026-82876-phison-s11-ssd-firmware-signature-bypassPoC
Proof-of-concept demonstrating a firmware signature verification bypass in Phison S11 SSDs, allowing attackers to re-sign modified firmware by embedding their own RSA modulus.

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