CVE-2026-82876

CVSS 9.3 (critical) · published 2026-08-31

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.

Weakness: CWE-347

Source: NVD CVE-2026-82876

References

• https://github.com/trulycrisp/psychite
• https://trulycrisp.github.io/drivefirmware/phison_s11/
• https://www.vulncheck.com/advisories/phison-ps3111-s11-controller-firmware-signature-verification-bypass

Check your software

Connect an AI agent to the FixLane MCP server or ask the Telegram bot to check what you have installed against incidents with a verified fixed version.