CVE-2026-82876 Phison PS3111-S11 Controller Firmware Signature Verification Bypass
Attackers can bypass firmware signature verification to install malicious code on Phison SSD controllers by embedding a rogue public key.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-82876?
CVE-2026-82876 is a critical vulnerability in Phison Electronics Corporation PS3111-S11 Controller Firmware, published on 31 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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
Which versions are affected by CVE-2026-82876?
How do I fix CVE-2026-82876?
No fix has been published for CVE-2026-82876 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-82876 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-82876 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-r5jx-v7f9-8wxc.