Phison PS3111-S11 Controller Firmware Signature Verification Bypass (CVE-2026-82876) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-82876

Phison PS3111-S11 Controller Firmware Signature Verification Bypass

Answer in brief

CVE-2026-82876 records a Unknown severity vulnerability in Phison PS3111-S11 Controller Firmware Signature Verification Bypass. The current sources do not mark it as known exploited. The current feed maps Phison Electronics Corporation/PS3111-S11 Controller Firmware (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 31, 2026Updated Aug 31, 2026Source checked Aug 31, 2026First seen by HOL Aug 31, 2026Material review Aug 31, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Phison Electronics Corporation/PS3111-S11 Controller Firmware (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Phison Electronics Corporation/PS3111-S11 Controller Firmwaregeneric	SBFQT1.3	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Phison Electronics Corporation/PS3111-S11 Controller Firmware.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 31, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 31, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 31, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.