Answer in brief
CVE-2026-5758 records a Medium severity (CVSS 6.5) vulnerability in Mafintosh's protocol-buffers-schema is vulnerable to prototype pollution. The current sources do not mark it as known exploited. The current feed maps protocol-buffers-schema (npm). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.5. 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.
The current feed maps protocol-buffers-schema (npm). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| protocol-buffers-schemanpm | >=0 <3.6.1 | 3.6.1 |
Published upstream
Apr 15, 2026
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Sep 10, 2026
JavaScript is vulnerable to prototype pollution in Mafintosh's protocol-buffers-schema Version 3.6.0, where an attacker may alter the application logic, bypass security checks, cause a DoS or achieve remote code execution.
Quoted source text, attributed separately from HOL analysis.