Mastra Memory API Thread Ownership Check Is a No-op When mapUserToResourceId Is Unset (CVE-2026-82273) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-82273

Mastra Memory API Thread Ownership Check Is a No-op When mapUserToResourceId Is Unset

Answer in brief

CVE-2026-82273 records a Unknown severity vulnerability in Mastra Memory API Thread Ownership Check Is a No-op When mapUserToResourceId Is Unset. The current sources do not mark it as known exploited. The current feed maps mastra-ai/mastra (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 28, 2026Updated Aug 28, 2026Source checked Aug 28, 2026First seen by HOL Aug 28, 2026Material review Aug 28, 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 mastra-ai/mastra (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
mastra-ai/mastrageneric	0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for mastra-ai/mastra.
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 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 28, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 28, 2026

Sources and claim methodology

Upstream source description

Mastra through 1.63.0 contains an authentication bypass vulnerability in the memory API thread ownership validation when mapUserToResourceId callback is omitted from configuration. Authenticated attackers can enumerate all threads via GET /api/memory/threads and read conversation history and metadata of other resource owners.

Quoted source text, attributed separately from HOL analysis.