hippo-memory@1.38.0

Biologically-inspired memory system for AI agents. Decay by default, strength through use.

AI Security Review

scanned 14d ago · by lpm-firewall-ai

Source inspection found an install-time repair limited to an already opted-in Codex wrapper and agent hook setup reached through the explicit CLI init command. The flagged project, prediction, capture, embedding, and hook files provided no concrete attack behavior in the inspected excerpts.

Static reason

One or more suspicious static signals were detected.; source matched previously finalized malicious package; routed for review; previous stored version diff introduced dangerous source

Trigger

Package installation invokes postinstall; project hook setup is triggered by running hippo init.

Impact

No unconsented first-time agent configuration change or concrete malicious effect was established.

Mechanism

Postinstall calls a repair routine for an existing Codex wrapper. The CLI init command detects agent project files and adds hooks to existing instruction files.

AI rationale

Evidence

package.jsonscripts/postinstall.cjsdist/postinstall.jsdist/cli.jsdist/capture.jsdist/hooks.d.tsdist/hooks.jsdist/embedding-provider.jsdist/project-identity.jsdist/src/project-identity.jsdist/predictions.jsdist/src/predictions.js

Decision evidence

public snapshot

AI called this Clean at 91.0% confidence as Benign with low false-positive risk.

Evidence for AI clean decision

package.json declares a postinstall wrapper that loads dist/postinstall.js; the postinstall code repairs a Codex wrapper only for users who previously installed it.
Agent hook installation is called by the explicit hippo init command and can be disabled with --no-hooks.
The init hook detector checks for agent-related project files, and the implementation patches an instruction file only when it already exists.
The other flagged files contain project identity, capture, prediction, provider, and hook declarations or paths; the inspected excerpts show no concrete malicious behavior.

Evidence against

No inspected source shows credential theft, hidden network exfiltration, destructive behavior, or an automatic first-time agent configuration change during package installation.

Behavioral surface

Source

ChildProcessCryptoDynamicRequireEnvironmentVarsEvalFilesystemNetworkShell

Supply chain

Source & flagged code

11 flagged

package.jsonView file

•scripts.postinstall = node scripts/postinstall.cjs

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node scripts/postinstall.cjs

Medium

Ambiguous Install Lifecycle Script

Install-time lifecycle script is not statically allowlisted and needs review.

package.jsonView on unpkg

dist/rerankers/cross-encoder.jsView file

Lines 1-29javascript

1import { createRequire } from 'node:module';

2const MODEL_NAME = 'Xenova/ms-marco-MiniLM-L-6-v2';

3// Use Function constructor to bypass TypeScript static module resolution

4// for optional peer dependencies that may not be installed (mirrors the

5// pattern in src/embeddings.ts).

6// SAFETY: this declares the contract we require from the dynamically

7// imported package (a `pipeline` factory, top-level or under `default`);

8// loadTransformersModule validates the resolved value is callable via

9// isPipelineFactory before it is ever invoked.

10const _dynImport = new Function('s', 'return import(s)');

11const _require = createRequire(import.meta.url);

Low

Eval

Package source references a known benign dynamic code generation pattern.

dist/rerankers/cross-encoder.jsView on unpkg · L9

12const TRANSFORMERS_PACKAGES = ['@huggingface/transformers', '@xenova/transformers'];

13function resolveTransformersPackage() {

14 for (const name of TRANSFORMERS_PACKAGES) {

15 try {

16 _require.resolve(name);

17 return name;

18 }

19 catch {

20 // Try the legacy fallback only when the preferred package is not installed.

21 }

22 }

23 return null;

24}

25function isPipelineFactory(value) {

26 return typeof value === 'function';

27}

28async function loadTransformersModule() {

29 // Import one backend only. Loading both native ONNX runtimes in one process

dist/db.jsView file

Lines 1-28javascript

1import * as fs from 'fs';

2import * as os from 'os';

3import * as path from

dist/hooks.jsView file

•Manifest-trigger-reachable source links an external AI-agent control path to a behavior-bearing write operation. } } } return out; } function [redacted](historypath, startoffsetbytes) { if (!fs.existssync(historypath)) return []; const raw = fs.readfilesync(historypath); if (startoffsetbytes >= raw.length) return []; const delta = raw.subarray(startoffsetbytes).tostring('utf8'); const seen = new set(); const ordered = []; for (const line of delta.split('\n')) { if (!line.trim()) continue; try { const parsed = json.parse(line); const sessionid = parsed.session_id; if (isjsonstring(sessionid) && sessionid && !seen.has(sessionid)) { seen.add(sessionid);

High

Trigger Reachable External Ai Agent Control Surface Mutation

Manifest-trigger-reachable source writes behavior-bearing configuration into a user or project AI-agent control surface.

dist/hooks.jsView on unpkg

dist/embedding-provider.js#virtual:normalized:round1View file

•stage = ast_semantic_analysis; reason = ast_parse_error; limitedFiles = 8

High

Semantic Analysis Limited

A bounded semantic-analysis stage reached its safety limit; remaining detectors completed, but this package requires AI review.

dist/embedding-provider.js#virtual:normalized:round1View on unpkg

dist/project-identity.jsView file

•matchType = normalized_sha256 matchedPackage = hippo-memory@1.24.0 matchedPath = dist/project-identity.js matchedIdentity = npm:aGlwcG8tbWVtb3J5:1.24.0 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

dist/project-identity.jsView on unpkg

dist/src/project-identity.jsView file

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

dist/src/project-identity.jsView on unpkg

dist/predictions.jsView file

•matchType = normalized_sha256 matchedPackage = hippo-memory@1.24.0 matchedPath = dist/predictions.js matchedIdentity = npm:aGlwcG8tbWVtb3J5:1.24.0 similarity = 1.000 summary = normalized source hash matched finalized malicious source

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

dist/predictions.jsView on unpkg

dist/src/predictions.jsView file

High

Known Malware Source Similarity

Source file is highly similar to a previously finalized malicious package; route for source-aware review.

dist/src/predictions.jsView on unpkg

dist/cli.jsView file

•matchType = previous_version_dangerous_delta matchedPackage = hippo-memory@1.40.0 matchedIdentity = npm:aGlwcG8tbWVtb3J5:1.40.0 similarity = 0.792 summary = stored previous version shares package body but lacks this dangerous source file

High

Previous Version Dangerous Delta

This package version adds a dangerous source file absent from the previous stored version; route for source-aware review.

dist/cli.jsView on unpkg

Source & flagged code

11 flagged · loading source

package.jsonView file

•scripts.postinstall = node scripts/postinstall.cjs

High

Install Time Lifecycle Scripts

Package defines install-time lifecycle scripts.

package.jsonView on unpkg

•scripts.postinstall = node scripts/postinstall.cjs

Medium

Ambiguous Install Lifecycle Script

Install-time lifecycle script is not statically allowlisted and needs review.

package.jsonView on unpkg

dist/rerankers/cross-encoder.jsView file

9// isPipelineFactory before it is ever invoked. L10: const _dynImport = new Function('s', 'return import(s)'); L11: const _require = createRequire(import.meta.url);

Low

Eval

Package source references a known benign dynamic code generation pattern.

dist/rerankers/cross-encoder.jsView on unpkg · L9

Findings

8 High5 Medium6 Low

HighInstall Time Lifecycle Scriptspackage.json

HighTrigger Reachable External Ai Agent Control Surface Mutationdist/hooks.js

HighSemantic Analysis Limiteddist/embedding-provider.js#virtual:normalized:round1

HighKnown Malware Source Similaritydist/project-identity.js

HighKnown Malware Source Similaritydist/src/project-identity.js

HighKnown Malware Source Similaritydist/predictions.js

HighKnown Malware Source Similaritydist/src/predictions.js

HighPrevious Version Dangerous Deltadist/cli.js

MediumAmbiguous Install Lifecycle Scriptpackage.json

MediumDynamic Requiredist/db.js

MediumNetwork

Medium

Affected versions and remediation

This report applies to hippo-memory@1.38.0.

See all versions of hippo-memory for other recorded verdicts.

Review the evidence and your use of hippo-memory@1.38.0 before allowing it. Restrict the permissions described in this report.
Choose an independently verified alternative or release. This report does not establish that other versions are safe.

Evidence last updated: 2026-10-09 05:42:43.733Z (UTC).

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