# Mem0: Cross-tenant conversation leak via unescaped delimiter collision in session-scope key (\_build_session_scope)

Advisory record · `GHSA-5324-3w58-qpp2`

- **Identifiers:** `GHSA-5324-3w58-qpp2` · `CVE-2026-116575`
- **State:** Confirmed
- **Severity:** CVSS 6.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-200](https://cwe.mitre.org/data/definitions/200.html) · [CWE-863](https://cwe.mitre.org/data/definitions/863.html)
- **Tags:** [Information disclosure](https://agentprime.io/advisories/tag/info-disclosure.md) · [Broken access control](https://agentprime.io/advisories/tag/access-control.md)
- **Published:** 28 Oct 2026
- **Updated:** 28 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 28 Oct 2026, 21:17 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `mem0ai` (PyPI): affected `<2.0.18`; fixed in `2.0.18`
- `mem0ai` (npm): affected `<3.1.6`; fixed in `3.1.6`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 6.3 Medium, CVSS 3.1: `CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0011, the 1st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 13:32 UTC: First seen by agentprime
- 31 Oct 2026, 13:32 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-5324-3w58-qpp2)

## Sources

- [GitHub Advisory Database: GHSA-5324-3w58-qpp2](https://github.com/advisories/GHSA-5324-3w58-qpp2)
- [OSV: GHSA-5324-3w58-qpp2](https://osv.dev/vulnerability/GHSA-5324-3w58-qpp2)
- <https://github.com/mem0ai/mem0/security/advisories/GHSA-5324-3w58-qpp2>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-116575>
- <https://github.com/mem0ai/mem0/pull/6892>
- <https://github.com/mem0ai/mem0/commit/71f2ebefa3494da21550fb525216818776cde67f>
- <https://github.com/mem0ai/mem0>
- <https://github.com/mem0ai/mem0/releases/tag/ts-v3.1.6>
- <https://github.com/mem0ai/mem0/releases/tag/v2.0.18>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-5324-3w58-qpp2>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-5324-3w58-qpp2/>. Everything for agents: <https://agentprime.io/llms.txt>.