---
title: "CVE-2026-55615: Langroid: Neo4jChatAgent executes LLM-generated Cypher without validation (prompt-to-Cypher injection; config-conditional RCE), mirroring the SQLChatAgent bug fixed in CVE-2026-25879"
url: https://erroneo.us/security/cve/CVE-2026-55615/
description: "CVE-2026-55615 (langroid (PyPI)): Langroid is a framework for building large-language-model-powered applications. Prior to version 0.65.5, Neo4jChatAgent…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-07-09
date_modified: 2026-07-10
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-55615"
kev: false
cvss: 9.2
epss: 0.00461
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-55615: Langroid: Neo4jChatAgent executes LLM-generated Cypher without validation (prompt-to-Cypher injection; config-conditional RCE), mirroring the SQLChatAgent bug fixed in CVE-2026-25879

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.5% , percentile 39: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 39% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes langroid (PyPI) <= 0.65.4, fixed in 0.65.5 . Check your lockfile, including transitive dependencies.

## What it is

Langroid is a framework for building large-language-model-powered applications. Prior to version 0.65.5, Neo4jChatAgent passes LLM-generated Cypher queries straight to the Neo4j driver with no validation, no statement-type allowlist, and no opt-out gate. The query text is influenceable by prompt injection (direct user input or indirect content the agent reads back via RAG), so an attacker who can influence the prompt can read or destroy all graph data and, when APOC or dbms.security procedures are enabled on the server, achieve OS-command and filesystem access. This is the same defect class and threat model as the SQLChatAgent prompt-to-SQL-to-RCE issue fixed in version 0.63.0 (CVE-2026-25879); that fix did not extend to the neo4j module. Version 0.65.5 contains a fix for the neo4j module.

## Affected packages

- PyPI `langroid` <= 0.65.4 → fixed: 0.65.5

## Affected products (CVE record)

- langroid langroid: < 0.65.5

## Severity

- GitHub_M CVSS 4.0: 9.2 `CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`
- GitHub CVSS 4.0: 9.2 `CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.46% probability of exploitation activity in the next 30 days; percentile 39.

## Sources

- [GitHub Advisory GHSA-2pq5-3q89-j7cc](https://github.com/advisories/GHSA-2pq5-3q89-j7cc)
- [CVE.org record CVE-2026-55615](https://www.cve.org/CVERecord?id=CVE-2026-55615)
- [NVD entry CVE-2026-55615](https://nvd.nist.gov/vuln/detail/CVE-2026-55615)
- [github.com](https://github.com/langroid/langroid/security/advisories/GHSA-2pq5-3q89-j7cc)
- [github.com](https://github.com/langroid/langroid/commit/5a3097d9dd6378b08ced5480b0caf76cc58d00fa)

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Source page: https://erroneo.us/security/cve/CVE-2026-55615/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt