EUVD-2026-83430Severity by source
AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Authenticated partman_user (PR:L), AC:H for the superuser-BGW plus text/UUID-keyed-set preconditions, scope change and full C/I/A from superuser-level SQL and OS command execution.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
4DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
SQL injection in pg_partman prior to 5.5.0 allows an authenticated PostgreSQL role holding the documented partman_user privileges to plant arbitrary SQL in the writable part_config.time_dncoder column and have it executed when routine maintenance or partition-inspection functions later interpolate that value into dynamic SQL. Because the injected statement runs with the privileges of the invoking operation, deployments whose pg_partman_bgw.role GUC is still pointed at a superuser role (the historical default before 5.5.0) can be escalated to database-wide compromise and operating-system command execution as the PostgreSQL service account, and the poisoned configuration row can re-establish elevated access on subsequent background-worker ticks. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires an authenticated role holding the documented partman_user privileges (write access to part_config), so it is not remotely unauthenticated. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority vulnerability, though not the top-tier of its batch. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade pg_partman to 5.5.0 (release notes: https://github.com/pgpartman/pg_partman/releases/tag/v5.5.0; fix commit ba9405542acf24dd881845b935cab8b165854361; advisory GHSA-gmw2-52wc-258g) and run ALTER EXTENSION pg_partman UPDATE. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory every PostgreSQL instance running pg_partman (SELECT extname, extversion FROM pg_extension WHERE extname = 'pg_partman') to identify all deployments below 5.5.0, and immediately inspect the pg_partman_bgw.role setting on each - any instance still pointing that GUC at a superuser role should be repointed to a dedicated low-privilege role, and the contents of part_config (particularly the time_dncoder column) should be reviewed and any unexpected values removed. …
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External POC / Exploit Code
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