PostgreSQL MERGE · Inconsistent Transition-capture State
Source GCVE Database
Not known to be exploited · CVSS 5.4 Medium · fixed in 18.7 : update PostgreSQL when convenient.
Data as of 12 Nov 2026, 16:33 UTC
Thin evidence
One scorer or none| CNA (PostgreSQL) | CVSS 3.1 | 5.4 |
|---|
- Patch
- Available – fixed in 18.7, 17.12, 16.16 +1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 12 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 12 Nov 2026.
What to do
Upgrade PostgreSQL and postgresql/postgresql to 18.7, 17.12, 16.16 or 15.20.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| PostgreSQL | Affected
| Fixed in
|
| PostgreSQL | Affected
| Fixed in
|
| PostgreSQL | Affected
| Fixed in
|
| PostgreSQL | Affected
| Fixed in
|
Postgresqlpostgresql/postgresqlpkg:deb/postgresql/postgresqlOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Until patched, users should be cautious when using MERGE with partitioned tables and AFTER triggers. Monitoring vendor updates for fixed versions 15.20, 16.16, 17.12, and 18.7 is recommended.
Description
A vulnerability in PostgreSQL's MERGE command causes inconsistent transition-capture state, allowing an AFTER trigger to process an incorrect new row when using partitioned table MERGE operations that perform an INSERT before an UPDATE. This affects PostgreSQL major versions 15 through 18, specifically versions before 15.20, 16.16, 17.12, and 18.7. Versions prior to 15 are not affected.