VulnerabilityPublished 12 Nov 2026

CVE-2026-116312: PostgreSQL · Improper Preservation of Consistency Between Independent Representations of Shared State

Affects PostgreSQLSource CVE Database V5

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Not known to be exploited · CVSS 5.4 Medium · fixed in 18.7 : update PostgreSQL when convenient.

Data as of 12 Nov 2026, 14:49 UTC

CVSS 3.1 base score

5.4Medium

How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none

CVSS scores by source
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:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality: Low
Integrity: Low
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation 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.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade PostgreSQL to 18.7, 17.12, 16.16 or 15.20.

Affected software

Product	Affected	Fixed in
PostgreSQL	Affected >=18 <18.7	Fixed in 18.7
PostgreSQL	Affected >=17 <17.12	Fixed in 17.12
PostgreSQL	Affected >=16 <16.16	Fixed in 16.16
PostgreSQL	Affected >=15 <15.20	Fixed in 15.20

AI-suggested

Upgrading PostgreSQL to versions 15.20, 16.16, 17.12, or 18.7 or later will resolve this vulnerability. Users should apply these official fixes to ensure correct trigger behavior during MERGE operations on partitioned tables. No additional mitigation is indicated by the vendor advisory.

Description

CVE-2026-116312 is a vulnerability in PostgreSQL affecting versions 15 through 18 prior to specific minor releases. It involves improper preservation of consistency between independent representations of shared state during a MERGE operation on partitioned tables. This flaw can cause an AFTER trigger to process the wrong new row when a MERGE performs an INSERT before an UPDATE. The issue is fixed in PostgreSQL versions 15.20, 16.16, 17.12, and 18.7.

Impact

An attacker with permission to modify table data using MERGE on partitioned tables could cause AFTER triggers to operate on incorrect row data. This may lead to unintended trigger side effects, potentially impacting data integrity or application logic relying on triggers. The CVSS score of 5.4 (medium severity) reflects limited confidentiality and integrity impact without availability impact. There are no known exploits in the wild.

References

postgresql.org/support/security/CVE-2026-116312/ (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 12 Nov 2026, 14:48 UTC

Technical details

References

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