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pglogical EUVDEUVD-2026-49938

| CVE-2026-50738 HIGH
Use After Free (CWE-416)
2026-07-28 EDB GHSA-7pcx-4vjw-f9pr
Memory Corruption Use After Free RCE PostgreSQL Pglogical
7.7
CVSS 4.0 · Vendor: EDB
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Severity by source

Vendor (EDB) PRIMARY
7.7 HIGH
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.5 HIGH

Network attack, high complexity race condition, low privileges, no UI, complete confidentiality, integrity, and availability impact.

3.1 AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (EDB).

CVSS VectorVendor: EDB

CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Jul 28, 2026 - 19:02 EUVD
Analysis Generated
Jul 28, 2026 - 18:51 vuln.today
CVE Published
Jul 28, 2026 - 17:55 cve.org
HIGH 7.7

DescriptionCVE.org

A use-after-free condition exists in pglogical's worker signaling code, where a worker structure can be dereferenced after the underlying slot has been freed or recycled during normal worker lifecycle events. The condition is reachable during normal replication operation, including by a low-privileged user able to influence worker start, stop, and restart timing through permitted pglogical operations. In the typical case the condition crashes replication workers, causing an availability impact. In the worst case a use-after-free in a PostgreSQL backend can be leveraged as a remote code execution primitive at the privilege of that backend.

Articles & Coverage 1

News 3 New PostgreSQL Vulnerabilities - 2 Critical, 1 High Jul 29, 2026

AnalysisAI

Remote code execution in pglogical extension for PostgreSQL allows a low-privileged user to crash replication workers, with potential for arbitrary code execution. A use-after-free condition in worker signaling code is triggered during normal replication operations when worker lifecycle events race. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate as low-privileged PostgreSQL user
Delivery
Trigger rapid worker start/stop/restart operations via pglogical functions
Exploit
Race condition frees worker structure while still referenced
Execution
Worker dereferences stale pointer
Impact
Process crash or code execution with database backend privileges
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Vulnerability AssessmentAI

Exploitation The attacker must be an authenticated low-privileged PostgreSQL user with the permissions required to perform pglogical operations that influence worker lifecycle (starting, stopping, restarting replication). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 4.0 score 7.7 (High) with network attack vector, high attack complexity, low privileges required, and no user interaction. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A low-privileged PostgreSQL user executes a series of allowed pglogical commands to start, stop, and restart a replication worker in rapid succession, creating a race condition where a freed worker structure is still referenced. This causes the worker to crash, and an attacker with precise timing can leverage the use-after-free to execute arbitrary code within the PostgreSQL backend process.
Remediation Upgrade to a patched version of pglogical as soon as available per the EnterpriseDB advisory (https://www.enterprisedb.com/docs/security/advisories/cve202650738/). … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-49938 vulnerability details – vuln.today
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