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PostgreSQL psql EUVDEUVD-2026-57854

| CVE-2026-6464 HIGH
Inclusion of Functionality from Untrusted Control Sphere (CWE-829)
2026-08-13 f86ef6dc-4d3a-42ad-8f28-e6d5547a5007 GHSA-j447-m374-x28h
PostgreSQL Code Injection Red Hat
8.1
CVSS 3.1 · Vendor: f86ef6dc-4d3a-42ad-8f28-e6d5547a5007
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Severity by source

Vendor (f86ef6dc-4d3a-42ad-8f28-e6d5547a5007) PRIMARY
8.1 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
8.1 HIGH

AC:H reflects the dual-control requirement over both server and data rows; AV:N because the attack is delivered via the PostgreSQL wire protocol from a remote malicious server; PR:N as no client-side privileges are required from the attacker.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
8.1 HIGH
qualitative

Primary rating from Vendor (f86ef6dc-4d3a-42ad-8f28-e6d5547a5007).

CVSS VectorVendor: f86ef6dc-4d3a-42ad-8f28-e6d5547a5007

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

Lifecycle Timeline

3
Patch available
Aug 13, 2026 - 14:02 EUVD
Analysis Generated
Aug 13, 2026 - 13:43 vuln.today
CVE Published
Aug 13, 2026 - 13:19 cve.org
HIGH 8.1

DescriptionCVE.org

Untrusted data inclusion in PostgreSQL psql COPY may allow a server administrator to elicit execution of data lines as psql commands, via error injection. If the "COPY FROM STDIN" or "\copy FROM STDIN" command fails before the server indicates that it awaits input rows, psql processes the in-line data rows as psql commands. "COPY FROM" with a filename is unaffected. The server administrator has no inherent control over the data rows, so a complete attack requires the attacker to separately acquire control of both the server and the data rows. Alternatively, an attacker controlling data rows alone might complete an attack through a coincidental error that they don't control. Versions before PostgreSQL 18.5, 17.11, 16.15, 15.19, and 14.24 are affected.

Articles & Coverage 2

News 18 New PostgreSQL Vulnerabilities - 18 High Severity, No POC Available Aug 14, 2026 News 18 New PostgreSQL Vulnerabilities - 18 High Severity, No POC Available Aug 13, 2026

AnalysisAI

Command injection in the PostgreSQL psql client (versions before 18.5, 17.11, 16.15, 15.19, and 14.24) allows an attacker who controls both a malicious server and the supplied data rows to execute arbitrary psql meta-commands on the connecting client host. The flaw is triggered when a COPY FROM STDIN or \copy FROM STDIN operation fails with a premature server-side error - before the server signals readiness to receive data rows - causing psql to misinterpret the inline data stream as client-side command input rather than row data. No public exploit code has been identified at time of analysis, but the CVSS 8.1 score reflects the potential for full confidentiality, integrity, and availability impact when the dual-control preconditions are met.

Technical ContextAI

The vulnerability resides in the psql interactive terminal client distributed with PostgreSQL, specifically in its protocol state machine for COPY FROM STDIN operations. CWE-829 (Inclusion of Functionality from Untrusted Control Sphere) accurately describes the root cause: when the PostgreSQL wire protocol transitions unexpectedly - with the server sending an error before entering the COPY data-ingestion phase - psql's fallback logic incorrectly routes the pending inline data lines to the command parser rather than discarding them. This means data content (which may come from untrusted sources) is elevated to the trust level of psql meta-commands, including backslash commands capable of invoking shell operations. The flaw is strictly client-side; COPY FROM with a filename argument is unaffected because that variant does not use the same inline data-stream code path. Affected branches span five active major PostgreSQL releases: 14.x before 14.24, 15.x before 15.19, 16.x before 16.15, 17.x before 17.11, and 18.x before 18.5.

RemediationAI

Upgrade the psql client to PostgreSQL 18.5, 17.11, 16.15, 15.19, or 14.24 - the patched release corresponding to the major branch in use - as detailed in the vendor advisory at https://www.postgresql.org/support/security/CVE-2026-6464/. Distribution-specific packages (Debian, RHEL, Ubuntu, Homebrew) may lag the upstream release; verify the installed psql version after updating using psql --version. As a targeted workaround, replace COPY FROM STDIN usage with COPY FROM filename syntax wherever feasible, since the filename variant does not share the vulnerable code path; this requires script modifications and may not be practical in all automation contexts. Organizations that cannot patch immediately should restrict psql use to servers fully under their operational control and audit any automated scripts that pass externally-sourced data through COPY FROM STDIN operations.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected

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EUVD-2026-57854 vulnerability details – vuln.today
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