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PostgreSQL CVE-2026-6637

| EUVDEUVD-2026-30291 HIGH
Stack-based Buffer Overflow (CWE-121)
2026-05-14 PostgreSQL GHSA-96xx-m79q-xh44
Stack Overflow SQLi Buffer Overflow PostgreSQL RCE Suse
8.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
8.8 HIGH
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SUSE
HIGH
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Patch available
May 14, 2026 - 15:01 EUVD
Analysis Generated
May 14, 2026 - 14:02 vuln.today
CVE Published
May 14, 2026 - 13:00 nvd
HIGH 8.8

DescriptionCVE.org

Stack buffer overflow in PostgreSQL module "refint" allows an unprivileged database user to execute arbitrary code as the operating system user running the database. A distinct attack is possible if the application declares a user-controlled column as a "refint" cascade primary key and facilitates user-controlled updates to that column. In that case, a SQL injection allows a primary key update value provider to execute arbitrary SQL as the database user performing the primary key update. Versions before PostgreSQL 18.4, 17.10, 16.14, 15.18, and 14.23 are affected.

AnalysisAI

Stack buffer overflow in PostgreSQL's refint module allows low-privileged database users to execute arbitrary code as the database operating system user across all supported versions before 14.23, 15.18, 16.14, 17.10, and 18.4. The vulnerability enables two distinct attack paths: direct stack overflow leading to OS-level code execution, and SQL injection when applications expose user-controlled columns configured as refint cascade primary keys. With CVSS 8.8 (AV:N/AC:L/PR:L) and network-based exploitation requiring only low-privilege database credentials, this represents a critical privilege escalation risk for PostgreSQL deployments. No active exploitation (CISA KEV) or public POC identified at time of analysis.

Technical ContextAI

The refint module in PostgreSQL implements referential integrity constraints for foreign key relationships. CWE-121 (stack-based buffer overflow) indicates unsafe memory operations in refint's handling of cascade operations on primary key updates. When user input exceeds allocated stack buffer space during refint constraint processing, attackers can overwrite return addresses or function pointers to redirect execution flow. The secondary SQL injection vector arises when applications bind user-controlled data to columns participating in refint cascade relationships, allowing injection of arbitrary SQL during the primary key update propagation phase. CPE identifier cpe:2.3:a:n/a:postgresql confirms this affects the core PostgreSQL database engine across major version branches 14 through 18.

RemediationAI

Upgrade immediately to patched versions: PostgreSQL 18.4, 17.10, 16.14, 15.18, or 14.23 depending on your major version branch. Download patches from official PostgreSQL release channels at https://www.postgresql.org/support/security/CVE-2026-6637/ and follow standard PostgreSQL upgrade procedures including pre-upgrade backups and testing. If immediate patching is not feasible, implement compensating controls: (1) Revoke database privileges from untrusted users, particularly permissions to modify tables using refint constraints - note this may break application functionality requiring dynamic schema modifications. (2) Deploy database firewall rules restricting network connections to trusted application servers only, reducing AV:N to AV:A attack surface but not eliminating risk from compromised application servers. (3) For the SQL injection vector specifically, audit application code to identify any user-controlled columns declared as refint cascade primary keys and implement strict input validation or remove refint declarations - this requires code changes and schema migrations. (4) Enable PostgreSQL audit logging (pgaudit extension) to detect exploitation attempts via unusual refint operations or primary key update patterns. All compensating controls provide partial risk reduction only; version upgrade remains the definitive mitigation.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise Module for Basesystem 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Fixed

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CVE-2026-6637 vulnerability details – vuln.today
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