CVE-2026-6637— PostgreSQL refint allows stack buffer overflow and SQL injection
Possible ATT&CK Techniques 3AI
T1118 T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 5
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| n/a | PostgreSQL | 18< 18.4 | affected |
17< 17.10 | affected | ||
16< 16.14 | affected | ||
15< 15.18 | affected | ||
< 14.23 | affected |
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I. Basic Information for CVE-2026-6637
Vulnerability Information
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Vulnerability Title
PostgreSQL refint allows stack buffer overflow and SQL injection
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
栈缓冲区溢出
Source: NVD (National Vulnerability Database)
Vulnerability Title
PostgreSQL SQL注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PostgreSQL是PostgreSQL组织的一套自由的对象关系型数据库管理系统。该系统支持大部分SQL标准并且提供了许多其他特性，例如外键、触发器、视图等。 PostgreSQL 18.4之前版本、17.10之前版本、16.14之前版本、15.18之前版本和14.23之前版本存在SQL注入漏洞，该漏洞源于refint模块存在栈缓冲区溢出，可能导致未授权数据库用户以运行数据库的操作系统用户身份执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| - | PostgreSQL | 18 ~ 18.4 | - |
II. Public POCs for CVE-2026-6637
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · n/a · 2026-05-14 · 16 CVEs total
| CVE-2026-6477 | 8.8 HIGH | PostgreSQL libpq lo_* functions let server superuser overwrite client stack memory |
| CVE-2026-6475 | 8.8 HIGH | PostgreSQL pg_basebackup and pg_rewind can overwrite unrelated files of origin superuser c |
| CVE-2026-6473 | 8.8 HIGH | PostgreSQL server undersizes allocations, via integer wraparound |
| CVE-2026-6479 | 7.5 HIGH | PostgreSQL SSL/GSS init causes denial of service, via uncontrolled recursion |
| CVE-2026-6476 | 7.2 HIGH | PostgreSQL pg_createsubscriber allows SQL injection via subscription name |
| CVE-2026-6478 | 6.5 MEDIUM | PostgreSQL discloses MD5-hashed passwords via covert timing channel |
| CVE-2026-6472 | 5.4 MEDIUM | PostgreSQL CREATE TYPE does not check multirange schema CREATE privilege |
| CVE-2026-6575 | 4.3 MEDIUM | PostgreSQL pg_restore_attribute_stats accepts values that cause query planning to read pas |
| CVE-2026-6474 | 4.3 MEDIUM | PostgreSQL timeofday() can disclose portions of server memory |
| CVE-2026-6638 | 3.7 LOW | PostgreSQL REFRESH PUBLICATION allows SQL injection via table name |
| CVE-2026-24710 | Northern.tech CFEngine Enterprise 跨站脚本漏洞 | |
| CVE-2026-24711 | Northern.tech CFEngine Enterprise 安全漏洞 | |
| CVE-2026-24712 | Northern.tech CFEngine 安全漏洞 | |
| CVE-2026-38740 | Foscam VD1 Video Doorbell 安全漏洞 | |
| CVE-2025-69443 | Archon 安全漏洞 |
IV. Related Vulnerabilities
Same product: PostgreSQL
- CVE-2026-6638
PostgreSQL REFRESH PUBLICATION allows SQL injection via tabl - CVE-2026-6575
PostgreSQL pg_restore_attribute_stats accepts values that ca - CVE-2026-6479
PostgreSQL SSL/GSS init causes denial of service, via uncont - CVE-2026-6478
PostgreSQL discloses MD5-hashed passwords via covert timing - CVE-2026-6477
PostgreSQL libpq lo_* functions let server superuser overwri
Same vendor: n/a
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Open5GS NRF client.c ogs_sbi_client_add denial of service - CVE-2026-8730
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Open5GS NRF message.c denial of service - CVE-2026-8728
Open5GS NRF conv.c ogs_sbi_discovery_option_parse_plmn_list - CVE-2026-8724
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