CVE-2026-6477— PostgreSQL libpq lo_* functions let server superuser overwrite client stack memory
Possible ATT&CK Techniques 2AI
T1203 · Exploitation for Client Execution 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-2026-6477
Vulnerability Information
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Vulnerability Title
PostgreSQL libpq lo_* functions let server superuser overwrite client stack memory
Source: NVD (National Vulnerability Database)
Vulnerability Description
Use of inherently dangerous function PQfn(..., result_is_int=0, ...) in PostgreSQL libpq lo_export(), lo_read(), lo_lseek64(), and lo_tell64() functions allows the server superuser to overwrite a client stack buffer with an arbitrarily-large response. Like gets(), PQfn(..., result_is_int=0, ...) stores arbitrary-length, server-determined data into a buffer of unspecified size. Because both the \lo_export command in psql and pg_dump call lo_read(), the server superuser can overwrite pg_dump or psql stack memory. 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:N/UI:R/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用内在危险函数
Source: NVD (National Vulnerability Database)
Vulnerability Title
PostgreSQL 安全漏洞
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之前版本存在安全漏洞，该漏洞源于libpq中lo_export、lo_read、lo_lseek64和lo_tell64函数使用危险函数PQfn，可能导致服务器超级用户用任意大的响应覆盖客户端栈缓冲区。
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-2026-6477
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-6477 (1)
Same Patch Batch · n/a · 2026-05-14 · 16 CVEs total
| CVE-2026-6473 | 8.8 HIGH | PostgreSQL server undersizes allocations, via integer wraparound |
| CVE-2026-6475 | 8.8 HIGH | PostgreSQL pg_basebackup and pg_rewind can overwrite unrelated files of origin superuser c |
| CVE-2026-6637 | 8.8 HIGH | PostgreSQL refint allows stack buffer overflow and SQL injection |
| 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-2026-6474 | 4.3 MEDIUM | PostgreSQL timeofday() can disclose portions of server memory |
| CVE-2026-6575 | 4.3 MEDIUM | PostgreSQL pg_restore_attribute_stats accepts values that cause query planning to read pas |
| 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-2026-6637
PostgreSQL refint allows stack buffer overflow and SQL injec - 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
Same weakness: CWE-242
V. Comments for CVE-2026-6477
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