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CVE-2026-6665— PgBouncer buffer overflow in SCRAM

Quick assessment

Affected
n/a PgBouncer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PgBouncer是PgBouncer社区的一个 PostgreSql 的开源轻量级连接池。 PgBouncer 1.25.2之前版本存在安全漏洞，该漏洞源于SCRAM代码在构建SCRAM客户端最终消息内容时未正确检查strlcat()的返回值，恶意后端发送包含长随机数的SCRAM服务器最终消息可能触发栈溢出。

CVSS 8.1 · High EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
n/a PgBouncer < 1.25.2 affected
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I. Basic Information for CVE-2026-6665

Vulnerability Information
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Vulnerability Title
PgBouncer buffer overflow in SCRAM
Source: CVE Program / CVE List V5
Vulnerability Description
The SCRAM code in PgBouncer before 1.25.2 did not check the return value of strlcat() correctly when building the contents of the SCRAM client-final-message. A malicious backend that sends a SCRAM server-final-message with a long nonce can trigger a stack overflow.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
PgBouncer 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PgBouncer是PgBouncer社区的一个 PostgreSql 的开源轻量级连接池。 PgBouncer 1.25.2之前版本存在安全漏洞，该漏洞源于SCRAM代码在构建SCRAM客户端最终消息内容时未正确检查strlcat()的返回值，恶意后端发送包含长随机数的SCRAM服务器最终消息可能触发栈溢出。
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
- PgBouncer 0 ~ 1.25.2 -

II. Public POCs for CVE-2026-6665

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III. Intelligence Information for CVE-2026-6665

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Same Patch Batch · n/a · 2026-05-09 · 10 CVEs total

CVE-2026-6664 7.5 HIGH PgBouncer integer overflow in PgBouncer network packet parsing
CVE-2026-8193 6.3 MEDIUM Akaunting Invoice PDF Rendering dompdf.php server-side request forgery
CVE-2026-6666 5.9 MEDIUM PgBouncer crash in kill_pool_logins_server_error
CVE-2026-8186 5.3 MEDIUM Open5GS NF client.c ogs_sbi_client_send_via_scp_or_sepp out-of-bounds
CVE-2026-8187 5.3 MEDIUM Open5GS UPF gtp-path.c _gtpv1_u_recv_cb resource consumption
CVE-2026-8195 4.3 MEDIUM JeecgBoot SVG File CommonController.java cross site scripting
CVE-2026-8194 4.3 MEDIUM osTicket Dispatcher class.dispatcher.php cross-site request forgery
CVE-2026-6667 4.3 MEDIUM PgBouncer missing authorization check in KILL_CLIENT admin command
CVE-2026-8196 3.7 LOW JeecgBoot mLogin Endpoint LoginController.java authorization

IV. Related Vulnerabilities

Same product: PgBouncer
Same vendor: n/a
Same weakness: CWE-121

V. Comments for CVE-2026-6665

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