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CVE-2026-19888— NULL pointer dereference in SCRAM client-final-message parsing in PgBouncer

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.

在 PgBouncer（1.25.2 及更早版本）的 SCRAM 客户端最终消息（client-final-message）解析器中，缺少对强制属性的校验，这使得未认证的远程攻击者能够导致进程崩溃。恶意构造的消息可使解析器报告成功，同时留下某个必需的值未被设置，随后该值作为空指针被解引用，从而引发崩溃。由于崩溃发生在任何凭据验证之前，因此不需要任何有效账户即可触发。此外，由于 PgBouncer 使用单个进程服务于所有客户端，此漏洞将导致所有已池化（pooled）的连接被终止。

CVSS 7.5 · High EPSS 0.39% · P34

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
n/a PgBouncer ≤ 1.25.2 affected
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I. Basic Information for CVE-2026-19888

Vulnerability Information
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Vulnerability Title
NULL pointer dereference in SCRAM client-final-message parsing in PgBouncer
Source: CVE Program / CVE List V5
Vulnerability Description
Missing validation of a mandatory attribute in the SCRAM client-final-message parser in PgBouncer through 1.25.2 allows an unauthenticated remote attacker to crash the process. A malformed message can make the parser report success while leaving a required value unset, which is then dereferenced as a NULL pointer. The crash occurs before any credential is verified, so no valid account is required. Because PgBouncer serves all clients from a single process, this terminates every pooled connection.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
- PgBouncer 0 ~ 1.25.2 -

II. Public POCs for CVE-2026-19888

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III. Intelligence Information for CVE-2026-19888

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Same Patch Batch · n/a · 2026-09-23 · 9 CVEs total

CVE-2026-6668 7.5 HIGH Integer overflow causes an infinite loop in packet buffer growth in PgBouncer
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CVE-2026-79306 6.5 MEDIUM CyberPanel v1.9.1 文件管理器路径遍历漏洞
CVE-2026-6669 5.9 MEDIUM Unbounded SCRAM iteration count causes CPU exhaustion in PgBouncer
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CVE-2025-63564 Moodle Socialwall 3.0-3.3 SQL注入漏洞

IV. Related Vulnerabilities

Same product: PgBouncer
Same vendor: n/a
Same weakness: CWE-476