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CVE-2026-42198— pgjdbc: Unbounded PBKDF2 iterations in SCRAM authentication allows CPU exhaustion DoS

Quick assessment

Affected
pgjdbc pgjdbc
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

pgJDBC是pgJDBC开源的一个PostgreSQL驱动。 pgJDBC 42.2.0版本至42.7.11之前版本存在安全漏洞，该漏洞源于SCRAM-SHA-256认证期间存在客户端拒绝服务漏洞，恶意服务器可指示驱动程序使用非常大的迭代次数进行SCRAM认证，客户端在PBKDF2中消耗无限CPU时间，loginTimeout未完全缓解此问题，可能导致客户端CPU耗尽和连接池阻塞。

CVSS 7.5 · High EPSS 4.12% · P91

Affected Version Matrix 1

VendorProduct Version RangeStatus
pgjdbc pgjdbc >= 42.2.0, < 42.7.11 affected
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I. Basic Information for CVE-2026-42198

Vulnerability Information
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Vulnerability Title
pgjdbc: Unbounded PBKDF2 iterations in SCRAM authentication allows CPU exhaustion DoS
Source: CVE Program / CVE List V5
Vulnerability Description
pgjdbc is an open source postgresql JDBC Driver. From version 42.2.0 to before version 42.7.11, pgjdbc is vulnerable to a client-side denial of service during SCRAM-SHA-256 authentication. A malicious server can instruct the driver to perform SCRAM authentication with a very large iteration count. With a large enough value, the client spends an unbounded amount of CPU time inside PBKDF2 before authentication can fail. A single attempt ties up a CPU core. Repeated or concurrent attempts exhaust client CPU and can wedge connection pools. In affected versions, loginTimeout did not fully mitigate this problem. When loginTimeout expired, the caller could stop waiting, but the worker thread performing the connection attempt could continue running and burning CPU inside the SCRAM PBKDF2 computation. This issue has been patched in version 42.7.11.
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
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
pgJDBC 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
pgJDBC是pgJDBC开源的一个PostgreSQL驱动。 pgJDBC 42.2.0版本至42.7.11之前版本存在安全漏洞，该漏洞源于SCRAM-SHA-256认证期间存在客户端拒绝服务漏洞，恶意服务器可指示驱动程序使用非常大的迭代次数进行SCRAM认证，客户端在PBKDF2中消耗无限CPU时间，loginTimeout未完全缓解此问题，可能导致客户端CPU耗尽和连接池阻塞。
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
pgjdbc pgjdbc >= 42.2.0, < 42.7.11 -

II. Public POCs for CVE-2026-42198

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III. Intelligence Information for CVE-2026-42198

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Vendor Advisories for CVE-2026-42198 (1)

Vendor Pages for CVE-2026-42198 (1)

IV. Related Vulnerabilities

Same product: pgjdbc
Same vendor: pgjdbc
Same weakness: CWE-770

V. Comments for CVE-2026-42198

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