cve-2026-42198

HIGH CVSS 7.5 nvd
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.

Timeline
Published
2026-04-29
Last Modified
2026-09-11
CVSS Details
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
Affected Products
  • postgresql postgresql_jdbc_driver
Weaknesses (CWE)
CWE-770
CVSS metrics
Version Base Severity Vector Exploitability Impact Source
3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 3.9 3.6 security-advisories@github.com
3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 3.9 3.6 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
CPE configurations
OR
CPE Version range Vulnerable
cpe:2.3:a:postgresql:postgresql_jdbc_driver:*:*:*:*:*:*:*:* >= 42.2.0, < 42.7.11 yes
NVD metadata
NVD status
Modified
Source identifier
security-advisories@github.com
References
Linked Vulnerabilities
cpujul2026csaf csaf_oracle
elsa-2026-22304 oracle_linux
elsa-2026-24348 oracle_linux
elsa-2026-25030 oracle_linux 

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  "datePublished": "2026-04-29T16:16:25.427",
  "dateUpdated": "2026-09-11T13:17:58.347",
  "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.",
  "id": "CVE-2026-42198",
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  "source": "nvd",
  "title": "pgjdbc is an open source postgresql JDBC Driver"
}
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