pgjdbc: Unbounded PBKDF2 iterations in SCRAM authentication allows CPU exhaustion DoS

Summary

CVE	CVE-2026-42198
State	PUBLISHED
Assigner	GitHub_M
Source Priority	CVE Program / NVD first with legacy fallback
Published	2026-04-29 16:16:25 UTC
Updated	2026-08-18 12:19:10 UTC
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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.032610000 probability, percentile 0.873270000 (date 2026-08-18)

Problem Types: CWE-770 | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling | CWE-770 Allocation of Resources Without Limits or Throttling

Version	Source	Type	Score	Severity	Vector
3.1	ADP	CVSS	7.5	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
3.1	[email protected]	Secondary	7.5	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
3.1	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	Secondary	7.5	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`
3.1	CNA	DECLARED	7.5	HIGH	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`

CVSS v3.1 Breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Application	Postgresql	Postgresql Jdbc Driver	All	All	All	All

Vendor Declared Affected Products

Source	Vendor	Product	Version	Platforms
CNA	Pgjdbc	Pgjdbc	affected >= 42.2.0, < 42.7.11	Not specified
ADP	Red Hat	Red Hat Build Of Quarkus 3.27.3.SP2	Not specified	Not specified
ADP	Red Hat	Red Hat Enterprise Linux 10	unaffected 0:42.7.2-1.el10_2.2 * rpm	Not specified
ADP	Red Hat	Red Hat Enterprise Linux 10.0 Extended Update Support	unaffected 0:42.7.1-7.el10_0.1 * rpm	Not specified
ADP	Red Hat	Red Hat Enterprise Linux 8	unaffected 0:42.2.14-4.el8_10 * rpm	Not specified
ADP	Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	unaffected 0:42.2.14-5.el8_8.1 * rpm	Not specified
ADP	Red Hat	Red Hat Enterprise Linux 8.8 Update Services For SAP Solutions	unaffected 0:42.2.14-5.el8_8.1 * rpm	Not specified
ADP	Red Hat	Red Hat Enterprise Linux 9	unaffected 0:42.2.28-2.el9_8.2 * rpm	Not specified
ADP	Red Hat	Red Hat Enterprise Linux 9.2 Update Services For SAP Solutions	unaffected 0:42.2.28-1.el9_2.1 * rpm	Not specified
ADP	Red Hat	Red Hat Enterprise Linux 9.4 Update Services For SAP Solutions	unaffected 0:42.2.28-1.el9_4.1 * rpm	Not specified
ADP	Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	unaffected 0:42.2.28-1.el9_6.1 * rpm	Not specified
ADP	Red Hat	Red Hat AMQ Broker 7	Not specified	Not specified
ADP	Red Hat	Red Hat Enterprise Linux 6	Not specified	Not specified
ADP	Red Hat	Red Hat Enterprise Linux 7	Not specified	Not specified

References

Reference	Source	Link	Tags
access.redhat.com/errata/RHSA-2026:52928	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	access.redhat.com
access.redhat.com/errata/RHSA-2026:25030	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	access.redhat.com
access.redhat.com/errata/RHSA-2026:19098	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	access.redhat.com
access.redhat.com/errata/RHSA-2026:52930	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	access.redhat.com
bugzilla.redhat.com/show_bug.cgi	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	bugzilla.redhat.com
github.com/pgjdbc/pgjdbc/releases/tag/REL42.7.11	[email protected]	github.com	Release Notes
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42198.json	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	security.access.redhat.com
github.com/pgjdbc/pgjdbc/security/advisories/GHSA-98qh-xjc8-98pq	[email protected]	github.com	Vendor Advisory
access.redhat.com/errata/RHSA-2026:54532	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	access.redhat.com
access.redhat.com/errata/RHSA-2026:52978	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	access.redhat.com
access.redhat.com/errata/RHSA-2026:24348	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	access.redhat.com
access.redhat.com/security/cve/CVE-2026-42198	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	access.redhat.com
access.redhat.com/errata/RHSA-2026:52929	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	access.redhat.com
access.redhat.com/errata/RHSA-2026:22304	0b0ca135-0b70-47e7-9f44-1890c2a1c46c	access.redhat.com
CVE Program record	CVE.ORG	www.cve.org	canonical
NVD vulnerability detail	NVD	nvd.nist.gov	canonical, analysis

No vendor comments have been submitted for this CVE.

Additional Advisory Data

Source	Time	Event
ADP	2026-04-29T17:00:59.186Z	Reported to Red Hat.
ADP	2026-04-29T15:58:49.174Z	Made public.

Solutions

ADP: RHSA-2026:52928: Red Hat Enterprise Linux AppStream EUS (v. 10.0)

ADP: RHSA-2026:24348: Red Hat Enterprise Linux AppStream (v. 10)

ADP: RHSA-2026:25030: Red Hat Enterprise Linux AppStream (v. 8)

ADP: RHSA-2026:52978: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8)

ADP: RHSA-2026:54532: Red Hat Enterprise Linux AppStream E4S (v.9.2)

ADP: RHSA-2026:52929: Red Hat Enterprise Linux AppStream E4S (v.9.4)

ADP: RHSA-2026:52930: Red Hat Enterprise Linux AppStream EUS (v.9.6)

ADP: RHSA-2026:22304: Red Hat Enterprise Linux AppStream (v. 9)

ADP: RHSA-2026:19098: Red Hat build of Quarkus 3.27.3.SP2

There are currently no legacy QID mappings associated with this CVE.