Bug 2539631 - CVE-2026-19888 pgbouncer: PgBouncer: Denial of Service via malformed SCRAM client-final-message [fedora-all]
Summary: CVE-2026-19888 pgbouncer: PgBouncer: Denial of Service via malformed SCRAM cl...
Keywords:
Status: ON_QA
Alias: None
Product: Fedora
Classification: Fedora
Component: pgbouncer
Version: rawhide
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: ---
Assignee: Devrim Gündüz
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["f03f78a3-eda6-4e55-8ed5-7...
Depends On:
Blocks: CVE-2026-19888
TreeView+ depends on / blocked
 
Reported: 2026-09-23 18:31 UTC by Vladimir Vasilev
Modified: 2026-09-27 02:29 UTC (History)
3 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Type: ---
Embargoed:


Attachments (Terms of Use)

Description Vladimir Vasilev 2026-09-23 18:31:10 UTC
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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.

Comment 1 Fedora Update System 2026-09-26 16:53:29 UTC
FEDORA-2026-851c3ccde8 (pgbouncer-1.26.0-1.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-851c3ccde8

Comment 2 Fedora Update System 2026-09-27 01:46:45 UTC
FEDORA-2026-851c3ccde8 has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-851c3ccde8`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-851c3ccde8

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 3 Fedora Update System 2026-09-27 01:57:02 UTC
FEDORA-EPEL-2026-39a80c0763 has been pushed to the Fedora EPEL 10.4 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-39a80c0763

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 4 Fedora Update System 2026-09-27 02:03:35 UTC
FEDORA-EPEL-2026-237c7e9b4d has been pushed to the Fedora EPEL 10.2 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-237c7e9b4d

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 5 Fedora Update System 2026-09-27 02:06:24 UTC
FEDORA-2026-99030761e8 has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-99030761e8`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-99030761e8

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 6 Fedora Update System 2026-09-27 02:16:24 UTC
FEDORA-EPEL-2026-62de33e876 has been pushed to the Fedora EPEL 9 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-62de33e876

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 7 Fedora Update System 2026-09-27 02:29:50 UTC
FEDORA-2026-6197f5c17e has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-6197f5c17e`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-6197f5c17e

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.


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