Bug 2494181 - CVE-2026-12490 nsd: Bypass of client certificate verification with transfer over TLS [epel-all]
Summary: CVE-2026-12490 nsd: Bypass of client certificate verification with transfer o...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora EPEL
Classification: Fedora
Component: nsd
Version: epel10
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: ---
Assignee: Paul Wouters
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["919c2a5e-9b29-44d4-8193-1...
Depends On:
Blocks: CVE-2026-12490
TreeView+ depends on / blocked
 
Reported: 2026-06-29 13:43 UTC by Marco Benatto
Modified: 2026-08-03 01:04 UTC (History)
3 users (show)

Fixed In Version: nsd-4.15.0-1.el10_3 nsd-4.15.0-1.el10_2 nsd-4.15.0-1.fc44 nsd-4.15.0-1.fc43
Clone Of:
Environment:
Last Closed: 2026-08-03 00:25:19 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)

Description Marco Benatto 2026-06-29 13:43:53 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.

When a "provide-xfr" is given with a "tls-auth-name", a secondary requesting a transfer should provide a client certificate with that name. However, no client certificate is needed when the request comes in over TLS over the regular "tls-port" (and not the "tls-auth-port") or over over TCP over the regular port, when the other conditions of the "provide-xfr" rule match.

The transfer security restrictions for client certificates can be bypassed completely if the attacker can match the other access control conditions, and the "tls-auth-xfr-only" option is not explicitly set to "yes" (which it bydefault is not)

Comment 1 Fedora Update System 2026-07-25 09:34:44 UTC
FEDORA-2026-0b77a23312 (nsd-4.15.0-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-0b77a23312

Comment 2 Fedora Update System 2026-07-25 09:34:45 UTC
FEDORA-2026-d86ace09cb (nsd-4.15.0-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-d86ace09cb

Comment 3 Fedora Update System 2026-07-26 01:25:30 UTC
FEDORA-EPEL-2026-484870f7f9 has been pushed to the Fedora EPEL 10.3 testing repository.

You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-484870f7f9

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

Comment 4 Fedora Update System 2026-07-26 01:34:55 UTC
FEDORA-EPEL-2026-6030526353 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-2026-6030526353

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

Comment 5 Fedora Update System 2026-07-26 01:35:01 UTC
FEDORA-2026-0b77a23312 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-2026-0b77a23312`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-0b77a23312

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

Comment 6 Fedora Update System 2026-07-26 01:56:02 UTC
FEDORA-2026-d86ace09cb 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-d86ace09cb`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-d86ace09cb

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

Comment 7 Fedora Update System 2026-08-03 00:25:19 UTC
FEDORA-EPEL-2026-484870f7f9 (nsd-4.15.0-1.el10_3) has been pushed to the Fedora EPEL 10.3 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 8 Fedora Update System 2026-08-03 00:35:51 UTC
FEDORA-EPEL-2026-6030526353 (nsd-4.15.0-1.el10_2) has been pushed to the Fedora EPEL 10.2 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 9 Fedora Update System 2026-08-03 00:44:47 UTC
FEDORA-2026-d86ace09cb (nsd-4.15.0-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 10 Fedora Update System 2026-08-03 01:04:59 UTC
FEDORA-2026-0b77a23312 (nsd-4.15.0-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.


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