Bug 2559969

Summary: CVE-2026-93601 ntpd-rs: rustls-webpki: Name Constraint Bypass in wildcard certificate validation [fedora-all]
Product: [Fedora] Fedora Reporter: Ronit Dey <rdey>
Component: ntpd-rsAssignee: Fabio Valentini <decathorpe>
Status: CLOSED ERRATA QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: rawhideCC: decathorpe, rust-sig
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["94568926-7455-4c8f-8f71-63ce67f08abb"]}
Fixed In Version: ntpd-rs-1.7.2-3.fc45 ntpd-rs-1.7.2-3.fc44 ntpd-rs-1.7.2-3.fc43 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-11-02 00:56:30 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2538656    

Description Ronit Dey 2026-10-23 15:50:49 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.

rustls-webpki (the Rust webpki fork used by rustls) versions >= 0.101.0 and prior to 0.103.12 and 0.104.0-alpha.6 incorrectly accepted permitted-subtree DNS name constraints for certificates asserting a wildcard name. For example, a name constraint of accept.example.com was treated as satisfied by a certificate for *.example.com, which could feasibly assert reject.example.com — a name outside the permitted subtree. Because name constraints are restrictions applied to otherwise properly issued certificates, the issue is only reachable after signature verification succeeds and requires a misissued wildcard certificate to exploit.

Comment 1 Fedora Update System 2026-10-24 15:23:31 UTC
FEDORA-2026-3f206513bb (ntpd-rs-1.7.2-3.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-3f206513bb

Comment 2 Fedora Update System 2026-10-24 15:23:32 UTC
FEDORA-2026-d43ed51df4 (ntpd-rs-1.7.2-3.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-d43ed51df4

Comment 3 Fedora Update System 2026-10-24 15:23:32 UTC
FEDORA-2026-a9929d5b4b (ntpd-rs-1.7.2-3.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-a9929d5b4b

Comment 4 Fedora Update System 2026-10-25 02:05:31 UTC
FEDORA-2026-d43ed51df4 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-d43ed51df4`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-d43ed51df4

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

Comment 5 Fedora Update System 2026-10-25 02:21:46 UTC
FEDORA-2026-3f206513bb 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-2026-3f206513bb`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-3f206513bb

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

Comment 6 Fedora Update System 2026-10-25 02:27:16 UTC
FEDORA-2026-a9929d5b4b 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-a9929d5b4b`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-a9929d5b4b

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

Comment 7 Fedora Update System 2026-11-02 00:56:30 UTC
FEDORA-2026-d43ed51df4 (ntpd-rs-1.7.2-3.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 8 Fedora Update System 2026-11-02 01:29:21 UTC
FEDORA-2026-3f206513bb (ntpd-rs-1.7.2-3.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 9 Fedora Update System 2026-11-02 01:45:55 UTC
FEDORA-2026-a9929d5b4b (ntpd-rs-1.7.2-3.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.