Bug 2559971

Summary: CVE-2026-93601 asciinema: rustls-webpki: Name Constraint Bypass in wildcard certificate validation [fedora-all]
Product: [Fedora] Fedora Reporter: Ronit Dey <rdey>
Component: asciinemaAssignee: Gustavo Costa <xfgusta>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: low Docs Contact:
Priority: low    
Version: rawhideCC: carlwgeorge, rust-sig, xfgusta
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["94568926-7455-4c8f-8f71-63ce67f08abb"]}
Fixed In Version: asciinema-3.2.0-5.fc45 asciinema-3.0.0-8.fc44 asciinema-3.0.0-8.fc43 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-11-02 00:56:41 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 15:51:26 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 21:05:04 UTC
FEDORA-2026-d0727c4729 (asciinema-3.2.0-5.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-d0727c4729

Comment 2 Fedora Update System 2026-10-24 21:05:05 UTC
FEDORA-2026-050bc124df (asciinema-3.0.0-8.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-050bc124df

Comment 3 Fedora Update System 2026-10-24 21:05:05 UTC
FEDORA-2026-884487ccab (asciinema-3.0.0-8.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-884487ccab

Comment 4 Fedora Update System 2026-10-25 02:05:35 UTC
FEDORA-2026-d0727c4729 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-d0727c4729`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-d0727c4729

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 02:21:50 UTC
FEDORA-2026-884487ccab 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-2026-884487ccab`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-884487ccab

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 02:27:18 UTC
FEDORA-2026-050bc124df 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-2026-050bc124df`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-050bc124df

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 00:56:41 UTC
FEDORA-2026-d0727c4729 (asciinema-3.2.0-5.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 01:29:26 UTC
FEDORA-2026-884487ccab (asciinema-3.0.0-8.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 01:45:57 UTC
FEDORA-2026-050bc124df (asciinema-3.0.0-8.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.