Bug 2512873

Summary: CVE-2026-71437 nextcloud: Mermaid: Prototype pollution vulnerability allows potential arbitrary code execution [epel-all]
Product: [Fedora] Fedora EPEL Reporter: Ganesh <gnaik>
Component: nextcloudAssignee: Andrew Bauer <zonexpertconsulting>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: epel10CC: pampelmuse, zonexpertconsulting
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["536200e2-eed0-4bca-8f62-fe4c74d3b37c"]}
Fixed In Version: nextcloud-34.0.3-1.el10_2 nextcloud-34.0.3-1.fc44 nextcloud-34.0.3-1.el10_3 nextcloud-34.0.3-1.fc43 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-08-25 00:27:52 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: 2512224    

Description Ganesh 2026-08-09 07:14:35 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.

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 11.5.0 until 11.16.1, Mermaid Architecture Diagrams are vulnerable to prototype pollution when a diagram defines a group with an id of __proto__. Because the group id is used directly as an object property key without validation, an attacker who can supply diagram text can pollute Object.prototype, potentially affecting the behavior of the embedding application. This issue is fixed in version 11.16.1.

Comment 1 Fedora Update System 2026-08-16 21:15:34 UTC
FEDORA-EPEL-2026-b2421df34a (nextcloud-34.0.3-1.el10_3) has been submitted as an update to Fedora EPEL 10.3.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-b2421df34a

Comment 2 Fedora Update System 2026-08-16 21:17:19 UTC
FEDORA-2026-a1368a72b4 (nextcloud-34.0.3-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-a1368a72b4

Comment 3 Fedora Update System 2026-08-16 21:17:51 UTC
FEDORA-2026-625cbe86c8 (nextcloud-34.0.3-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-625cbe86c8

Comment 4 Fedora Update System 2026-08-16 21:22:06 UTC
FEDORA-EPEL-2026-15025fbfe6 (nextcloud-34.0.3-1.el10_2) has been submitted as an update to Fedora EPEL 10.2.
https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-15025fbfe6

Comment 5 Fedora Update System 2026-08-17 01:17:37 UTC
FEDORA-EPEL-2026-15025fbfe6 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-2026-15025fbfe6

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

Comment 6 Fedora Update System 2026-08-17 01:31:26 UTC
FEDORA-2026-a1368a72b4 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-a1368a72b4`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-a1368a72b4

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

Comment 7 Fedora Update System 2026-08-17 01:33:32 UTC
FEDORA-EPEL-2026-b2421df34a 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-b2421df34a

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

Comment 8 Fedora Update System 2026-08-17 01:50:42 UTC
FEDORA-2026-625cbe86c8 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-2026-625cbe86c8`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-625cbe86c8

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

Comment 9 Fedora Update System 2026-08-25 00:27:52 UTC
FEDORA-EPEL-2026-15025fbfe6 (nextcloud-34.0.3-1.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 10 Fedora Update System 2026-08-25 01:02:01 UTC
FEDORA-2026-a1368a72b4 (nextcloud-34.0.3-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 11 Fedora Update System 2026-08-25 01:06:59 UTC
FEDORA-EPEL-2026-b2421df34a (nextcloud-34.0.3-1.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 12 Fedora Update System 2026-08-25 01:15:47 UTC
FEDORA-2026-625cbe86c8 (nextcloud-34.0.3-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.