Bug 2512896 - CVE-2026-71438 nextcloud: Mermaid: Prototype pollution vulnerability via configuration APIs [epel-all]
Summary: CVE-2026-71438 nextcloud: Mermaid: Prototype pollution vulnerability via conf...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora EPEL
Classification: Fedora
Component: nextcloud
Version: epel10
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: ---
Assignee: Andrew Bauer
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["5fa9ca30-8abc-485c-b41c-9...
Depends On:
Blocks: 2512216
TreeView+ depends on / blocked
 
Reported: 2026-08-09 07:23 UTC by Ganesh
Modified: 2026-08-25 01:15 UTC (History)
2 users (show)

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
Clone Of:
Environment:
Last Closed: 2026-08-25 00:27:58 UTC
Type: ---
Embargoed:


Attachments (Terms of Use)

Description Ganesh 2026-08-09 07:23:18 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. Prior to 10.9.8 and 11.16.1, Mermaid's configuration setters (mermaid.initialize, mermaidAPI.setConfig, and mermaidAPI.updateSiteConfig) merge caller-supplied configuration into Mermaid's internal config using the assignWithDepth deep-merge helper, which is vulnerable to prototype pollution. This is only exploitable if an application forwards untrusted data directly into one of these configuration entry points, which is outside their documented usage; diagram-supplied configuration (e.g. %%{init: {}}%% or YAML frontmatter) is not affected. This issue is fixed in versions 10.9.8 and 11.16.1.

Comment 1 Fedora Update System 2026-08-16 21:15:39 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 21:17:24 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 21:17:57 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 21:22:11 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 01:17:42 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 01:31:30 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 01:33:36 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 01:50:46 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 00:27:58 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 01:02:05 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 01:07:03 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 01:15:51 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.


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