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SCA: security update for mermaid (GHSA-xcj9-5m2h-648r)

medium Tenable Self-Hosted Container Security Plugin ID 441734

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts.
 Versions 10.9.5 and prior, in addition to 11.0.0-alpha.1 through 11.12.0 are vulnerable to CSS injection
 through improper sanitization. The state diagram (and any other diagram type that routes user-controlled
 style strings through the createCssStyles parser) captures classDef values using an unrestricted regex
 that matches everything up to a newline. That value then flows unsanitized through addStyleClass() into
 createCssStyles() and is assigned to style.innerHTML, so a closing brace (}) in the value terminates the
 generated CSS selector and turns everything after it into a new CSS rule on the page. This enables page
 defacement, user tracking via url() callbacks, and DOM attribute exfiltration. This issue has been fixed
 in versions 10.9.6 and 11.15.0. If developers are unable to immediately upgrade, they can work around this
 issue by setting "securityLevel": "sandbox", which prevents the issue by rendering the mermaid diagram in
 a sandboxed <iframe>. (CVE-2026-41148)

Solution

Update the mermaid library and its related packages to version 10.9.6 or later.

See Also

https://github.com/advisories/GHSA-xcj9-5m2h-648r

Plugin Details

Severity: Medium

ID: 441734

Version: Revision 1.3

Type: Local

Family: SCA Checks

Published: 5/12/2026

Updated: 5/27/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 2.3

Percentile: 9.4

Vendor

Vendor Severity: Medium

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2026-41148

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 5.3

Threat Score: 1.3

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/11/2026

Vulnerability Publication Date: 5/11/2026

Reference Information

CVE: CVE-2026-41148

cwe: CWE-94