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 .
CVE-2026-41148
“—” beside the score: it is equal to the CVSS score beside it.
This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (27th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2026-31515 (ENISA EUVD) · GHSA-xcj9-5m2h-648r (GitHub Security Advisories)Source: ENISA EUVD
- Lower severity and no public exploit yet
A fix is available — apply it.
- CVSS v3
- 5.3
- EG Score
- 5.3MEDIUMmedium confidence
- EG Risk
- 24EG Risk 24/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity53% × 45%Impact severity (EG Severity): CVSS 5.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.3% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- 0.3%
- EPSS %ILE
- 27th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (5.3): severity, escalated by confirmed exploitation. This CVE's 5.3 is its impact severity (EG Severity), not escalated.
- EG Severity
- 5.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
- EG Likelihood
- 0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.
A fix is available. Apply it within your standard update timelines.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
May 22, 2026
Last Modified
July 23, 2026
Advisory Details (6)
Auto-updated Jun 15, 2026Mermaid Config Schema | Mermaid
https://mermaid.js.org/config/schema-docs/config.html#securitylevelv10.9.6
Patch available: mermaid-js/mermaid v10.9.6
https://github.com/mermaid-js/mermaid/releases/tag/v10.9.6mermaid@11.15.0
Patch available: mermaid-js/mermaid mermaid@11.15.0
https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0commit e9b0f34d8d82 (mermaid-js/mermaid)
Patch available: mermaid-js/mermaid mermaid@11.15.0 (contains commit e9b0f34d8d82)
https://github.com/mermaid-js/mermaid/commit/e9b0f34d8d82a6260077764ee45e1d7d90957a0fcommit 8fead23c5916 (mermaid-js/mermaid)
Patch available: mermaid-js/mermaid v10.9.6 (contains commit 8fead23c5916)
https://github.com/mermaid-js/mermaid/commit/8fead23c59166b7bab6a39eac81acebee2859102Improper sanitization of `classDefs` in diagrams leads to CSS injection · Advisory · mermaid-js/mermaid · GitHub
https://github.com/mermaid-js/mermaid/security/advisories/GHSA-xcj9-5m2h-648rVendor Advisories for CVE-2026-41148(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Patch Availability(2)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| npm | mermaid @ 11.15.0 (fixes >= 11.0.0-alpha.1, <= 11.14.0) | — | ghsa |
| npm | mermaid @ 10.9.6 (fixes <= 10.9.5) | — | ghsa |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(3 across 3 ecosystems)
Debian:11(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| node-mermaid | 8.11.0+ds+~cs29.13.22-1 ... 9.2.2+~2.0.0-2 (15 versions) |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| node-mermaid | 8.11.0+ds+~cs29.13.22-1 ... 9.2.2+~2.0.0-2 (16 versions) |
| — |
npm(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| mermaid | — |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 10× in last 7d / 40× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 100 of 203 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 103 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-11-01 07:51 UTCGHSA enrichmentGHSA-xcj9-5m2h-648r · GitHub severity MODERATE
- 2026-11-01 07:51 UTCEG score recompute
- 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-10-30 18:25 UTCOSV refresh
- 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-10-25 14:30 UTCEG score recompute
- 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-23 02:23 UTCEG score recompute
- 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-18 03:42 UTCEG score recompute
- 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
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- 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-12 16:08 UTCEG score recompute
- 2026-10-11 19:51 UTCEG score recompute
- 2026-10-11 17:04 UTCEG score recompute
- 2026-10-11 14:30 UTCEG score recompute
- 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 47th percentile
- 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-09-30 02:39 UTCOSV refresh
- 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.6% · 46th percentile
- 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 27th percentile
- 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-11 03:53 UTCOSV refresh
- 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-23 16:39 UTCEG score recompute
- 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-21 21:40 UTCEG score recompute
- 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-20 18:38 UTCEG score recompute
- 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-17 09:43 UTCEG score recompute
- 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-16 03:18 UTCEG score recompute
- 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-14 01:51 UTCEG score recompute
- 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-12 21:38 UTCEG score recompute
- 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-11 23:03 UTCEG score recompute
- 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-11 00:28 UTCEG score recompute
- 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-09 23:54 UTCEG score recompute
- 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-09 01:20 UTCEG score recompute
- 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-07 18:20 UTCEG score recompute
- 2026-08-06 19:45 UTCEG score recompute
- 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.3% · 26th percentile
- 2026-08-05 21:10 UTCEG score recompute
Related CVEs(same product + same CWE)
Same product
10 shownDebian:11:node-mermaid
Frequently asked(5)
What is CVE-2026-41148?
When was the CVE record for CVE-2026-41148 published?
Is CVE-2026-41148 actively exploited?
What is the CVSS score of CVE-2026-41148?
How do I remediate CVE-2026-41148?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-41148
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