CVE-2026-41159

MEDIUMNVD 5.35.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.5% (44th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
5.3EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Prior to 10.9.6 and 11.15.0, Mermaid's default configuration allows injecting CSS that applies outside of the Mermaid diagram via the fontFamily, themeCSS, and altFontFamily configuration options. The injected CSS exploits stylis's & (scope reference) handling. :not(&) escapes the #mermaid-xxx automatic scoping, applying styles to all page elements. Global at-rules (@font-face, @keyframes, @counter-style) are also injectable as stylis hoists them to top level. This allows page defacement and DOM attribute exfiltration via CSS :has() selectors. This vulnerability is fixed in 10.9.6 and 11.15.0.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity53% × 45%
The EG Score, 5.3 of 10.
Exploitation0.5% × 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
0.5%
EPSS %ILE
44th
KEV
Not listed

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.

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 29, 2026

Last Modified

July 21, 2026

Advisory Details (3)

Auto-updated Jun 15, 2026
Patch available. Sources: github_release, github.
GitHub advisoryMentions a patch (unverified)

Improper sanitization of configuration leads to CSS injection · Advisory · mermaid-js/mermaid · GitHub

https://github.com/mermaid-js/mermaid/security/advisories/GHSA-87f9-hvmw-gh4p
GitHub release Patch Available

v10.9.6

Patch available: mermaid-js/mermaid v10.9.6

https://github.com/mermaid-js/mermaid/releases/tag/v10.9.6
GitHub release Patch Available

[email protected]

Patch available: mermaid-js/mermaid [email protected]

https://github.com/mermaid-js/mermaid/releases/tag/[email protected]

Vendor Advisories for CVE-2026-41159(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(3 across 3 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
node-mermaid8.11.0+ds+~cs29.13.22-1 ... 9.2.2+~2.0.0-2 (15 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
node-mermaid8.11.0+ds+~cs29.13.22-1 ... 9.2.2+~2.0.0-2 (16 versions)
  • every version on: no fix on record
—
npm(1)
PackageVulnerable rangeFix by version rangeDependents
mermaid—
  • 11.0.0-alpha.1 up to 11.15.0: fixed in 11.15.0
  • every version up to 10.9.6: fixed in 10.9.6
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 11× in last 7d / 27× 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 99 of 172 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. 1 repeat row among the latest 100 is merged into the row it repeats. The 73 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  2. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  3. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  4. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  5. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  6. 2026-10-12 16:08 UTCEG score recompute
  7. 2026-10-11 19:51 UTCEG score recompute
  8. 2026-10-11 17:04 UTCEG score recompute
  9. 2026-10-11 14:30 UTCEG score recompute
  10. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  11. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  12. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  13. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  14. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  15. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  16. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  17. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  18. 2026-10-03 14:48 UTCOSV refresh
  19. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 44th percentile
  20. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  21. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  22. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  23. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  24. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  25. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.5% · 40th percentile
Show 74 more
  1. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  3. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  4. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  5. 2026-09-14 06:27 UTCEG score recompute
  6. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  7. 2026-09-13 02:09 UTCOSV refresh
  8. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  9. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  11. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  12. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  13. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  14. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  17. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  18. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  19. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  20. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  21. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  22. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  23. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  24. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  25. 2026-08-25 04:27 UTCEG score recompute
  26. 2026-08-23 14:14 UTCEG score recompute
  27. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  28. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  29. 2026-08-21 15:12 UTCEG score recompute
  30. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  31. 2026-08-20 10:28 UTCEG score recompute
  32. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  33. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  34. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  35. 2026-08-17 06:54 UTCEG score recompute
  36. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  37. 2026-08-16 02:25 UTCEG score recompute
  38. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  39. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  40. 2026-08-14 00:36 UTCEG score recompute
  41. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  42. 2026-08-12 21:38 UTCEG score recompute
  43. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  44. 2026-08-11 22:52 UTCEG score recompute
  45. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  46. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  47. 2026-08-09 17:11 UTCEG score recompute
  48. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  49. 2026-08-08 18:24 UTCEG score recompute
  50. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  51. 2026-08-07 19:36 UTCEG score recompute
  52. 2026-08-06 20:49 UTCEG score recompute
  53. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  54. 2026-08-05 22:02 UTCEG score recompute
  55. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  56. 2026-08-04 23:15 UTCEG score recompute
  57. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  58. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  59. 2026-08-03 15:57 UTCEG score recompute
  60. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  61. 2026-08-01 14:04 UTCEG score recompute
  62. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  63. 2026-07-31 05:54 UTCEG score recompute
  64. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  65. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  66. 2026-07-29 12:02 UTCEG score recompute
  67. 2026-07-28 15:36 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  68. 2026-07-27 14:13 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  69. 2026-07-27 09:12 UTCEG score recompute
  70. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  71. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  72. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  73. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.4% · 32nd percentile
  74. 2026-07-23 03:11 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-41159?
CVE-2026-41159 is a medium-severity vulnerability; its CVE record was published on May 29, 2026. Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Prior to 10.9.6 and 11.15.0, Mermaid's default configuration allows injecting CSS that applies outside of the Mermaid diagram via the fontFamily, themeCSS, and altFontFamily configuration…
When was the CVE record for CVE-2026-41159 published?
The CVE record for CVE-2026-41159 was published on May 29, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of July 21, 2026; the record at its source may have been updated since.
Is CVE-2026-41159 actively exploited?
CVE-2026-41159 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (44th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-41159?
CVE-2026-41159 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-41159?
A fix for CVE-2026-41159 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-41159 are linked in the Vendor Advisories panel on this page.

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