CVE-2026-29186

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.8%, top 47% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

Backstage is an open framework for building developer portals. Prior to version 1.14.3, this is a configuration bypass vulnerability that enables arbitrary code execution. The @backstage/plugin-techdocs-node package uses an allowlist to filter dangerous MkDocs configuration keys during the documentation build process. A gap in this allowlist allows attackers to craft an mkdocs.yml that causes arbitrary Python code execution, completely bypassing TechDocs' security controls. This issue has been patched in version 1.14.3.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: Track

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
Severity98% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
54%
KEV
Not listed

Published

March 7, 2026

Last Modified

July 15, 2026

Advisory Details (6)

Auto-updated Sep 12, 2026
Patch available. Sources: github, redhat.
redhat Patch Available
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29186.json
redhat

2445480 – (CVE-2026-29186) CVE-2026-29186 backstage/plugin-techdocs-node: TechDocs Mkdocs configuration key enables arbitrary code execution

https://bugzilla.redhat.com/show_bug.cgi?id=2445480
redhat Patch Available

CVE-2026-29186 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-29186
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:9742
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:13826
github Patch Available

TechDocs Mkdocs Configuration Key Enables Arbitrary Code Execution · Advisory · backstage/backstage · GitHub

https://github.com/backstage/backstage/security/advisories/GHSA-928r-fm4v-mvrw

Vendor Advisories for CVE-2026-29186(2)

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 / EcosystemFixed in / PatchReleasedSource
redhatrhdh/rhdh-hub-rhel9:17779032622026-05-05redhat
redhatrhdh/rhdh-hub-rhel9:17767842862026-04-22redhat

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

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
@backstage/plugin-techdocs-node—1.14.3—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 29× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 139 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 19:27 UTCEPSS rescore
  3. 2026-09-17 19:30 UTCEPSS rescore
  4. 2026-09-16 14:08 UTCEPSS rescore
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  6. 2026-09-13 16:47 UTCEPSS rescore
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  8. 2026-09-11 14:52 UTCEPSS rescore
  9. 2026-09-10 09:34 UTCEPSS rescore
  10. 2026-09-08 22:00 UTCEPSS rescore
  11. 2026-09-07 16:01 UTCEPSS rescore
  12. 2026-09-06 13:47 UTCEPSS rescore
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  14. 2026-09-04 05:06 UTCEPSS rescore
  15. 2026-09-02 14:11 UTCEPSS rescore
  16. 2026-09-01 13:53 UTCEPSS rescore
  17. 2026-09-01 04:39 UTCEPSS rescore
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  19. 2026-08-30 19:17 UTCEPSS rescore
  20. 2026-08-30 01:22 UTCEPSS rescore
  21. 2026-08-28 21:41 UTCEPSS rescore
  22. 2026-08-27 14:25 UTCEPSS rescore
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  24. 2026-08-25 13:49 UTCEPSS rescore
  25. 2026-08-24 14:17 UTCEPSS rescore
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  1. 2026-08-23 00:19 UTCEPSS rescore
  2. 2026-08-21 23:49 UTCEPSS rescore
  3. 2026-08-20 22:55 UTCEPSS rescore
  4. 2026-08-20 22:55 UTCEPSS rescore
  5. 2026-08-19 17:03 UTCEPSS rescore
  6. 2026-08-18 13:48 UTCEPSS rescore
  7. 2026-08-17 13:47 UTCEPSS rescore
  8. 2026-08-16 14:56 UTCEPSS rescore
  9. 2026-08-16 12:18 UTCEG score recompute
  10. 2026-08-16 12:18 UTCVendor advisory
  11. 2026-08-16 02:14 UTCEPSS rescore
  12. 2026-08-15 01:30 UTCEPSS rescore
  13. 2026-08-15 00:43 UTCVendor advisory
  14. 2026-08-14 20:43 UTCVendor advisory
  15. 2026-08-14 16:13 UTCVendor advisory
  16. 2026-08-14 12:12 UTCVendor advisory
  17. 2026-08-14 08:13 UTCEG score recompute
  18. 2026-08-14 08:13 UTCVendor advisory
  19. 2026-08-13 22:00 UTCEPSS rescore
  20. 2026-08-13 03:42 UTCVendor advisory
  21. 2026-08-12 23:43 UTCEG score recompute
  22. 2026-08-12 23:43 UTCVendor advisory
  23. 2026-08-12 13:50 UTCEPSS rescore
  24. 2026-08-11 22:30 UTCEG score recompute
  25. 2026-08-11 22:30 UTCVendor advisory
  26. 2026-08-11 13:42 UTCEPSS rescore
  27. 2026-08-11 09:20 UTCVendor advisory
  28. 2026-08-11 05:20 UTCEG score recompute
  29. 2026-08-11 05:20 UTCVendor advisory
  30. 2026-08-11 00:00 UTCEPSS rescore
  31. 2026-08-10 10:00 UTCVendor advisory
  32. 2026-08-10 06:01 UTCVendor advisory
  33. 2026-08-10 01:36 UTCVendor advisory
  34. 2026-08-09 21:35 UTCVendor advisory
  35. 2026-08-09 17:35 UTCEG score recompute
  36. 2026-08-09 17:35 UTCVendor advisory
  37. 2026-08-09 13:46 UTCEPSS rescore
  38. 2026-08-09 13:32 UTCVendor advisory
  39. 2026-08-09 07:52 UTCEG score recompute
  40. 2026-08-09 07:52 UTCVendor advisory
  41. 2026-08-08 16:37 UTCEPSS rescore
  42. 2026-08-08 11:29 UTCVendor advisory
  43. 2026-08-08 07:18 UTCVendor advisory
  44. 2026-08-08 03:18 UTCVendor advisory
  45. 2026-08-07 23:18 UTCVendor advisory
  46. 2026-08-07 19:18 UTCEG score recompute
  47. 2026-08-07 19:18 UTCVendor advisory
  48. 2026-08-06 20:23 UTCEG score recompute
  49. 2026-08-06 20:23 UTCVendor advisory
  50. 2026-08-06 13:46 UTCEPSS rescore
  51. 2026-08-06 06:21 UTCVendor advisory
  52. 2026-08-06 02:21 UTCEG score recompute
  53. 2026-08-06 02:21 UTCVendor advisory
  54. 2026-08-05 19:17 UTCEPSS rescore
  55. 2026-08-04 15:10 UTCEPSS rescore
  56. 2026-08-04 05:47 UTCVendor advisory
  57. 2026-08-04 01:46 UTCEG score recompute
  58. 2026-08-04 01:46 UTCVendor advisory
  59. 2026-08-03 10:36 UTCEPSS rescore
  60. 2026-08-03 02:34 UTCVendor advisory
  61. 2026-08-02 22:34 UTCVendor advisory
  62. 2026-08-02 18:33 UTCEG score recompute
  63. 2026-08-02 18:33 UTCVendor advisory
  64. 2026-08-02 02:26 UTCEPSS rescore
  65. 2026-08-01 04:16 UTCEPSS rescore
  66. 2026-07-30 16:27 UTCEPSS rescore
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  68. 2026-07-28 15:36 UTCEPSS rescore
  69. 2026-07-26 14:54 UTCEPSS rescore
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  71. 2026-07-25 14:18 UTCEPSS rescore
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  73. 2026-07-24 14:17 UTCEPSS rescore
  74. 2026-07-23 14:18 UTCEPSS rescore
  75. 2026-07-23 14:18 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-29186?
CVE-2026-29186 is a critical vulnerability published on March 7, 2026. Backstage is an open framework for building developer portals. Prior to version 1.14.3, this is a configuration bypass vulnerability that enables arbitrary code execution. The @backstage/plugin-techdocs-node package uses an allowlist to filter dangerous MkDocs configuration keys during the…
When was CVE-2026-29186 disclosed?
CVE-2026-29186 was first published in the National Vulnerability Database on March 7, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-29186 actively exploited?
CVE-2026-29186 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 45.6% of all scored CVEs.
What is the CVSS score of CVE-2026-29186?
CVE-2026-29186 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-29186?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-29186, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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