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: 0.9%CVSS: 9.8Exploit: None knownExposed services: Not assessed

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
9.8CRITICALmedium confidence
EG Risk
44
EG Risk 44/100

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
Severity98% × 45%
Exploitation1% × 40%
Automatability0% × 15%
EPSS PROB
0.9%
EPSS %ILE
59th
KEV
Not listed

Published

March 7, 2026

Last Modified

July 15, 2026

Advisory Details (6)

Auto-updated Oct 3, 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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
@backstage/plugin-techdocs-node—
  • every version up to 1.14.3: fixed in 1.14.3
—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 5× in last 7d / 23× 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 149 total refreshes for this CVE.

  1. 2026-10-05 17:42 UTCEPSS rescore
  2. 2026-10-04 23:21 UTCEPSS rescore
  3. 2026-10-03 14:25 UTCEPSS rescore
  4. 2026-10-01 19:49 UTCEPSS rescore
  5. 2026-09-30 15:03 UTCEPSS rescore
  6. 2026-09-28 13:51 UTCEPSS rescore
  7. 2026-09-26 15:58 UTCEPSS rescore
  8. 2026-09-26 00:26 UTCEPSS rescore
  9. 2026-09-20 20:15 UTCEPSS rescore
  10. 2026-09-20 20:15 UTCEPSS rescore
  11. 2026-09-18 19:28 UTCEPSS rescore
  12. 2026-09-18 19:27 UTCEPSS rescore
  13. 2026-09-17 19:30 UTCEPSS rescore
  14. 2026-09-16 14:08 UTCEPSS rescore
  15. 2026-09-16 05:15 UTCEPSS rescore
  16. 2026-09-13 16:47 UTCEPSS rescore
  17. 2026-09-12 15:01 UTCEPSS rescore
  18. 2026-09-11 14:52 UTCEPSS rescore
  19. 2026-09-10 09:34 UTCEPSS rescore
  20. 2026-09-08 22:00 UTCEPSS rescore
  21. 2026-09-07 16:01 UTCEPSS rescore
  22. 2026-09-06 13:47 UTCEPSS rescore
  23. 2026-09-06 13:47 UTCEPSS rescore
  24. 2026-09-04 05:06 UTCEPSS rescore
  25. 2026-09-02 14:11 UTCEPSS rescore
Show 75 more
  1. 2026-09-01 13:53 UTCEPSS rescore
  2. 2026-09-01 04:39 UTCEPSS rescore
  3. 2026-09-01 04:39 UTCEPSS rescore
  4. 2026-08-30 19:17 UTCEPSS rescore
  5. 2026-08-30 01:22 UTCEPSS rescore
  6. 2026-08-28 21:41 UTCEPSS rescore
  7. 2026-08-27 14:25 UTCEPSS rescore
  8. 2026-08-26 14:46 UTCEPSS rescore
  9. 2026-08-25 13:49 UTCEPSS rescore
  10. 2026-08-24 14:17 UTCEPSS rescore
  11. 2026-08-23 00:19 UTCEPSS rescore
  12. 2026-08-21 23:49 UTCEPSS rescore
  13. 2026-08-20 22:55 UTCEPSS rescore
  14. 2026-08-20 22:55 UTCEPSS rescore
  15. 2026-08-19 17:03 UTCEPSS rescore
  16. 2026-08-18 13:48 UTCEPSS rescore
  17. 2026-08-17 13:47 UTCEPSS rescore
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 12:18 UTCEG score recompute
  20. 2026-08-16 12:18 UTCVendor advisory
  21. 2026-08-16 02:14 UTCEPSS rescore
  22. 2026-08-15 01:30 UTCEPSS rescore
  23. 2026-08-15 00:43 UTCVendor advisory
  24. 2026-08-14 20:43 UTCVendor advisory
  25. 2026-08-14 16:13 UTCVendor advisory
  26. 2026-08-14 12:12 UTCVendor advisory
  27. 2026-08-14 08:13 UTCEG score recompute
  28. 2026-08-14 08:13 UTCVendor advisory
  29. 2026-08-13 22:00 UTCEPSS rescore
  30. 2026-08-13 03:42 UTCVendor advisory
  31. 2026-08-12 23:43 UTCEG score recompute
  32. 2026-08-12 23:43 UTCVendor advisory
  33. 2026-08-12 13:50 UTCEPSS rescore
  34. 2026-08-11 22:30 UTCEG score recompute
  35. 2026-08-11 22:30 UTCVendor advisory
  36. 2026-08-11 13:42 UTCEPSS rescore
  37. 2026-08-11 09:20 UTCVendor advisory
  38. 2026-08-11 05:20 UTCEG score recompute
  39. 2026-08-11 05:20 UTCVendor advisory
  40. 2026-08-11 00:00 UTCEPSS rescore
  41. 2026-08-10 10:00 UTCVendor advisory
  42. 2026-08-10 06:01 UTCVendor advisory
  43. 2026-08-10 01:36 UTCVendor advisory
  44. 2026-08-09 21:35 UTCVendor advisory
  45. 2026-08-09 17:35 UTCEG score recompute
  46. 2026-08-09 17:35 UTCVendor advisory
  47. 2026-08-09 13:46 UTCEPSS rescore
  48. 2026-08-09 13:32 UTCVendor advisory
  49. 2026-08-09 07:52 UTCEG score recompute
  50. 2026-08-09 07:52 UTCVendor advisory
  51. 2026-08-08 16:37 UTCEPSS rescore
  52. 2026-08-08 11:29 UTCVendor advisory
  53. 2026-08-08 07:18 UTCVendor advisory
  54. 2026-08-08 03:18 UTCVendor advisory
  55. 2026-08-07 23:18 UTCVendor advisory
  56. 2026-08-07 19:18 UTCEG score recompute
  57. 2026-08-07 19:18 UTCVendor advisory
  58. 2026-08-06 20:23 UTCEG score recompute
  59. 2026-08-06 20:23 UTCVendor advisory
  60. 2026-08-06 13:46 UTCEPSS rescore
  61. 2026-08-06 06:21 UTCVendor advisory
  62. 2026-08-06 02:21 UTCEG score recompute
  63. 2026-08-06 02:21 UTCVendor advisory
  64. 2026-08-05 19:17 UTCEPSS rescore
  65. 2026-08-04 15:10 UTCEPSS rescore
  66. 2026-08-04 05:47 UTCVendor advisory
  67. 2026-08-04 01:46 UTCEG score recompute
  68. 2026-08-04 01:46 UTCVendor advisory
  69. 2026-08-03 10:36 UTCEPSS rescore
  70. 2026-08-03 02:34 UTCVendor advisory
  71. 2026-08-02 22:34 UTCVendor advisory
  72. 2026-08-02 18:33 UTCEG score recompute
  73. 2026-08-02 18:33 UTCVendor advisory
  74. 2026-08-02 02:26 UTCEPSS rescore
  75. 2026-08-01 04:16 UTCEPSS rescore

Related CVEs(same product + same vendor + same CWE)

Same product

2 shown

npm:@backstage/plugin-techdocs-node

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 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 0.9% probability of exploitation in the next 30 days (59th percentile of EPSS-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?
A fix for CVE-2026-29186 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-29186 are linked in the Vendor Advisories panel on this page.

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