CVE & CISA-KEV Catalog

CVE-2026-29186

HIGH
7.7
CVSS v3
NVD

Description

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.

CWE-74InjectionCWE-434Unrestricted File UploadCWE-791

How to fix

Remediation Available
registry.redhat.io/rhdh/rhdhRed Hat / RHEL
Fixed in:hub-rhel9@sha256:bb763e2b7a9d101f73b03b9e1c5688e7034fd9d31413e890817bd4098a7d42f9_amd64RHSA-2026:9742
Fixed in:rhel9-operator@sha256:f09d63af77eec6b131067a08b1bd3a8c7673f9e68325bfde1ae081f85d73598c_amd64RHSA-2026:9742
Fixed in:operator-bundle@sha256:b40f228ed49b81e675763d0bb1e38e7a45c45eef8003237abfbddbfb952bb331_amd64RHSA-2026:9742
Fixed in:hub-rhel9@sha256:80453720616cee369e9f79863ef1815a2741afdeb25d3572085d11ad54afa9a0_amd64RHSA-2026:13826
Fixed in:rhel9-operator@sha256:7118207df52574eb4eb9a6b35aa23eef8029937c2ace807b5e132bcc5188a972_amd64RHSA-2026:13826
Fixed in:operator-bundle@sha256:47c3fc5bfb21e980f0fa6c510c48c97982649c7f27d9d486a19391c56c9531ff_amd64RHSA-2026:13826
registry.redhat.io/rhdh/rhdhRocky
Fixed in:hub-rhel9@sha256:bb763e2b7a9d101f73b03b9e1c5688e7034fd9d31413e890817bd4098a7d42f9_amd64RHSA-2026:9742
Fixed in:rhel9-operator@sha256:f09d63af77eec6b131067a08b1bd3a8c7673f9e68325bfde1ae081f85d73598c_amd64RHSA-2026:9742
Fixed in:operator-bundle@sha256:b40f228ed49b81e675763d0bb1e38e7a45c45eef8003237abfbddbfb952bb331_amd64RHSA-2026:9742
Fixed in:hub-rhel9@sha256:80453720616cee369e9f79863ef1815a2741afdeb25d3572085d11ad54afa9a0_amd64RHSA-2026:13826
Fixed in:rhel9-operator@sha256:7118207df52574eb4eb9a6b35aa23eef8029937c2ace807b5e132bcc5188a972_amd64RHSA-2026:13826
Fixed in:operator-bundle@sha256:47c3fc5bfb21e980f0fa6c510c48c97982649c7f27d9d486a19391c56c9531ff_amd64RHSA-2026:13826

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredLow
User InteractionNone
ScopeChanged

Impact

ConfidentialityHigh
IntegrityLow
AvailabilityLow

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L

Exploit Intelligence

0.78%probability of exploitation in 30 days
54thpercentile

Moderate risk: more likely to be exploited than 54% of all known CVEs.

References

Vendor Advisory1

Related Vulnerabilities

Other CWE-74 (Injection) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2013-2251Critical9.8100%KEVFix
CVE-2023-22527Critical9.8100%KEV + RansomFix
CVE-2019-2725Critical9.8100%KEV + RansomFix
CVE-2022-46169Critical9.8100%KEVFix
CVE-2022-35914Critical9.8100%KEV-
CVE-2019-17558High7.599%KEVFix

Common questions

How do I fix CVE-2026-29186?

Published advisories record a fix for 2 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-29186 being actively exploited?

Not that we know of. CVE-2026-29186 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.78% is the estimated probability that it will be exploited in the next 30 days. That is higher than 54% of all scored CVEs.

How severe is CVE-2026-29186?

CVE-2026-29186 has a CVSS v3 base score of 7.7, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-29186 affect?

Published advisories record a fix for registry.redhat.io/rhdh/rhdh (Red Hat / RHEL), registry.redhat.io/rhdh/rhdh (Rocky). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-15.