Skip to content
OpenAdvisories
High ALSA-2026:71543 4 CVEs

Important: cockpit-image-builder security update

Published Sep 24, 2026 · Updated Oct 29, 2026

Ecosystem: AlmaLinux

Summary

The image-builder-frontend generates custom images suitable for deploying systems or uploading to the cloud. It integrates into Cockpit as a frontend for osbuild.

Security Fix(es):

* fast-uri: fast-uri: Server-Side Request Forgery via repeated hostname percent-decoding (CVE-2026-75899)
* fast-uri: fast-uri: Server-side request forgery via malformed IPv6 normalization (CVE-2026-75975)
* fast-uri: fast-uri: URI parsing flaw enables server-side request forgery and redirects (CVE-2026-76172)
* fast-uri: fast-uri: Authority Injection via Unvalidated Port Serialization (CVE-2026-84292)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Fixed packages 1

ReleasePackageFixed in
AlmaLinux · 10 cockpit-image-builder 94.4-1.el10_2

Vulnerabilities 4

  • High 7.5
    CVE-2026-75899

    fast-uri vulnerable to server-side request forgery via repeated hostname percent-decoding

    fast-uri is a URI parser for Node.js. It decodes percent escapes in a hostname during parsing and then decodes the parsed hostname a second time during authority recomposition, so a single call to normalize or resolve can turn nested percent-encoded input int…

    fast-uri fast-uri prism opensearch-dashboards-3 Debian Ubuntu Wolfi npm
  • High 7.5
    CVE-2026-75975

    fast-uri vulnerable to server-side request forgery via malformed IPv6 normalization

    fast-uri is a URI parser for Node.js. Its custom parser for bracketed IPv6 literals does not validate the complete IPv6 grammar, so invalid trailing text in an authority can be silently discarded and a malformed attacker-controlled host is turned into a diffe…

    fast-uri fast-uri prism opensearch-dashboards-3 Debian Ubuntu Wolfi npm
  • High 7.5
    CVE-2026-76172

    fast-uri vulnerable to host confusion via percent-encoded scheme normalization

    fast-uri is a URI parser for Node.js. During parsing it runs a legacy decoding pass over the scheme component and never re-escapes the result, and serialization writes the scheme back out verbatim, unlike the host component which is re-escaped. As a result an…

    fast-uri fast-uri prism opensearch-dashboards-3 Debian Ubuntu Wolfi npm
  • High 7.5
    CVE-2026-84292

    fast-uri vulnerable to authority injection via an unvalidated port in serialize

    fast-uri serializes the port component of a URI without validating it. When recomposing the authority, the userinfo and host components are escaped but the port is concatenated verbatim, so a port value that is not a sequence of digits can inject authority de…

    fast-uri fast-uri renovate prism Debian Ubuntu Wolfi npm

References

  • report
    https://access.redhat.com/security/cve/CVE-2026-75899
  • report
    https://access.redhat.com/security/cve/CVE-2026-75975
  • report
    https://access.redhat.com/security/cve/CVE-2026-76172
  • report
    https://access.redhat.com/security/cve/CVE-2026-84292
  • report
    https://bugzilla.redhat.com/2521778
  • report
    https://bugzilla.redhat.com/2521779
  • report
    https://bugzilla.redhat.com/2521798
  • report
    https://bugzilla.redhat.com/2527747
  • advisory
    https://errata.almalinux.org/10/ALSA-2026-71543.html