RHSA-2026:74633

Vulnerability from csaf_redhat - Published: 2026-10-01 20:11 - Updated: 2026-10-02 17:42
Summary
Red Hat Security Advisory: Technical preview of the satellite/iop-vulnerability-frontend-rhel9 container image
Severity
Important
Notes
Topic: A new satellite/iop-vulnerability-frontend-rhel9 container image is now available as a technical preview in the Red Hat container registry.
Details: Red Hat Lightspeed in Satellite analyzes system health and configuration by applying predefined rules to a small set of local data, such as installed packages, running services, and configuration settings.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

A flaw was found in fast-uri, a URI parser for Node.js. The component incorrectly decodes percent escapes in a hostname twice during URI parsing and authority recomposition. This double decoding can allow a remote attacker to manipulate a URI to point to a different network destination, such as a loopback address. This vulnerability can lead to Server-Side Request Forgery (SSRF) and bypass host-based security policies.

CWE-140 - Improper Neutralization of Delimiters
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Satellite 6.18:registry.redhat.io/satellite/iop-vulnerability-frontend-rhel9@sha256:c21654bddc8120fe9d70db3b7c0b272dc542bf066a5ad5d90b922d993cc16b64_amd64 —
Vendor Fix fix
Workaround
Threats
Impact Important

A flaw was found in fast-uri. This component improperly serializes the port component of a Uniform Resource Identifier (URI) without validating its content. A remote attacker can exploit this by crafting a malicious port value that injects authority delimiters. This manipulation can demote the intended host to user information and redirect the authority to an attacker-controlled host, leading to information disclosure as applications interpret the attacker's host as legitimate.

CWE-140 - Improper Neutralization of Delimiters
Affected products
Fixed 1 product, the same list as for CVE-2026-75899
Threats
Impact Important

A flaw was found in fast-uri. The library incorrectly processes Uniform Resource Identifier (URI) hosts containing unbalanced brackets, leading to a discrepancy in how the host is parsed by fast-uri compared to other HTTP clients. This host confusion can allow an attacker to bypass security policies, such as Server-Side Request Forgery (SSRF) denylists or redirect allowlists, by causing an application to evaluate its policy against an incorrect host string. This could result in unintended network requests or access to unauthorized resources.

CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Affected products
Fixed 1 product, the same list as for CVE-2026-75899
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:74633 self
https://access.redhat.com/documentation/en-us/red… external
https://access.redhat.com/security/cve/CVE-2026-75899 external
https://access.redhat.com/security/cve/CVE-2026-84292 external
https://access.redhat.com/security/cve/CVE-2026-84394 external
https://access.redhat.com/security/updates/classi… external
https://catalog.redhat.com/software/containers/search external
https://docs.redhat.com/en/documentation/red_hat_… external
https://docs.redhat.com/en/documentation/red_hat_… external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2026-75899 self
https://bugzilla.redhat.com/show_bug.cgi?id=2521778 external
https://www.cve.org/CVERecord?id=CVE-2026-75899 external
https://nvd.nist.gov/vuln/detail/CVE-2026-75899 external
https://cna.openjsf.org/security-advisories.html external
https://github.com/fastify/fast-uri/security/advi… external
https://access.redhat.com/security/cve/CVE-2026-84292 self
https://bugzilla.redhat.com/show_bug.cgi?id=2527747 external
https://www.cve.org/CVERecord?id=CVE-2026-84292 external
https://nvd.nist.gov/vuln/detail/CVE-2026-84292 external
https://github.com/fastify/fast-uri/security/advi… external
https://access.redhat.com/security/cve/CVE-2026-84394 self
https://bugzilla.redhat.com/show_bug.cgi?id=2527756 external
https://www.cve.org/CVERecord?id=CVE-2026-84394 external
https://nvd.nist.gov/vuln/detail/CVE-2026-84394 external
https://github.com/fastify/fast-uri/security/advi… external

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        {
          "category": "description",
          "text": "A flaw was found in fast-uri. The library incorrectly processes Uniform Resource Identifier (URI) hosts containing unbalanced brackets, leading to a discrepancy in how the host is parsed by fast-uri compared to other HTTP clients. This host confusion can allow an attacker to bypass security policies, such as Server-Side Request Forgery (SSRF) denylists or redirect allowlists, by causing an application to evaluate its policy against an incorrect host string. This could result in unintended network requests or access to unauthorized resources.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "fast-uri: fast-uri: Host confusion via unbalanced URI brackets can bypass security policies",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability is rated as an Important severity flaw because an unauthenticated remote attacker can exploit URI parsing discrepancies to bypass critical host-level access restrictions, such as SSRF filters or reverse proxy routing, without needing elevated privileges. Within Red Hat environments, the issue primarily impacts services that rely on fast-uri to validate external destinations before dispatching requests via Node.js HTTP clients. Product components that only provide frontend interfaces or do not evaluate host security policies using the parsed authority data are not exposed to security filter circumvention.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "Red Hat Satellite 6.18:registry.redhat.io/satellite/iop-vulnerability-frontend-rhel9@sha256:c21654bddc8120fe9d70db3b7c0b272dc542bf066a5ad5d90b922d993cc16b64_amd64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-84394"
        },
        {
          "category": "external",
          "summary": "RHBZ#2527756",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2527756"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-84394",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-84394"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-84394",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84394"
        },
        {
          "category": "external",
          "summary": "https://cna.openjsf.org/security-advisories.html",
          "url": "https://cna.openjsf.org/security-advisories.html"
        },
        {
          "category": "external",
          "summary": "https://github.com/fastify/fast-uri/security/advisories/GHSA-58mr-gqgx-xq4g",
          "url": "https://github.com/fastify/fast-uri/security/advisories/GHSA-58mr-gqgx-xq4g"
        }
      ],
      "release_date": "2026-09-02T20:25:35.399000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-01T20:11:46+00:00",
          "details": "For Red Hat Lightspeed in Satellite installation see the Red Hat Satellite documentation.",
          "product_ids": [
            "Red Hat Satellite 6.18:registry.redhat.io/satellite/iop-vulnerability-frontend-rhel9@sha256:c21654bddc8120fe9d70db3b7c0b272dc542bf066a5ad5d90b922d993cc16b64_amd64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:74633"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "Red Hat Satellite 6.18:registry.redhat.io/satellite/iop-vulnerability-frontend-rhel9@sha256:c21654bddc8120fe9d70db3b7c0b272dc542bf066a5ad5d90b922d993cc16b64_amd64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "fast-uri: fast-uri: Host confusion via unbalanced URI brackets can bypass security policies"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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