Vulnerability-Lookup

RHSA-2026:86957

Vulnerability from csaf_redhat - Published: 2026-10-21 12:28 - Updated: 2026-10-26 17:03

Summary

Red Hat Security Advisory: Red Hat Developer Hub 1.10.6 Plugin Catalog GA plugins release.

Severity

Important

Notes

Topic: Red Hat Developer Hub 1.10.6 Plugin Catalog GA plugins release.

Details: Red Hat Developer Hub (RHDH) is extensible by the plugins included herein.

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.

CVE-2026-90711

A flaw was found in proxy-addr. When an application defines trusted proxy subnets using IPv4-mapped IPv6 addresses with an improper prefix length, the subnet parser fails open and erroneously treats all incoming network addresses as trusted. A remote, unauthenticated attacker can exploit this vulnerability by submitting a forged X-Forwarded-For header to spoof their client IP address. This flaw allows attackers to bypass IP-based access controls, rate limiting, and audit logging.

7.5 (High)


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

CWE-290 - Authentication Bypass by Spoofing

Affected products

Fixed 4 products

Product	Version	Remediation
Unresolved product id: Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-lightspeed-backend@sha256:fd810ebe5995c4f8d211e145f40ff5f0c327506d598509a50a10a4b9728ca8df_amd64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend-module-loki@sha256:2bb6a1ac12de81b8b14c21a73ed1efcac20e386d9dd87db5a309905fbf221340_amd64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend@sha256:1757e2d71a48707d556308d31e84f6fd3d4ae36021c9321c0634c9af7290cbd5_amd64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-scaffolder-backend-module-orchestrator@sha256:03739daac49291136955c7129296c7e4f5769c7be904a4a5c0286663d5a02cda_amd64	—	Vendor Fix fix Workaround

Known not affected 3 products

Product	Version	Remediation
Unresolved product id: Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-lightspeed@sha256:880fe5dc9874f8f12610e3b58fc7c8f288d5c5b04d4849c3465adb733ebe9444_amd64	—	Workaround
Unresolved product id: Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-form-widgets@sha256:bf3335d76864d1a2c069be1cad91d74183ff4ffc1846eca4073b06e09808928a_amd64	—	Workaround
Unresolved product id: Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator@sha256:c43d654e0194e7bf5b82e6026b6f16dec9cdc3a18852c2c34090cbdb82f447fc_amd64	—	Workaround

Threats

Impact Important

References

17 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:86957	self
https://access.redhat.com/security/cve/CVE-2026-90711	external
https://access.redhat.com/security/updates/classi…	external
https://catalog.redhat.com/search?gs&searchType=c…	external
https://developers.redhat.com/rhdh/overview	external
https://docs.redhat.com/en/documentation/red_hat_…	external
https://redhat.atlassian.net/browse/RHIDP-17745	external
https://redhat.atlassian.net/browse/RHIDP-17746	external
https://redhat.atlassian.net/browse/RHIDP-17747	external
https://redhat.atlassian.net/browse/RHIDP-17748	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-90711	self
https://bugzilla.redhat.com/show_bug.cgi?id=2533602	external
https://www.cve.org/CVERecord?id=CVE-2026-90711	external
https://nvd.nist.gov/vuln/detail/CVE-2026-90711	external
https://cna.openjsf.org/security-advisories.html	external
https://github.com/jshttp/proxy-addr/security/adv…	external

JSON

To clipboard

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        "relates_to_product_reference": "Red Hat Developer Hub 1.10"
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  "vulnerabilities": [
    {
      "cve": "CVE-2026-90711",
      "cwe": {
        "id": "CWE-290",
        "name": "Authentication Bypass by Spoofing"
      },
      "discovery_date": "2026-09-15T06:41:11.029083+00:00",
      "flags": [
        {
          "label": "vulnerable_code_not_present",
          "product_ids": [
            "Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-lightspeed@sha256:880fe5dc9874f8f12610e3b58fc7c8f288d5c5b04d4849c3465adb733ebe9444_amd64",
            "Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-form-widgets@sha256:bf3335d76864d1a2c069be1cad91d74183ff4ffc1846eca4073b06e09808928a_amd64",
            "Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator@sha256:c43d654e0194e7bf5b82e6026b6f16dec9cdc3a18852c2c34090cbdb82f447fc_amd64"
          ]
        }
      ],
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2533602"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in proxy-addr. When an application defines trusted proxy subnets using IPv4-mapped IPv6 addresses with an improper prefix length, the subnet parser fails open and erroneously treats all incoming network addresses as trusted. A remote, unauthenticated attacker can exploit this vulnerability by submitting a forged X-Forwarded-For header to spoof their client IP address. This flaw allows attackers to bypass IP-based access controls, rate limiting, and audit logging.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "proxy-addr: proxy-addr vulnerable to IP spoofing via IPv4-mapped IPv6 trust subnet",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability is rated as Important because unauthenticated remote attackers can spoof client IP addresses and circumvent security controls, such as rate limits or network access lists, by sending custom forwarding headers. Exploitation is contingent on application configurations that define reverse proxy trust subnets using IPv4-mapped IPv6 notation with short IPv4 prefix lengths. Environments configuring trusted proxies via canonical IPv4 CIDR blocks, hostnames, or default loopback addresses are not vulnerable to this behavior.",
          "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 Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-lightspeed-backend@sha256:fd810ebe5995c4f8d211e145f40ff5f0c327506d598509a50a10a4b9728ca8df_amd64",
          "Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend-module-loki@sha256:2bb6a1ac12de81b8b14c21a73ed1efcac20e386d9dd87db5a309905fbf221340_amd64",
          "Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend@sha256:1757e2d71a48707d556308d31e84f6fd3d4ae36021c9321c0634c9af7290cbd5_amd64",
          "Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-scaffolder-backend-module-orchestrator@sha256:03739daac49291136955c7129296c7e4f5769c7be904a4a5c0286663d5a02cda_amd64"
        ],
        "known_not_affected": [
          "Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-lightspeed@sha256:880fe5dc9874f8f12610e3b58fc7c8f288d5c5b04d4849c3465adb733ebe9444_amd64",
          "Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-form-widgets@sha256:bf3335d76864d1a2c069be1cad91d74183ff4ffc1846eca4073b06e09808928a_amd64",
          "Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator@sha256:c43d654e0194e7bf5b82e6026b6f16dec9cdc3a18852c2c34090cbdb82f447fc_amd64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-90711"
        },
        {
          "category": "external",
          "summary": "RHBZ#2533602",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2533602"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-90711",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-90711"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-90711",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90711"
        },
        {
          "category": "external",
          "summary": "https://cna.openjsf.org/security-advisories.html",
          "url": "https://cna.openjsf.org/security-advisories.html"
        },
        {
          "category": "external",
          "summary": "https://github.com/jshttp/proxy-addr/security/advisories/GHSA-jqcg-44mw-7w3h",
          "url": "https://github.com/jshttp/proxy-addr/security/advisories/GHSA-jqcg-44mw-7w3h"
        }
      ],
      "release_date": "2026-09-15T06:19:46.332000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-21T12:28:39+00:00",
          "details": "For more about Red Hat Developer Hub, see References links",
          "product_ids": [
            "Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-lightspeed-backend@sha256:fd810ebe5995c4f8d211e145f40ff5f0c327506d598509a50a10a4b9728ca8df_amd64",
            "Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend-module-loki@sha256:2bb6a1ac12de81b8b14c21a73ed1efcac20e386d9dd87db5a309905fbf221340_amd64",
            "Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend@sha256:1757e2d71a48707d556308d31e84f6fd3d4ae36021c9321c0634c9af7290cbd5_amd64",
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          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:86957"
        },
        {
          "category": "workaround",
          "details": "To mitigate this flaw through configuration:\n\n1. Configure trusted proxy definitions using standard IPv4 notation (such as `10.0.0.0/8`) rather than IPv4-mapped IPv6 notation.\n2. If IPv4-mapped IPv6 notation is required, set the subnet prefix length to at least 97 to cover the mapped boundary (for example, specify `::ffff:10.0.0.0/104` instead of `::ffff:10.0.0.0/8`).\n3. Alternatively, sanitize or strip incoming `X-Forwarded-For` headers at edge load balancers or boundary reverse proxies before passing traffic to backend applications.\n\nWarning: Modifying application configuration files requires restarting the Node.js application service, which will temporarily interrupt service availability and active connections.",
          "product_ids": [
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            "Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-lightspeed@sha256:880fe5dc9874f8f12610e3b58fc7c8f288d5c5b04d4849c3465adb733ebe9444_amd64",
            "Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend-module-loki@sha256:2bb6a1ac12de81b8b14c21a73ed1efcac20e386d9dd87db5a309905fbf221340_amd64",
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          ]
        }
      ],
      "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"
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            "Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-backend-module-loki@sha256:2bb6a1ac12de81b8b14c21a73ed1efcac20e386d9dd87db5a309905fbf221340_amd64",
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            "Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-orchestrator-form-widgets@sha256:bf3335d76864d1a2c069be1cad91d74183ff4ffc1846eca4073b06e09808928a_amd64",
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            "Red Hat Developer Hub 1.10:registry.redhat.io/rhdh/red-hat-developer-hub-backstage-plugin-scaffolder-backend-module-orchestrator@sha256:03739daac49291136955c7129296c7e4f5769c7be904a4a5c0286663d5a02cda_amd64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "proxy-addr: proxy-addr vulnerable to IP spoofing via IPv4-mapped IPv6 trust subnet"
    }
  ]
}

CVE-2026-90711 (GCVE-0-2026-90711)

Vulnerability from cvelistv5 – Published: 2026-09-15 06:19 – Updated: 2026-09-15 14:48

Title

proxy-addr vulnerable to IP spoofing via IPv4-mapped IPv6 trust subnet

Summary

proxy-addr is a Node.js module that determines a request's client address behind trusted reverse proxies, and it backs Express req.ip and req.ips. In versions 1.1.0 through 2.0.7, a trust subnet written in IPv4-mapped IPv6 notation with an IPv4-sized prefix, such as ::ffff:10.0.0.0/8 instead of the correct ::ffff:10.0.0.0/104, is accepted without error but trusts every IPv4 address on the internet rather than the block it names. Because the socket peer then becomes trusted at hop 0, any unauthenticated client can supply an arbitrary X-Forwarded-For header and control the address the application reads, which defeats IP-based access control, rate limiting, geolocation, and audit logging. This is a fail-open regression introduced in version 1.1.0. The issue is fixed in proxy-addr 2.0.8, and users should upgrade to 2.0.8 or later. As a workaround, ensure any IPv4-mapped IPv6 trust subnet uses a prefix length of at least 97, or express the range in plain IPv4 notation.

Severity

9.1 (Critical)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 14:46 UTC

CWE

CWE-290 - Authentication Bypass by Spoofing
CWE-348 - Use of Less Trusted Source
CWE-697 - Incorrect Comparison

Assigner

openjs CNA under the redhat root

CNA scorecard C 65/100 over 121 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/jshttp/proxy-addr/security/adv…
https://cna.openjsf.org/security-advisories.html

Impacted products

1 product

Vendor	Product	Version
proxy-addr	proxy-addr	Affected: 1.1.0 , < 2.0.8 (semver) Unaffected: 2.0.8 (semver)

Credits

kagebunsher UlisesGascon kustundag

Show details on NVD website

JSON

To clipboard

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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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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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