Vulnerability-Lookup

RHSA-2026:73517

Vulnerability from csaf_redhat - Published: 2026-09-29 16:17 - Updated: 2026-10-04 09:56

Summary

Red Hat Security Advisory: Ansible automation portal (Technology Preview)

Severity

Important

Notes

Topic: Updated images are now available for Red Hat Ansible Automation Platform 2.2, which include new features, bug fixes, and enhancements for the Red Hat Ansible Automation Portal Operator.

Details: Red Hat Ansible Automation Platform 2.2 delivers the Automation Portal Operator for managing Ansible Automation Portal deployments on OpenShift. The operator automates installation, configuration, and lifecycle management of the portal via a custom resource.

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-2026-56859

A flaw was found in the `encoding/xml` package of Go. The `DecodeElement` function failed to correctly track recursion depth, which could lead to stack exhaustion. A remote attacker could exploit this vulnerability by providing a specially crafted XML input, resulting in a Denial of Service (DoS) for the affected application.

7.5 (High)


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

CWE-776 - Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

Affected products

Fixed 1 product

Product	Identifier	Version	Remediation
Unresolved product id: Red Hat Ansible Automation Platform 2.2:registry.redhat.io/ansible-automation-platform/automation-portal-rhel9-operator@sha256:e99604a3de742690f246b4cbdac78bc434dca0abdd857b91a010324535f7a2bb_amd64		—	Vendor Fix fix Workaround

Known not affected 1 product

Product	Identifier	Version	Remediation
Unresolved product id: Red Hat Ansible Automation Platform 2.2:registry.redhat.io/ansible-automation-platform/automation-portal-operator-bundle@sha256:b9870b58050f948fe7a9a166043c398fa4aba406c82a04e95eb8443fd7706b35_amd64		—	Workaround

Threats

Impact Important

References

13 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:73517	self
https://access.redhat.com/security/cve/CVE-2026-56859	external
https://access.redhat.com/security/updates/classi…	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-2026-56859	self
https://bugzilla.redhat.com/show_bug.cgi?id=2515840	external
https://www.cve.org/CVERecord?id=CVE-2026-56859	external
https://nvd.nist.gov/vuln/detail/CVE-2026-56859	external
https://go.dev/cl/803320	external
https://go.dev/issue/80481	external
https://groups.google.com/g/golang-announce/c/94p…	external
https://pkg.go.dev/vuln/GO-2026-6088	external

JSON

To clipboard

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      "cve": "CVE-2026-56859",
      "cwe": {
        "id": "CWE-776",
        "name": "Improper Restriction of Recursive Entity References in DTDs (\u0027XML Entity Expansion\u0027)"
      },
      "discovery_date": "2026-08-13T22:16:52.493058+00:00",
      "flags": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "2515840"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the `encoding/xml` package of Go. The `DecodeElement` function failed to correctly track recursion depth, which could lead to stack exhaustion. A remote attacker could exploit this vulnerability by providing a specially crafted XML input, resulting in a Denial of Service (DoS) for the affected application.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "An Important denial of service flaw affects applications utilizing the Go `encoding/xml` package. This vulnerability arises from an issue in XML decoding where a recursion depth counter fails to reset, potentially leading to stack exhaustion when processing malicious XML input.",
          "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.",
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        }
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          "details": "For more about Ansible Automation Portal Operator, see References links",
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            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue"
    }
  ]
}

CVE-2026-56859 (GCVE-0-2026-56859)

Vulnerability from cvelistv5 – Published: 2026-08-13 21:58 – Updated: 2026-08-14 15:21

Title

Add recursion depth guard during decode in encoding/xml

Summary

Previously, DecodeElement would reset the depth counter causing it to never fire; this could lead to stack exhaustion.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-14 15:21 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

Go Google root Scorecard

References

4 references

URL	Tags
https://go.dev/issue/80481
https://go.dev/cl/803320
https://groups.google.com/g/golang-announce/c/94p…
https://pkg.go.dev/vuln/GO-2026-6088

Impacted products

1 product

Vendor	Product	Version
Go standard library	encoding/xml	Affected: 0 , < 1.25.13 (semver) Affected: 1.26.0-0 , < 1.26.6 (semver) Affected: 1.27.0-0 , < 1.27.0-rc.3 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
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              "userInteraction": "NONE",
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          "shortName": "CISA-ADP"
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    "cna": {
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          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "encoding/xml",
          "product": "encoding/xml",
          "programRoutines": [
            {
              "name": "Decoder.push"
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            },
            {
              "name": "Decoder.RawToken"
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            {
              "name": "Decoder.unmarshalPath"
            },
            {
              "name": "Decoder.unmarshal"
            },
            {
              "name": "Decoder.Decode"
            },
            {
              "name": "Decoder.DecodeElement"
            },
            {
              "name": "Decoder.Skip"
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            {
              "name": "Decoder.Token"
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            {
              "name": "Unmarshal"
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          "vendor": "Go standard library",
          "versions": [
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              "status": "affected",
              "version": "0",
              "versionType": "semver"
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              "lessThan": "1.27.0-rc.3",
              "status": "affected",
              "version": "1.27.0-0",
              "versionType": "semver"
            }
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        }
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      "descriptions": [
        {
          "lang": "en",
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        }
      ],
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        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-6088"
        }
      ],
      "title": "Add recursion depth guard during decode in encoding/xml"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-56859",
    "datePublished": "2026-08-13T21:58:52.959Z",
    "dateReserved": "2026-06-23T15:10:49.353Z",
    "dateUpdated": "2026-08-14T15:21:46.218Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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.

Action not permitted

RHSA-2026:73517

CVE-2026-56859 (GCVE-0-2026-56859)

Tags

Sightings

Nomenclature

Related by attack behaviour