Vulnerability-Lookup

RHSA-2026:50894

Vulnerability from csaf_redhat - Published: 2026-08-05 18:15 - Updated: 2026-08-22 14:52

Summary

Red Hat Security Advisory: RHTAS 1.4.3 - Red Hat Trusted Artifact Signer Release

Severity

Important

Notes

Topic: The 1.4.3 release of Red Hat Trusted Artifact Signer OpenShift Operator. For more details please visit the product documentation at https://access.redhat.com/documentation/en-us/red_hat_trusted_artifact_signer/1.4

Details: The RHTAS Operator can be used with OpenShift Container Platform 4.17, 4.18, 4.19, 4.20, 4.21, 4.22

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-2026-25681

A flaw was found in golang.org/x/net/html. A remote attacker could exploit this vulnerability by providing specially crafted HTML. When this arbitrary HTML is parsed and rendered, it can result in an unexpected HTML tree, bypassing input sanitization. This can be leveraged to execute Cross-Site Scripting (XSS) attacks, potentially leading to arbitrary code execution in applications that use the affected component.

8.1 (High)


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

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected products

Fixed 1 product

Product	Identifier	Version	Remediation
Unresolved product id: Red Hat Trusted Artifact Signer 1.4:registry.redhat.io/rhtas/rhtas-rhel9-operator@sha256:5260ea09f0e38ff2da31d122fd4130d998ed9930ec539144018654e25329a7ea_amd64		—	Vendor Fix fix Workaround

Known not affected 1 product

Product	Identifier	Version	Remediation
Unresolved product id: Red Hat Trusted Artifact Signer 1.4:registry.redhat.io/rhtas/rhtas-operator-bundle@sha256:195df73746aaab5f31babde709336f74c9bda535cd064585afac38a53b919195_amd64		—	Workaround

Threats

Impact Important

CVE-2026-27136

A flaw was found in golang.org/x/net/html. When arbitrary HTML is parsed and then rendered, it can result in an unexpected HTML tree. This allows an attacker to bypass HTML sanitization mechanisms, leading to Cross-Site Scripting (XSS) attacks in applications. Such attacks can result in information disclosure or arbitrary code execution.

8.1 (High)


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

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Affected products

Fixed 1 product

Product	Identifier	Version	Remediation
Unresolved product id: Red Hat Trusted Artifact Signer 1.4:registry.redhat.io/rhtas/rhtas-rhel9-operator@sha256:5260ea09f0e38ff2da31d122fd4130d998ed9930ec539144018654e25329a7ea_amd64		—	Vendor Fix fix Workaround

Known not affected 1 product

Product	Identifier	Version	Remediation
Unresolved product id: Red Hat Trusted Artifact Signer 1.4:registry.redhat.io/rhtas/rhtas-operator-bundle@sha256:195df73746aaab5f31babde709336f74c9bda535cd064585afac38a53b919195_amd64		—	Workaround

Threats

Impact Important

References

22 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:50894	self
https://access.redhat.com/documentation/en-us/red…	external
https://access.redhat.com/documentation/en-us/red…	external
https://access.redhat.com/security/cve/CVE-2026-25681	external
https://access.redhat.com/security/cve/CVE-2026-27136	external
https://access.redhat.com/security/updates/classi…	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-25681	self
https://bugzilla.redhat.com/show_bug.cgi?id=2480761	external
https://www.cve.org/CVERecord?id=CVE-2026-25681	external
https://nvd.nist.gov/vuln/detail/CVE-2026-25681	external
https://go.dev/cl/781703	external
https://go.dev/issue/79574	external
https://groups.google.com/g/golang-announce/c/iI-…	external
https://pkg.go.dev/vuln/GO-2026-5029	external
https://access.redhat.com/security/cve/CVE-2026-27136	self
https://bugzilla.redhat.com/show_bug.cgi?id=2480757	external
https://www.cve.org/CVERecord?id=CVE-2026-27136	external
https://nvd.nist.gov/vuln/detail/CVE-2026-27136	external
https://go.dev/cl/781685	external
https://go.dev/issue/79575	external
https://pkg.go.dev/vuln/GO-2026-5030	external

JSON

To clipboard

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          "category": "external",
          "summary": "RHBZ#2480757",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480757"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-27136",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-27136"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-27136",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27136"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/781685",
          "url": "https://go.dev/cl/781685"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/79575",
          "url": "https://go.dev/issue/79575"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8",
          "url": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-5030",
          "url": "https://pkg.go.dev/vuln/GO-2026-5030"
        }
      ],
      "release_date": "2026-05-22T15:01:22.111000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-05T18:15:16+00:00",
          "details": "Red Hat Trusted Artifact Signer simplifies cryptographic signing and verifying of software artifacts such as container images, binaries and source code changes. It is a self-managed on-premise deployment of the Sigstore project available at https://sigstore.dev\n\nPlatform Engineers, Software Developers and Security Professionals may use RHTAS to ensure the integrity, transparency and assurance of their organization\u0027s software supply chain.\n\nFor details on using the operator, refer to the product documentation at https://access.redhat.com/documentation/en-us/red_hat_trusted_artifact_signer/1.4\n\nYou can find the release notes for this version of Red Hat Trusted Artifact Signer at https://access.redhat.com/documentation/en-us/red_hat_trusted_artifact_signer/1.4/html-single/release_notes/index",
          "product_ids": [
            "Red Hat Trusted Artifact Signer 1.4:registry.redhat.io/rhtas/rhtas-rhel9-operator@sha256:5260ea09f0e38ff2da31d122fd4130d998ed9930ec539144018654e25329a7ea_amd64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:50894"
        },
        {
          "category": "workaround",
          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
          "product_ids": [
            "Red Hat Trusted Artifact Signer 1.4:registry.redhat.io/rhtas/rhtas-operator-bundle@sha256:195df73746aaab5f31babde709336f74c9bda535cd064585afac38a53b919195_amd64",
            "Red Hat Trusted Artifact Signer 1.4:registry.redhat.io/rhtas/rhtas-rhel9-operator@sha256:5260ea09f0e38ff2da31d122fd4130d998ed9930ec539144018654e25329a7ea_amd64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "Red Hat Trusted Artifact Signer 1.4:registry.redhat.io/rhtas/rhtas-operator-bundle@sha256:195df73746aaab5f31babde709336f74c9bda535cd064585afac38a53b919195_amd64",
            "Red Hat Trusted Artifact Signer 1.4:registry.redhat.io/rhtas/rhtas-rhel9-operator@sha256:5260ea09f0e38ff2da31d122fd4130d998ed9930ec539144018654e25329a7ea_amd64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via HTML parsing bypass"
    }
  ]
}

CVE-2026-25681 (GCVE-0-2026-25681)

Vulnerability from cvelistv5 – Published: 2026-05-22 15:01 – Updated: 2026-05-22 17:46

Title

Invoking incorrect handling of character references in DOCTYPE nodes in golang.org/x/net/html

Summary

Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree. This can be leveraged to execute XSS attacks in applications that attempt to sanitize input HTML before rendering.

Severity

6.1 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-22 17:46 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

Go Google root

References

4 references

URL	Tags
https://go.dev/issue/79574
https://groups.google.com/g/golang-announce/c/iI-…
https://go.dev/cl/781703
https://pkg.go.dev/vuln/GO-2026-5029

Impacted products

1 product

Vendor	Product	Version
golang.org/x/net	golang.org/x/net/html	Affected: 0 , < 0.55.0 (semver)

Credits

ensy

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 6.1,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "LOW",
              "privilegesRequired": "NONE",
              "scope": "CHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-25681",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-22T17:46:00.775026Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-22T17:46:20.366Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "golang.org/x/net/html",
          "product": "golang.org/x/net/html",
          "programRoutines": [
            {
              "name": "parser.parse"
            },
            {
              "name": "Parse"
            },
            {
              "name": "ParseFragment"
            },
            {
              "name": "ParseFragmentWithOptions"
            },
            {
              "name": "ParseWithOptions"
            }
          ],
          "vendor": "golang.org/x/net",
          "versions": [
            {
              "lessThan": "0.55.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "ensy"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree. This can be leveraged to execute XSS attacks in applications that attempt to sanitize input HTML before rendering."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-22T15:01:21.975Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/issue/79574"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8"
        },
        {
          "url": "https://go.dev/cl/781703"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-5029"
        }
      ],
      "title": "Invoking  incorrect handling of character references in DOCTYPE nodes in golang.org/x/net/html"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-25681",
    "datePublished": "2026-05-22T15:01:21.975Z",
    "dateReserved": "2026-02-05T01:35:43.738Z",
    "dateUpdated": "2026-05-22T17:46:20.366Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-27136 (GCVE-0-2026-27136)

Vulnerability from cvelistv5 – Published: 2026-05-22 15:01 – Updated: 2026-05-22 16:59

Title

Invoking duplicate attributes can cause XSS in golang.org/x/net/html

Summary

Severity

6.1 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-22 16:59 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

Go Google root

References

4 references

URL	Tags
https://go.dev/issue/79575
https://groups.google.com/g/golang-announce/c/iI-…
https://go.dev/cl/781685
https://pkg.go.dev/vuln/GO-2026-5030

Impacted products

1 product

Vendor	Product	Version
golang.org/x/net	golang.org/x/net/html	Affected: 0 , < 0.55.0 (semver)

Credits

ensy

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 6.1,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "LOW",
              "privilegesRequired": "NONE",
              "scope": "CHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-27136",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-22T16:59:35.355098Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-22T16:59:52.807Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "golang.org/x/net/html",
          "product": "golang.org/x/net/html",
          "programRoutines": [
            {
              "name": "parser.parse"
            },
            {
              "name": "Parse"
            },
            {
              "name": "ParseFragment"
            },
            {
              "name": "ParseFragmentWithOptions"
            },
            {
              "name": "ParseWithOptions"
            }
          ],
          "vendor": "golang.org/x/net",
          "versions": [
            {
              "lessThan": "0.55.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "ensy"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Parsing arbitrary HTML which is then rendered using Render can result in an unexpected HTML tree. This can be leveraged to execute XSS attacks in applications that attempt to sanitize input HTML before rendering."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-22T15:01:22.111Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/issue/79575"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8"
        },
        {
          "url": "https://go.dev/cl/781685"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-5030"
        }
      ],
      "title": "Invoking  duplicate attributes can cause XSS in golang.org/x/net/html"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-27136",
    "datePublished": "2026-05-22T15:01:22.111Z",
    "dateReserved": "2026-02-17T19:57:28.434Z",
    "dateUpdated": "2026-05-22T16:59:52.807Z",
    "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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

RHSA-2026:50894

CVE-2026-25681 (GCVE-0-2026-25681)

CVE-2026-27136 (GCVE-0-2026-27136)

Tags

Sightings

Nomenclature