Vulnerability-Lookup

RHSA-2026:75908

Vulnerability from csaf_redhat - Published: 2026-10-05 13:24 - Updated: 2026-10-06 11:50

Summary

Red Hat Security Advisory: OpenShift Virtualization v4.16 Images

Severity

Important

Notes

Topic: Red Hat OpenShift Virtualization release v4.16 is now available with updates to packages and images that fix several bugs and add enhancements.

Details: OpenShift Virtualization is Red Hat's virtualization solution designed for Red Hat OpenShift Container Platform. This advisory contains OpenShift Virtualization v4.16 images.

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-2026-56862

A flaw was found in the `crypto/tls` package, part of `golang`. A malicious client can exploit this vulnerability by continuously sending KeyUpdate messages to a server. This forces the server to perform indefinite key derivation operations, leading to resource exhaustion and a Denial of Service (DoS) condition.

7.5 (High)


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

CWE-1050 - Excessive Platform Resource Consumption within a Loop

Affected products

Fixed 2 products

Product	Identifier	Version	Remediation
Unresolved product id: Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/kubemacpool-rhel9@sha256:580fa5387308c4362fde177ccf07609b35f6f61fbc686ca751560960edbee848_arm64		—	Vendor Fix fix
Unresolved product id: Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/kubemacpool-rhel9@sha256:e208193093a30055b49f1dd161194b4af6ebe94bd2bbb326e57d295b4111ff59_amd64		—	Vendor Fix fix

Known not affected 12 products

Product	Identifier	Version	Remediation
Unresolved product id: Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/bridge-marker-rhel9@sha256:afb6c5609cdf6f1e338065e378cd57559daa17f00885dffc77856974590fd15b_arm64		—
Unresolved product id: Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/bridge-marker-rhel9@sha256:e71b03447e16c18ad63a7fa27001764e39037b0a10507ec67bd123c9bb690559_amd64		—
Unresolved product id: Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/cluster-network-addons-operator-rhel9@sha256:655d22afd39a5fac09199f64b365500cd6d1d125893b9e9aa832270354138412_amd64		—
Unresolved product id: Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/cluster-network-addons-operator-rhel9@sha256:ac19c3ac63e53a9b005b70cd8947eb8cd3c83ccff83c393d08eb3abaca338e1e_arm64		—
Unresolved product id: Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/cnv-containernetworking-plugins-rhel9@sha256:3c5672450cbf11254024784fc8521ea3ffa787a6c9564f235e86f54afde4e00c_amd64		—
Unresolved product id: Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/cnv-containernetworking-plugins-rhel9@sha256:5cdf5745df188431e493890e543c6899dda57bea5235dd83307c805d0ee5dcd4_arm64		—
Unresolved product id: Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/kubesecondarydns-rhel9@sha256:07ec279cd29ed840b508b3724d3e5af44039d99f2f57cec0a5148095f3a9285e_amd64		—
Unresolved product id: Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/kubesecondarydns-rhel9@sha256:9fdbc96216faad93f4c73ea8fab96d916d957fae36fd01d9c3f3170120983402_arm64		—
Unresolved product id: Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/multus-dynamic-networks-rhel9@sha256:20c99e53550bc1db8896bdaa3c6a9bec6733e559a53056da957a03c44a2e5019_arm64		—
Unresolved product id: Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/multus-dynamic-networks-rhel9@sha256:6a6dfd6608d170892cff8325f2b279aff76835ce780039660c3cc87b39353ed2_amd64		—
Unresolved product id: Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/ovs-cni-plugin-rhel9@sha256:0261e92f4a5bbd8ac0a525111a92979df356f01b7b52bba1f3c01be5b3f59c7e_arm64		—
Unresolved product id: Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/ovs-cni-plugin-rhel9@sha256:428993d7a46e0f5eae74bfa1513b6739dfba84e756a689689b0fa9b1c9772803_amd64		—

Threats

Impact Important

References

12 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:75908	self
https://access.redhat.com/security/cve/CVE-2026-56862	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-2026-56862	self
https://bugzilla.redhat.com/show_bug.cgi?id=2515839	external
https://www.cve.org/CVERecord?id=CVE-2026-56862	external
https://nvd.nist.gov/vuln/detail/CVE-2026-56862	external
https://go.dev/cl/804261	external
https://go.dev/issue/80528	external
https://groups.google.com/g/golang-announce/c/94p…	external
https://pkg.go.dev/vuln/GO-2026-6090	external

JSON

To clipboard

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          "title": "Vulnerability summary"
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          "text": "This is an Important denial of service vulnerability in the `golang` `crypto/tls` package. A remote, unauthenticated attacker can exploit this flaw by continuously sending `KeyUpdate` messages during a TLS handshake, forcing the server to perform indefinite key derivation operations. This resource exhaustion can lead to a denial of service for applications and services in Red Hat products that use the affected `crypto/tls` library and are exposed to untrusted network clients.",
          "title": "Statement"
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          "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"
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        },
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          "category": "external",
          "summary": "RHBZ#2515839",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515839"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-56862",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-56862"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-56862",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56862"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/804261",
          "url": "https://go.dev/cl/804261"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/80528",
          "url": "https://go.dev/issue/80528"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/94pEornpRlI",
          "url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-6090",
          "url": "https://pkg.go.dev/vuln/GO-2026-6090"
        }
      ],
      "release_date": "2026-08-13T21:58:53.216000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-05T13:24:58+00:00",
          "details": "Before applying this update, make sure all previously released errata relevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
            "Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/kubemacpool-rhel9@sha256:580fa5387308c4362fde177ccf07609b35f6f61fbc686ca751560960edbee848_arm64",
            "Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/kubemacpool-rhel9@sha256:e208193093a30055b49f1dd161194b4af6ebe94bd2bbb326e57d295b4111ff59_amd64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:75908"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "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": [
            "Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/bridge-marker-rhel9@sha256:afb6c5609cdf6f1e338065e378cd57559daa17f00885dffc77856974590fd15b_arm64",
            "Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/bridge-marker-rhel9@sha256:e71b03447e16c18ad63a7fa27001764e39037b0a10507ec67bd123c9bb690559_amd64",
            "Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/cluster-network-addons-operator-rhel9@sha256:655d22afd39a5fac09199f64b365500cd6d1d125893b9e9aa832270354138412_amd64",
            "Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/cluster-network-addons-operator-rhel9@sha256:ac19c3ac63e53a9b005b70cd8947eb8cd3c83ccff83c393d08eb3abaca338e1e_arm64",
            "Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/cnv-containernetworking-plugins-rhel9@sha256:3c5672450cbf11254024784fc8521ea3ffa787a6c9564f235e86f54afde4e00c_amd64",
            "Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/cnv-containernetworking-plugins-rhel9@sha256:5cdf5745df188431e493890e543c6899dda57bea5235dd83307c805d0ee5dcd4_arm64",
            "Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/kubemacpool-rhel9@sha256:580fa5387308c4362fde177ccf07609b35f6f61fbc686ca751560960edbee848_arm64",
            "Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/kubemacpool-rhel9@sha256:e208193093a30055b49f1dd161194b4af6ebe94bd2bbb326e57d295b4111ff59_amd64",
            "Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/kubesecondarydns-rhel9@sha256:07ec279cd29ed840b508b3724d3e5af44039d99f2f57cec0a5148095f3a9285e_amd64",
            "Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/kubesecondarydns-rhel9@sha256:9fdbc96216faad93f4c73ea8fab96d916d957fae36fd01d9c3f3170120983402_arm64",
            "Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/multus-dynamic-networks-rhel9@sha256:20c99e53550bc1db8896bdaa3c6a9bec6733e559a53056da957a03c44a2e5019_arm64",
            "Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/multus-dynamic-networks-rhel9@sha256:6a6dfd6608d170892cff8325f2b279aff76835ce780039660c3cc87b39353ed2_amd64",
            "Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/ovs-cni-plugin-rhel9@sha256:0261e92f4a5bbd8ac0a525111a92979df356f01b7b52bba1f3c01be5b3f59c7e_arm64",
            "Red Hat Container Native Virtualization 4.16:registry.redhat.io/container-native-virtualization/ovs-cni-plugin-rhel9@sha256:428993d7a46e0f5eae74bfa1513b6739dfba84e756a689689b0fa9b1c9772803_amd64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages"
    }
  ]
}

CVE-2026-56862 (GCVE-0-2026-56862)

Vulnerability from cvelistv5 – Published: 2026-08-13 21:58 – Updated: 2026-08-14 15:29

Title

Limit handshake messages we are willing to accept post-handshake in crypto/tls

Summary

Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key derivation operations indefinitely.

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 15:27 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/80528
https://go.dev/cl/804261
https://groups.google.com/g/golang-announce/c/94p…
https://pkg.go.dev/vuln/GO-2026-6090

Impacted products

1 product

Vendor	Product	Version
Go standard library	crypto/tls	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)

Credits

Qi Deng of Aurascape.ai

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-56862",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-14T15:27:34.651997Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-770",
                "description": "CWE-770 Allocation of Resources Without Limits or Throttling",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-14T15:29:41.741Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "crypto/tls",
          "product": "crypto/tls",
          "programRoutines": [
            {
              "name": "Conn.readRecordOrCCS"
            },
            {
              "name": "Conn.Handshake"
            },
            {
              "name": "Conn.HandshakeContext"
            },
            {
              "name": "Conn.Read"
            },
            {
              "name": "Conn.Write"
            },
            {
              "name": "Dial"
            },
            {
              "name": "DialWithDialer"
            },
            {
              "name": "Dialer.Dial"
            },
            {
              "name": "Dialer.DialContext"
            },
            {
              "name": "QUICConn.HandleData"
            },
            {
              "name": "QUICConn.Start"
            }
          ],
          "vendor": "Go standard library",
          "versions": [
            {
              "lessThan": "1.25.13",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.26.6",
              "status": "affected",
              "version": "1.26.0-0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.27.0-rc.3",
              "status": "affected",
              "version": "1.27.0-0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Qi Deng of Aurascape.ai"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key derivation operations indefinitely."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-13T21:58:53.216Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/issue/80528"
        },
        {
          "url": "https://go.dev/cl/804261"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-6090"
        }
      ],
      "title": "Limit handshake messages we are willing to accept post-handshake in crypto/tls"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-56862",
    "datePublished": "2026-08-13T21:58:53.216Z",
    "dateReserved": "2026-06-23T15:10:49.353Z",
    "dateUpdated": "2026-08-14T15:29:41.741Z",
    "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-2026:75908

CVE-2026-56862 (GCVE-0-2026-56862)

Tags

Sightings

Nomenclature

Related by attack behaviour