Vulnerability-Lookup

RHSA-2026:93972

Vulnerability from csaf_redhat - Published: 2026-11-02 16:00 - Updated: 2026-11-11 02:41

Summary

Red Hat Security Advisory: OpenShift Virtualization v4.12 Images

Severity

Important

Notes

Topic: Red Hat OpenShift Virtualization release v4.12 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 v4.12 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-2026-33818

A flaw was found in the `encoding/asn1` package in Go. An attacker could provide a specially crafted, deeply-nested Abstract Syntax Notation One (ASN.1) structure, leading to excessive recursion during the `Unmarshal` operation. This could result in stack 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-776 - Improper Restriction of Recursive Entity References in DTDs

Affected products

Fixed 1 product

Product	Identifier	Version	Remediation
Unresolved product id: Red Hat Container Native Virtualization 4.12:registry.redhat.io/container-native-virtualization/cluster-network-addons-operator@sha256:588e091578ac6828581613dad9c191e9c5b7abc41a12eafa26f28ffe66d5f3ef_amd64		—	Vendor Fix fix Workaround

Known not affected 5 products

Product	Version	Remediation
Unresolved product id: Red Hat Container Native Virtualization 4.12:registry.redhat.io/container-native-virtualization/bridge-marker@sha256:f1d423b8a6c5d2335e4e0acab2488629973e2ec957b39cf590780b96978b6603_amd64	—	Workaround
Unresolved product id: Red Hat Container Native Virtualization 4.12:registry.redhat.io/container-native-virtualization/cnv-containernetworking-plugins@sha256:5b549cb3586073c6c40c4e0cedfec040776410ce58d17f27a01a8bf3e4caa2d7_amd64	—	Workaround
Unresolved product id: Red Hat Container Native Virtualization 4.12:registry.redhat.io/container-native-virtualization/kubemacpool@sha256:ee5372878218b0e4eb951cf5515ccb22b19ca0ebef4482277cfcee170f40b734_amd64	—	Workaround
Unresolved product id: Red Hat Container Native Virtualization 4.12:registry.redhat.io/container-native-virtualization/ovs-cni-marker@sha256:6b1e13466130913c92851a0b761d2387cbda42ef5bdbd9391467d194e596df88_amd64	—	Workaround
Unresolved product id: Red Hat Container Native Virtualization 4.12:registry.redhat.io/container-native-virtualization/ovs-cni-plugin@sha256:a1272bb3c99df02e264b83243f6d891343d11f273f3c7b3100bd9f330e59ec09_amd64	—	Workaround

Threats

Impact Important

References

12 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:93972	self
https://access.redhat.com/security/cve/CVE-2026-33818	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-2026-33818	self
https://bugzilla.redhat.com/show_bug.cgi?id=2515815	external
https://www.cve.org/CVERecord?id=CVE-2026-33818	external
https://nvd.nist.gov/vuln/detail/CVE-2026-33818	external
https://go.dev/cl/814980	external
https://go.dev/issue/80405	external
https://groups.google.com/g/golang-announce/c/94p…	external
https://pkg.go.dev/vuln/GO-2026-5972	external

JSON

To clipboard

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        {
          "category": "description",
          "text": "A flaw was found in the `encoding/asn1` package in Go. An attacker could provide a specially crafted, deeply-nested Abstract Syntax Notation One (ASN.1) structure, leading to excessive recursion during the `Unmarshal` operation. This could result in stack exhaustion and a Denial of Service (DoS) condition.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is an Important denial of service flaw in the Go encoding/asn1 package, as it can be triggered remotely without authentication. An attacker can provide a malformed ASN.1 structure, causing excessive recursion during unmarshalling and leading to stack exhaustion, which can render the service unavailable.",
          "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"
        }
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          "Red Hat Container Native Virtualization 4.12:registry.redhat.io/container-native-virtualization/ovs-cni-marker@sha256:6b1e13466130913c92851a0b761d2387cbda42ef5bdbd9391467d194e596df88_amd64",
          "Red Hat Container Native Virtualization 4.12:registry.redhat.io/container-native-virtualization/ovs-cni-plugin@sha256:a1272bb3c99df02e264b83243f6d891343d11f273f3c7b3100bd9f330e59ec09_amd64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-33818"
        },
        {
          "category": "external",
          "summary": "RHBZ#2515815",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515815"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-33818",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-33818"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33818",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33818"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/814980",
          "url": "https://go.dev/cl/814980"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/80405",
          "url": "https://go.dev/issue/80405"
        },
        {
          "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-2026-5972",
          "url": "https://pkg.go.dev/vuln/GO-2026-5972"
        }
      ],
      "release_date": "2026-08-13T21:58:52.821000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-02T16:00:27+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 4.12:registry.redhat.io/container-native-virtualization/cluster-network-addons-operator@sha256:588e091578ac6828581613dad9c191e9c5b7abc41a12eafa26f28ffe66d5f3ef_amd64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:93972"
        },
        {
          "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 Container Native Virtualization 4.12:registry.redhat.io/container-native-virtualization/bridge-marker@sha256:f1d423b8a6c5d2335e4e0acab2488629973e2ec957b39cf590780b96978b6603_amd64",
            "Red Hat Container Native Virtualization 4.12:registry.redhat.io/container-native-virtualization/cluster-network-addons-operator@sha256:588e091578ac6828581613dad9c191e9c5b7abc41a12eafa26f28ffe66d5f3ef_amd64",
            "Red Hat Container Native Virtualization 4.12:registry.redhat.io/container-native-virtualization/cnv-containernetworking-plugins@sha256:5b549cb3586073c6c40c4e0cedfec040776410ce58d17f27a01a8bf3e4caa2d7_amd64",
            "Red Hat Container Native Virtualization 4.12:registry.redhat.io/container-native-virtualization/kubemacpool@sha256:ee5372878218b0e4eb951cf5515ccb22b19ca0ebef4482277cfcee170f40b734_amd64",
            "Red Hat Container Native Virtualization 4.12:registry.redhat.io/container-native-virtualization/ovs-cni-marker@sha256:6b1e13466130913c92851a0b761d2387cbda42ef5bdbd9391467d194e596df88_amd64",
            "Red Hat Container Native Virtualization 4.12:registry.redhat.io/container-native-virtualization/ovs-cni-plugin@sha256:a1272bb3c99df02e264b83243f6d891343d11f273f3c7b3100bd9f330e59ec09_amd64"
          ]
        }
      ],
      "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 4.12:registry.redhat.io/container-native-virtualization/bridge-marker@sha256:f1d423b8a6c5d2335e4e0acab2488629973e2ec957b39cf590780b96978b6603_amd64",
            "Red Hat Container Native Virtualization 4.12:registry.redhat.io/container-native-virtualization/cluster-network-addons-operator@sha256:588e091578ac6828581613dad9c191e9c5b7abc41a12eafa26f28ffe66d5f3ef_amd64",
            "Red Hat Container Native Virtualization 4.12:registry.redhat.io/container-native-virtualization/cnv-containernetworking-plugins@sha256:5b549cb3586073c6c40c4e0cedfec040776410ce58d17f27a01a8bf3e4caa2d7_amd64",
            "Red Hat Container Native Virtualization 4.12:registry.redhat.io/container-native-virtualization/kubemacpool@sha256:ee5372878218b0e4eb951cf5515ccb22b19ca0ebef4482277cfcee170f40b734_amd64",
            "Red Hat Container Native Virtualization 4.12:registry.redhat.io/container-native-virtualization/ovs-cni-marker@sha256:6b1e13466130913c92851a0b761d2387cbda42ef5bdbd9391467d194e596df88_amd64",
            "Red Hat Container Native Virtualization 4.12:registry.redhat.io/container-native-virtualization/ovs-cni-plugin@sha256:a1272bb3c99df02e264b83243f6d891343d11f273f3c7b3100bd9f330e59ec09_amd64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal"
    }
  ]
}

CVE-2026-33818 (GCVE-0-2026-33818)

Vulnerability from cvelistv5 – Published: 2026-08-13 21:58 – Updated: 2026-11-11 03:13

Title

Enforce maximum recursion depth in encoding/asn1

Summary

Enforce a recursion limit in Unmarshal to prevent stack exhaustion when parsing deeply-nested, recursive structures.

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 15:11 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

Go CNA under the Google root

CNA scorecard E 42/100 over 76 records in the last 180 days details

References

4 references

URL	Tags
https://go.dev/issue/80405
https://groups.google.com/g/golang-announce/c/94p…
https://go.dev/cl/814980
https://pkg.go.dev/vuln/GO-2026-5972

Impacted products

1 product

Vendor	Product	Version
Go standard library	encoding/asn1	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

Marwan Atia (marwansamir688@gmail.com)

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-2026-33818",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-14T15:11:19.904646Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-400",
                "description": "CWE-400 Uncontrolled Resource Consumption",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-14T15:12:34.877Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "encoding/asn1",
          "product": "encoding/asn1",
          "programRoutines": [
            {
              "name": "parseSequenceOf"
            },
            {
              "name": "parseField"
            },
            {
              "name": "UnmarshalWithParams"
            },
            {
              "name": "Unmarshal"
            }
          ],
          "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": "Marwan Atia (marwansamir688@gmail.com)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Enforce a recursion limit in Unmarshal to prevent stack exhaustion when parsing deeply-nested, recursive structures."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-11T03:13:09.554Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
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          "url": "https://go.dev/issue/80405"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
        },
        {
          "url": "https://go.dev/cl/814980"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-5972"
        }
      ],
      "title": "Enforce maximum recursion depth in encoding/asn1"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-33818",
    "datePublished": "2026-08-13T21:58:52.821Z",
    "dateReserved": "2026-03-23T20:35:32.815Z",
    "dateUpdated": "2026-11-11T03:13:09.554Z",
    "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

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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