Vulnerability-Lookup

RHSA-2026:91329

Vulnerability from csaf_redhat - Published: 2026-10-27 22:11 - Updated: 2026-11-03 18:43

Summary

Red Hat Security Advisory: Red Hat Service Interconnect 2.2.4 Release (rpms)

Severity

Important

Notes

Topic: RPMs for the Red Hat Service Interconnect 2.2.4 release.

Details: Red Hat Service Interconnect 2.2 creates a service network, linking TCP and HTTP services across the hybrid cloud. A service network enables communication between services running in different network locations or sites. It allows geographically distributed services to connect as if they were all running in the same site.

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-2026-111943

A flaw was found in Go's crypto/x509 package. The certificate verification process fails to block trust in intermediate certificates associated with a compromised Certificate Authority (CA). A remote attacker presenting a certificate signed by these intermediate authorities can impersonate legitimate servers during secure connections. This flaw can enable an attacker to conduct a man-in-the-middle (MitM) attack to intercept or alter confidential communications.

6.8 (Medium)


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

CWE-295 - Improper Certificate Validation

Affected products

Fixed 10 products

Product	Version	Remediation
Unresolved product id: 8Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el8.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 8Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el8.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: 8Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el8.s390x	—	Vendor Fix fix Workaround
Unresolved product id: 8Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el8.src	—	Vendor Fix fix Workaround
Unresolved product id: 8Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el8.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.s390x	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.src	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

11 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:91329	self
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-2026-111943	self
https://bugzilla.redhat.com/show_bug.cgi?id=2556068	external
https://access.redhat.com/security/vulnerabilitie…	external
https://www.cve.org/CVERecord?id=CVE-2026-111943	external
https://nvd.nist.gov/vuln/detail/CVE-2026-111943	external
https://github.com/golang/go/issues/82345	external
https://groups.google.com/g/golang-nuts/c/K22sG2AYnKU	external
https://pkg.go.dev/vuln/GO-2026-6809	external

JSON

To clipboard

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      "discovery_date": "2026-10-20T09:38:36.160000+00:00",
      "ids": [
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          "text": "2556068"
        }
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Go\u0027s crypto/x509 package. The certificate verification process fails to block trust in intermediate certificates associated with a compromised Certificate Authority (CA). A remote attacker presenting a certificate signed by these intermediate authorities can impersonate legitimate servers during secure connections. This flaw can enable an attacker to conduct a man-in-the-middle (MitM) attack to intercept or alter confidential communications.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "crypto/x509: golang: crypto/x509: Man-in-the-middle attacks via untrusted intermediate certificates",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability is rated Important because Go applications validating TLS certificates could accept unauthorized certificates issued by distrusted intermediate Certificate Authorities, potentially compromising the integrity and confidentiality of secure network communications. Any Go-based client or server relying on standard certificate verification may be exposed to man-in-the-middle attacks if an attacker intercepts traffic using certificates derived from these intermediate keys. Exploitation requires specific network positioning and certificates generated by the untrusted intermediate authorities, limiting opportunistic widespread abuse.",
          "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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          "url": "https://pkg.go.dev/vuln/GO-2026-6809"
        }
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          "date": "2026-10-27T22:11:44+00:00",
          "details": "Before applying this update, make sure all previously released errata\nrelevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
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            "9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.aarch64",
            "9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.ppc64le",
            "9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.s390x",
            "9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.src",
            "9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:91329"
        },
        {
          "category": "workaround",
          "details": "See the security bulletin for a detailed mitigation procedure.",
          "product_ids": [
            "8Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el8.aarch64",
            "8Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el8.ppc64le",
            "8Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el8.s390x",
            "8Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el8.src",
            "8Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el8.x86_64",
            "9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.aarch64",
            "9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.ppc64le",
            "9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.s390x",
            "9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.src",
            "9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "8Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el8.aarch64",
            "8Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el8.ppc64le",
            "8Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el8.s390x",
            "8Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el8.src",
            "8Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el8.x86_64",
            "9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.aarch64",
            "9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.ppc64le",
            "9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.s390x",
            "9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.src",
            "9Base-Service-Interconnect-2:skupper-cli-0:2.2.4-1.el9.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "crypto/x509: golang: crypto/x509: Man-in-the-middle attacks via untrusted intermediate certificates"
    }
  ]
}

CVE-2026-111943 (GCVE-0-2026-111943)

Vulnerability from cvelistv5 – Published: 2026-10-21 00:52 – Updated: 2026-10-30 13:08

Title

Distrust compromised intermediate certificates in crypto/x509

Summary

On most platforms, Go uses the given system root certificates. However, in some narrower cases, the system trust stores may not be updated without further action. To defend against the narrower set of cases that may remain affected, a denylist was added in crypto/x509 to return an error when calling Verify with any of the known intermediate certificates that are no longer considered to be trustworthy.

Severity

6.8 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/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 2026-10-30 13:08 UTC

CWE

CWE-299 - Improper Check for Certificate Revocation

Assigner

Go CNA under the Google root

CNA scorecard E 42/100 over 64 records in the last 180 days details

References

5 references

URL	Tags
https://go.dev/cl/851047
https://go.dev/issue/82345
https://groups.google.com/g/golang-announce/c/66p…
https://pkg.go.dev/vuln/GO-2026-6809
http://www.openwall.com/lists/oss-security/2026/1…

Impacted products

1 product

Vendor	Product	Version
Go standard library	crypto/x509	Affected: 0 , < 1.26.10 (semver) Affected: 1.27.0-0 , < 1.27.3 (semver)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-10-21T01:24:20.498Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/10/20/29"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 6.8,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-111943",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-30T13:08:09.750640Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-299",
                "description": "CWE-299 Improper Check for Certificate Revocation",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-30T13:08:13.559Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://pkg.go.dev",
          "defaultStatus": "unaffected",
          "packageName": "crypto/x509",
          "product": "crypto/x509",
          "programRoutines": [
            {
              "name": "Certificate.Verify"
            }
          ],
          "vendor": "Go standard library",
          "versions": [
            {
              "lessThan": "1.26.10",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThan": "1.27.3",
              "status": "affected",
              "version": "1.27.0-0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "On most platforms, Go uses the given system root certificates. However, in some narrower cases, the system trust stores may not be updated without further action. To defend against the narrower set of cases that may remain affected, a denylist was added in crypto/x509 to return an error when calling Verify with any of the known intermediate certificates that are no longer considered to be trustworthy."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-299: Improper Check for Certificate Revocation",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T00:52:18.359Z",
        "orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
        "shortName": "Go"
      },
      "references": [
        {
          "url": "https://go.dev/cl/851047"
        },
        {
          "url": "https://go.dev/issue/82345"
        },
        {
          "url": "https://groups.google.com/g/golang-announce/c/66pojueaQek"
        },
        {
          "url": "https://pkg.go.dev/vuln/GO-2026-6809"
        }
      ],
      "title": "Distrust compromised intermediate certificates in crypto/x509"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
    "assignerShortName": "Go",
    "cveId": "CVE-2026-111943",
    "datePublished": "2026-10-21T00:52:18.359Z",
    "dateReserved": "2026-10-17T13:43:28.599Z",
    "dateUpdated": "2026-10-30T13:08:13.559Z",
    "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

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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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