RHSA-2026:51194

Vulnerability from csaf_redhat - Published: 2026-08-06 17:21 - Updated: 2026-08-25 16:24
Summary
Red Hat Security Advisory: Technical preview of the satellite/iop-vmaas-rhel9 container image
Severity
Important
Notes
Topic: A new satellite/iop-vmaas-rhel9 container image is now available as a technical preview in the Red Hat container registry.
Details: Red Hat Lightspeed in Satellite analyzes system health and configuration by applying predefined rules to a small set of local data, such as installed packages, running services, and configuration settings.
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-2026-33811

A flaw was found in the `net` package of Go (golang), specifically when using the `LookupCNAME` function with the `cgo` DNS resolver. A remote attacker could exploit this by providing a very long Canonical Name (CNAME) response. This can trigger a double-free of C memory, leading to a crash and 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-1341 - Multiple Releases of Same Resource or Handle
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Satellite 6.19:registry.redhat.io/satellite/iop-vmaas-rhel9@sha256:c5674748f760874d42a46d918ce7bb9f39c6beb2607b6644ba490e6c7712ae5f_amd64 —
Vendor Fix fix
Workaround
Threats
Impact Important
CVE-2026-39821

A flaw was found in golang.org/x/net/idna. ToASCII and ToUnicode incorrectly accept Punycode-encoded labels that decode to an ASCII-only hostname (for example, xn--example-.com returns example.com instead of an error). Applications that validate the ASCII form then convert to Unicode may grant access to a restricted hostname the ASCII check would have rejected.

8.2 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Satellite 6.19:registry.redhat.io/satellite/iop-vmaas-rhel9@sha256:c5674748f760874d42a46d918ce7bb9f39c6beb2607b6644ba490e6c7712ae5f_amd64 —
Vendor Fix fix
Workaround
Threats
Impact Important
CVE-2026-42561

A flaw was found in python-multipart. A remote attacker can exploit this denial of service (DoS) vulnerability by sending a specially crafted request with an excessive number of part headers or a single very large header value during multipart/form-data parsing. This can lead to excessive CPU utilization, resulting in a denial of service for the affected system.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-606 - Unchecked Input for Loop Condition
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Satellite 6.19:registry.redhat.io/satellite/iop-vmaas-rhel9@sha256:c5674748f760874d42a46d918ce7bb9f39c6beb2607b6644ba490e6c7712ae5f_amd64 —
Vendor Fix fix
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:51194 self
https://access.redhat.com/documentation/en-us/red… external
https://access.redhat.com/security/cve/CVE-2026-33811 external
https://access.redhat.com/security/cve/CVE-2026-39821 external
https://access.redhat.com/security/cve/CVE-2026-42561 external
https://access.redhat.com/security/updates/classi… external
https://catalog.redhat.com/software/containers/search external
https://docs.redhat.com/en/documentation/red_hat_… 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-2026-33811 self
https://bugzilla.redhat.com/show_bug.cgi?id=2467822 external
https://www.cve.org/CVERecord?id=CVE-2026-33811 external
https://nvd.nist.gov/vuln/detail/CVE-2026-33811 external
https://go.dev/cl/767860 external
https://go.dev/issue/78803 external
https://groups.google.com/g/golang-announce/c/qcC… external
https://pkg.go.dev/vuln/GO-2026-4981 external
https://access.redhat.com/security/cve/CVE-2026-39821 self
https://bugzilla.redhat.com/show_bug.cgi?id=2480756 external
https://www.cve.org/CVERecord?id=CVE-2026-39821 external
https://nvd.nist.gov/vuln/detail/CVE-2026-39821 external
https://go.dev/cl/767220 external
https://go.dev/issue/78760 external
https://groups.google.com/g/golang-announce/c/iI-… external
https://pkg.go.dev/vuln/GO-2026-5026 external
https://access.redhat.com/security/cve/CVE-2026-42561 self
https://bugzilla.redhat.com/show_bug.cgi?id=2477309 external
https://www.cve.org/CVERecord?id=CVE-2026-42561 external
https://nvd.nist.gov/vuln/detail/CVE-2026-42561 external
https://github.com/Kludex/python-multipart/securi… external
To clipboard 

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            "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",
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      "title": "net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME"
    },
    {
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      "cwe": {
        "id": "CWE-1289",
        "name": "Improper Validation of Unsafe Equivalence in Input"
      },
      "discovery_date": "2026-05-22T16:00:52.844126+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "2480756"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in golang.org/x/net/idna. ToASCII and ToUnicode incorrectly accept Punycode-encoded labels that decode to an ASCII-only hostname (for example, xn--example-.com returns example.com instead of an error). Applications that validate the ASCII form then convert to Unicode may grant access to a restricted hostname the ASCII check would have rejected.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "golang.org/x/net/idna is vulnerable to privilege escalation through incorrect Punycode label handling in ToASCII and ToUnicode. An attacker who can supply a Punycode hostname that passes an ASCII-only authorization check may have it normalized to a restricted ASCII name the application intended to block. Red Hat exposure is broad across products shipping the Go toolchain or bundling golang.org/x/net, including RHEL and RHEL-AI golang RPMs, hummingbird Go runtimes, OpenShift and ODF container builds, and Ceph/OpenShift components compiled against affected x/net versions.",
          "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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          "details": "Upgrade to a fixed golang.org/x/net release that includes the idna correction, via updated golang or dependent package rebuilds.",
          "product_ids": [
            "Red Hat Satellite 6.19:registry.redhat.io/satellite/iop-vmaas-rhel9@sha256:c5674748f760874d42a46d918ce7bb9f39c6beb2607b6644ba490e6c7712ae5f_amd64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "Red Hat Satellite 6.19:registry.redhat.io/satellite/iop-vmaas-rhel9@sha256:c5674748f760874d42a46d918ce7bb9f39c6beb2607b6644ba490e6c7712ae5f_amd64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing"
    },
    {
      "cve": "CVE-2026-42561",
      "cwe": {
        "id": "CWE-606",
        "name": "Unchecked Input for Loop Condition"
      },
      "discovery_date": "2026-05-13T22:01:05.319675+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2477309"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in python-multipart. A remote attacker can exploit this denial of service (DoS) vulnerability by sending a specially crafted request with an excessive number of part headers or a single very large header value during multipart/form-data parsing. This can lead to excessive CPU utilization, resulting in a denial of service for the affected system.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "python-multipart: python-multipart: Denial of Service via excessive multipart part headers",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is an Important denial of service vulnerability in python-multipart. A remote attacker can trigger excessive CPU utilization by sending specially crafted multipart/form-data requests, leading to service disruption.",
          "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"
        }
      ],
      "product_status": {
        "fixed": [
          "Red Hat Satellite 6.19:registry.redhat.io/satellite/iop-vmaas-rhel9@sha256:c5674748f760874d42a46d918ce7bb9f39c6beb2607b6644ba490e6c7712ae5f_amd64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-42561"
        },
        {
          "category": "external",
          "summary": "RHBZ#2477309",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2477309"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-42561",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-42561"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42561",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42561"
        },
        {
          "category": "external",
          "summary": "https://github.com/Kludex/python-multipart/security/advisories/GHSA-pp6c-gr5w-3c5g",
          "url": "https://github.com/Kludex/python-multipart/security/advisories/GHSA-pp6c-gr5w-3c5g"
        }
      ],
      "release_date": "2026-05-13T20:55:11.767000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-06T17:21:13+00:00",
          "details": "For Red Hat Lightspeed in Satellite installation see the Red Hat Satellite documentation.",
          "product_ids": [
            "Red Hat Satellite 6.19:registry.redhat.io/satellite/iop-vmaas-rhel9@sha256:c5674748f760874d42a46d918ce7bb9f39c6beb2607b6644ba490e6c7712ae5f_amd64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:51194"
        }
      ],
      "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 Satellite 6.19:registry.redhat.io/satellite/iop-vmaas-rhel9@sha256:c5674748f760874d42a46d918ce7bb9f39c6beb2607b6644ba490e6c7712ae5f_amd64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "python-multipart: python-multipart: Denial of Service via excessive multipart part headers"
    }
  ]
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.