RHSA-2026:51194

Vulnerability from csaf_redhat - Published: 2026-08-06 17:21 - Updated: 2026-10-01 23:38
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
Fixed 1 product, the same list as for CVE-2026-33811
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
Fixed 1 product, the same list as for CVE-2026-33811
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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          "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"
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          "text": "golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing",
          "title": "Vulnerability summary"
        },
        {
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          "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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            "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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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.



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.