RHSA-2026:59549

Vulnerability from csaf_redhat - Published: 2026-08-25 18:36 - Updated: 2026-08-27 15:29
Summary
Red Hat Security Advisory: ignition security update
Severity
Important
Notes
Topic: An update for ignition is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Ignition is a utility used to manipulate systems during the initramfs. This includes partitioning disks, formatting partitions, writing files (regular files, systemd units, etc.), and configuring users. On first boot, Ignition reads its configuration from a source of truth (remote URL, network metadata service, hypervisor bridge, etc.) and applies the configuration. Security Fix(es): * golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
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.

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.

CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-0:2.17.0-2.el9_4.1.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-0:2.17.0-2.el9_4.1.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-0:2.17.0-2.el9_4.1.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-0:2.17.0-2.el9_4.1.src
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-0:2.17.0-2.el9_4.1.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-debuginfo-0:2.17.0-2.el9_4.1.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-debuginfo-0:2.17.0-2.el9_4.1.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-debuginfo-0:2.17.0-2.el9_4.1.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-debuginfo-0:2.17.0-2.el9_4.1.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-debugsource-0:2.17.0-2.el9_4.1.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-debugsource-0:2.17.0-2.el9_4.1.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-debugsource-0:2.17.0-2.el9_4.1.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-debugsource-0:2.17.0-2.el9_4.1.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-edge-0:2.17.0-2.el9_4.1.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-edge-0:2.17.0-2.el9_4.1.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-edge-0:2.17.0-2.el9_4.1.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-edge-0:2.17.0-2.el9_4.1.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-validate-0:2.17.0-2.el9_4.1.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-validate-0:2.17.0-2.el9_4.1.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-validate-0:2.17.0-2.el9_4.1.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-validate-0:2.17.0-2.el9_4.1.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-validate-debuginfo-0:2.17.0-2.el9_4.1.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-validate-debuginfo-0:2.17.0-2.el9_4.1.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-validate-debuginfo-0:2.17.0-2.el9_4.1.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.4.0.Z.E4S:ignition-validate-debuginfo-0:2.17.0-2.el9_4.1.x86_64
Vendor Fix fix
Workaround
Threats
Impact Important

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      "cwe": {
        "id": "CWE-1289",
        "name": "Improper Validation of Unsafe Equivalence in Input"
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      "discovery_date": "2026-05-22T16:00:52.844126+00:00",
      "ids": [
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          "text": "2480756"
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        {
          "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.",
          "title": "CVSS score applicability"
        }
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-39821"
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        {
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        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-39821",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39821"
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        {
          "category": "external",
          "summary": "https://go.dev/cl/767220",
          "url": "https://go.dev/cl/767220"
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        {
          "category": "external",
          "summary": "https://go.dev/issue/78760",
          "url": "https://go.dev/issue/78760"
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        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8",
          "url": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8"
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        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-5026",
          "url": "https://pkg.go.dev/vuln/GO-2026-5026"
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          "date": "2026-08-25T18:36:11+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:59549"
        },
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            "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",
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      ],
      "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"
    }
  ]
}



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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.

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Detection rules are retrieved from Rulezet.

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