RHSA-2026:23262

Vulnerability from csaf_redhat - Published: 2026-06-04 12:39 - Updated: 2026-06-18 20:03
Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs: golang1.25: * golang1.25-1.25.11-2.hum1 (aarch64, x86_64) * golang1.25-bin-1.25.11-2.hum1 (aarch64, x86_64) * golang1.25-docs-1.25.11-2.hum1 (noarch) * golang1.25-misc-1.25.11-2.hum1 (noarch) * golang1.25-src-1.25.11-2.hum1 (noarch) * golang1.25-tests-1.25.11-2.hum1 (noarch) * golang1.25-1.25.11-2.hum1.src (src)
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 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.

CWE-1341 - Multiple Releases of Same Resource or Handle
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:golang1-25-main@aarch64
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:golang1-25-main@noarch
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:golang1-25-main@src
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:golang1-25-main@x86_64
Vendor Fix fix
Threats
Impact Important

A flaw was found in the `idna` package, specifically within the `golang.org/x/net/idna` component. This vulnerability allows for privilege escalation due to incorrect processing of Punycode-encoded labels. An attacker could craft a malicious Punycode label that, when initially checked, appears safe but then decodes to a restricted ASCII hostname, bypassing security controls and gaining unauthorized access.

CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:golang1-25-main@aarch64
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:golang1-25-main@noarch
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:golang1-25-main@src
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:golang1-25-main@x86_64
Vendor Fix fix
Threats
Impact Important

A flaw was found in html/template. A trusted template author could craft a script tag with an empty or whitespace-only 'type' attribute. This vulnerability causes the template engine to incorrectly escape data passed into the script block, potentially leading to cross-site scripting (XSS). An attacker could leverage this to execute arbitrary client-side scripts in a user's browser.

CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:golang1-25-main@aarch64
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:golang1-25-main@noarch
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:golang1-25-main@src
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:golang1-25-main@x86_64
Vendor Fix fix
Workaround
Threats
Impact Moderate

A flaw was found in the `golang.org/x/crypto/ssh` component. This vulnerability allows a remote attacker to bypass source-address validation in certain SSH server configurations. By providing a callback type other than a public key, an attacker can circumvent security checks, potentially leading to unauthorized access.

CWE-303 - Incorrect Implementation of Authentication Algorithm
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:golang1-25-main@aarch64
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:golang1-25-main@noarch
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:golang1-25-main@src
Vendor Fix fix
Unresolved product id: Red Hat Hardened Images:golang1-25-main@x86_64
Vendor Fix fix
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:23262 self
https://images.redhat.com/ external
https://access.redhat.com/security/cve/CVE-2026-42504 external
https://access.redhat.com/security/updates/classi… external
https://access.redhat.com/security/cve/CVE-2026-27145 external
https://access.redhat.com/security/cve/CVE-2026-42507 external
https://access.redhat.com/security/cve/CVE-2026-39821 external
https://access.redhat.com/security/cve/CVE-2026-46595 external
https://access.redhat.com/security/cve/CVE-2026-39826 external
https://access.redhat.com/security/cve/CVE-2026-33811 external
https://access.redhat.com/security/cve/CVE-2026-39820 external
https://access.redhat.com/security/cve/CVE-2026-39836 external
https://access.redhat.com/security/cve/CVE-2026-39825 external
https://access.redhat.com/security/cve/CVE-2026-39823 external
https://access.redhat.com/security/cve/CVE-2026-33814 external
https://access.redhat.com/security/cve/CVE-2026-42508 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-2026-39826 self
https://bugzilla.redhat.com/show_bug.cgi?id=2467826 external
https://www.cve.org/CVERecord?id=CVE-2026-39826 external
https://nvd.nist.gov/vuln/detail/CVE-2026-39826 external
https://go.dev/cl/771180 external
https://go.dev/issue/78981 external
https://pkg.go.dev/vuln/GO-2026-4980 external
https://access.redhat.com/security/cve/CVE-2026-46595 self
https://bugzilla.redhat.com/show_bug.cgi?id=2480689 external
https://www.cve.org/CVERecord?id=CVE-2026-46595 external
https://nvd.nist.gov/vuln/detail/CVE-2026-46595 external
https://go.dev/cl/781642 external
https://go.dev/issue/79570 external
https://groups.google.com/g/golang-announce/c/a08… external
https://pkg.go.dev/vuln/GO-2026-5023 external

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        "name": "Multiple Releases of Same Resource or Handle"
      },
      "discovery_date": "2026-05-07T20:01:34.913869+00:00",
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          "text": "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.",
          "title": "Vulnerability description"
        },
        {
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          "text": "net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME",
          "title": "Vulnerability summary"
        },
        {
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      "remediations": [
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            "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"
          },
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            "Red Hat Hardened Images:golang1-25-main@src",
            "Red Hat Hardened Images:golang1-25-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME"
    },
    {
      "cve": "CVE-2026-39821",
      "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",
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        {
          "category": "description",
          "text": "A flaw was found in the `idna` package, specifically within the `golang.org/x/net/idna` component. This vulnerability allows for privilege escalation due to incorrect processing of Punycode-encoded labels. An attacker could craft a malicious Punycode label that, when initially checked, appears safe but then decodes to a restricted ASCII hostname, bypassing security controls and gaining unauthorized access.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "golang.org/x/net/idna: golang: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing",
          "title": "Vulnerability summary"
        },
        {
          "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 Hardened Images:golang1-25-main@aarch64",
          "Red Hat Hardened Images:golang1-25-main@noarch",
          "Red Hat Hardened Images:golang1-25-main@src",
          "Red Hat Hardened Images:golang1-25-main@x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-39821"
        },
        {
          "category": "external",
          "summary": "RHBZ#2480756",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480756"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-39821",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-39821"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-39821",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39821"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/767220",
          "url": "https://go.dev/cl/767220"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/78760",
          "url": "https://go.dev/issue/78760"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8",
          "url": "https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-5026",
          "url": "https://pkg.go.dev/vuln/GO-2026-5026"
        }
      ],
      "release_date": "2026-05-22T15:01:21.462000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-06-04T12:39:22+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:golang1-25-main@aarch64",
            "Red Hat Hardened Images:golang1-25-main@noarch",
            "Red Hat Hardened Images:golang1-25-main@src",
            "Red Hat Hardened Images:golang1-25-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:23262"
        }
      ],
      "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 Hardened Images:golang1-25-main@aarch64",
            "Red Hat Hardened Images:golang1-25-main@noarch",
            "Red Hat Hardened Images:golang1-25-main@src",
            "Red Hat Hardened Images:golang1-25-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "golang.org/x/net/idna: golang: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing"
    },
    {
      "cve": "CVE-2026-39826",
      "cwe": {
        "id": "CWE-1289",
        "name": "Improper Validation of Unsafe Equivalence in Input"
      },
      "discovery_date": "2026-05-07T20:01:46.305827+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2467826"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in html/template. A trusted template author could craft a script tag with an empty or whitespace-only \u0027type\u0027 attribute. This vulnerability causes the template engine to incorrectly escape data passed into the script block, potentially leading to cross-site scripting (XSS). An attacker could leverage this to execute arbitrary client-side scripts in a user\u0027s browser.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "html/template: golang: html/template: Cross-site scripting due to incorrect script tag escaping",
          "title": "Vulnerability summary"
        },
        {
          "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 Hardened Images:golang1-25-main@aarch64",
          "Red Hat Hardened Images:golang1-25-main@noarch",
          "Red Hat Hardened Images:golang1-25-main@src",
          "Red Hat Hardened Images:golang1-25-main@x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-39826"
        },
        {
          "category": "external",
          "summary": "RHBZ#2467826",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467826"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-39826",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-39826"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-39826",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39826"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/771180",
          "url": "https://go.dev/cl/771180"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/78981",
          "url": "https://go.dev/issue/78981"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M",
          "url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-4980",
          "url": "https://pkg.go.dev/vuln/GO-2026-4980"
        }
      ],
      "release_date": "2026-05-07T19:41:19.138000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-06-04T12:39:22+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:golang1-25-main@aarch64",
            "Red Hat Hardened Images:golang1-25-main@noarch",
            "Red Hat Hardened Images:golang1-25-main@src",
            "Red Hat Hardened Images:golang1-25-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:23262"
        },
        {
          "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 Hardened Images:golang1-25-main@aarch64",
            "Red Hat Hardened Images:golang1-25-main@noarch",
            "Red Hat Hardened Images:golang1-25-main@src",
            "Red Hat Hardened Images:golang1-25-main@x86_64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:golang1-25-main@aarch64",
            "Red Hat Hardened Images:golang1-25-main@noarch",
            "Red Hat Hardened Images:golang1-25-main@src",
            "Red Hat Hardened Images:golang1-25-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "html/template: golang: html/template: Cross-site scripting due to incorrect script tag escaping"
    },
    {
      "cve": "CVE-2026-46595",
      "cwe": {
        "id": "CWE-303",
        "name": "Incorrect Implementation of Authentication Algorithm"
      },
      "discovery_date": "2026-05-22T04:01:52.215134+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2480689"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the `golang.org/x/crypto/ssh` component. This vulnerability allows a remote attacker to bypass source-address validation in certain SSH server configurations. By providing a callback type other than a public key, an attacker can circumvent security checks, potentially leading to unauthorized access.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Authorization bypass due to skipped source-address validation",
          "title": "Vulnerability summary"
        },
        {
          "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 Hardened Images:golang1-25-main@aarch64",
          "Red Hat Hardened Images:golang1-25-main@noarch",
          "Red Hat Hardened Images:golang1-25-main@src",
          "Red Hat Hardened Images:golang1-25-main@x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-46595"
        },
        {
          "category": "external",
          "summary": "RHBZ#2480689",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480689"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-46595",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-46595"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-46595",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46595"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/781642",
          "url": "https://go.dev/cl/781642"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/79570",
          "url": "https://go.dev/issue/79570"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/a082jnz-LvI",
          "url": "https://groups.google.com/g/golang-announce/c/a082jnz-LvI"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-5023",
          "url": "https://pkg.go.dev/vuln/GO-2026-5023"
        }
      ],
      "release_date": "2026-05-22T02:31:27.894000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-06-04T12:39:22+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:golang1-25-main@aarch64",
            "Red Hat Hardened Images:golang1-25-main@noarch",
            "Red Hat Hardened Images:golang1-25-main@src",
            "Red Hat Hardened Images:golang1-25-main@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:23262"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:golang1-25-main@aarch64",
            "Red Hat Hardened Images:golang1-25-main@noarch",
            "Red Hat Hardened Images:golang1-25-main@src",
            "Red Hat Hardened Images:golang1-25-main@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Authorization bypass due to skipped source-address validation"
    }
  ]
}


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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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