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RHSA-2026:51112

Vulnerability from csaf_redhat - Published: 2026-08-06 17:05 - Updated: 2026-09-15 02:12
Summary
Red Hat Security Advisory: grafana security update
Severity
Important
Notes
Topic: An update for grafana is now available for Red Hat Enterprise Linux 9.6 Extended Update Support. 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: Grafana is an open source, feature rich metrics dashboard and graph editor for Graphite, InfluxDB & OpenTSDB. 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) * golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via HTML parsing bypass (CVE-2026-27136) * golang.org/x/net/html: golang.org/x/net/html: Arbitrary code execution via Cross-Site Scripting (CVE-2026-25681) 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/html. A remote attacker could exploit this vulnerability by providing specially crafted HTML. When this arbitrary HTML is parsed and rendered, it can result in an unexpected HTML tree, bypassing input sanitization. This can be leveraged to execute Cross-Site Scripting (XSS) attacks, potentially leading to arbitrary code execution in applications that use the affected component.

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-0:10.2.6-22.el9_6.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-0:10.2.6-22.el9_6.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-0:10.2.6-22.el9_6.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-0:10.2.6-22.el9_6.src
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-0:10.2.6-22.el9_6.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-debuginfo-0:10.2.6-22.el9_6.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-debuginfo-0:10.2.6-22.el9_6.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-debuginfo-0:10.2.6-22.el9_6.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-debuginfo-0:10.2.6-22.el9_6.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-debugsource-0:10.2.6-22.el9_6.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-debugsource-0:10.2.6-22.el9_6.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-debugsource-0:10.2.6-22.el9_6.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-debugsource-0:10.2.6-22.el9_6.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-selinux-0:10.2.6-22.el9_6.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-selinux-0:10.2.6-22.el9_6.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-selinux-0:10.2.6-22.el9_6.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-9.6.0.Z.EUS:grafana-selinux-0:10.2.6-22.el9_6.x86_64
Vendor Fix fix
Workaround
Threats
Impact Important

A flaw was found in golang.org/x/net/html. When arbitrary HTML is parsed and then rendered, it can result in an unexpected HTML tree. This allows an attacker to bypass HTML sanitization mechanisms, leading to Cross-Site Scripting (XSS) attacks in applications. Such attacks can result in information disclosure or arbitrary code execution.

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected products
Fixed 17 products, the same list as for CVE-2026-25681
Threats
Impact Important

A flaw was found in the `net/mail` package of the Go programming language. An attacker could provide specially crafted inputs to the `ParseAddress`, `ParseAddressList`, or `ParseDate` functions. This could lead to excessive consumption of CPU and memory resources, resulting in a Denial of Service (DoS) for applications processing these inputs.

CWE-606 - Unchecked Input for Loop Condition
Affected products
Fixed 17 products, the same list as for CVE-2026-25681
Threats
Impact Important

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
Fixed 17 products, the same list as for CVE-2026-25681
Threats
Impact Important

A flaw was found in the `net/mail` package within the Go standard library. A remote attacker could provide specially crafted, pathological email addresses. When these malformed email addresses are parsed by the `consumePhrase` function, it can lead to excessive resource consumption due to quadratic string concatenation, resulting in a Denial of Service (DoS) condition.

CWE-1046 - Creation of Immutable Text Using String Concatenation
Affected products
Fixed 17 products, the same list as for CVE-2026-25681
Threats
Impact Important

A flaw was found in golang.org/x/net/html. This vulnerability allows an attacker to manipulate how HTML is processed and displayed. By providing specially crafted HTML, an attacker can cause an unexpected structure in the rendered output. This can lead to Cross-Site Scripting (XSS) attacks, where malicious scripts are executed in a user's web browser, potentially compromising user data or taking control of their session.

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Affected products
Fixed 17 products, the same list as for CVE-2026-25681
Threats
Impact Moderate
References
URL Category
https://access.redhat.com/errata/RHSA-2026:51112 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2480756 external
https://bugzilla.redhat.com/show_bug.cgi?id=2480757 external
https://bugzilla.redhat.com/show_bug.cgi?id=2480761 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2026-25681 self
https://bugzilla.redhat.com/show_bug.cgi?id=2480761 external
https://www.cve.org/CVERecord?id=CVE-2026-25681 external
https://nvd.nist.gov/vuln/detail/CVE-2026-25681 external
https://go.dev/cl/781703 external
https://go.dev/issue/79574 external
https://groups.google.com/g/golang-announce/c/iI-… external
https://pkg.go.dev/vuln/GO-2026-5029 external
https://access.redhat.com/security/cve/CVE-2026-27136 self
https://bugzilla.redhat.com/show_bug.cgi?id=2480757 external
https://www.cve.org/CVERecord?id=CVE-2026-27136 external
https://nvd.nist.gov/vuln/detail/CVE-2026-27136 external
https://go.dev/cl/781685 external
https://go.dev/issue/79575 external
https://pkg.go.dev/vuln/GO-2026-5030 external
https://access.redhat.com/security/cve/CVE-2026-39820 self
https://bugzilla.redhat.com/show_bug.cgi?id=2467820 external
https://www.cve.org/CVERecord?id=CVE-2026-39820 external
https://nvd.nist.gov/vuln/detail/CVE-2026-39820 external
https://go.dev/cl/759940 external
https://go.dev/issue/78566 external
https://groups.google.com/g/golang-announce/c/qcC… external
https://pkg.go.dev/vuln/GO-2026-4986 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://pkg.go.dev/vuln/GO-2026-5026 external
https://access.redhat.com/security/cve/CVE-2026-42499 self
https://bugzilla.redhat.com/show_bug.cgi?id=2467809 external
https://www.cve.org/CVERecord?id=CVE-2026-42499 external
https://nvd.nist.gov/vuln/detail/CVE-2026-42499 external
https://go.dev/cl/771520 external
https://go.dev/issue/78987 external
https://pkg.go.dev/vuln/GO-2026-4977 external
https://access.redhat.com/security/cve/CVE-2026-42502 self
https://bugzilla.redhat.com/show_bug.cgi?id=2480762 external
https://www.cve.org/CVERecord?id=CVE-2026-42502 external
https://nvd.nist.gov/vuln/detail/CVE-2026-42502 external
https://go.dev/cl/781701 external
https://go.dev/issue/79572 external
https://pkg.go.dev/vuln/GO-2026-5027 external

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          "title": "Vulnerability description"
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          "title": "Vulnerability summary"
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          "category": "other",
          "text": "This Important vulnerability in `golang.org/x/net/html` could enable remote attackers to execute Cross-Site Scripting (XSS) attacks, potentially leading to arbitrary code execution. The flaw allows specially crafted HTML to bypass input sanitization during parsing and rendering. Red Hat products are affected if they process untrusted HTML content using the vulnerable component without additional output encoding or robust content security policies.",
          "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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      "title": "net/mail: golang: net/mail: Denial of Service via pathological email address parsing"
    },
    {
      "cve": "CVE-2026-42502",
      "cwe": {
        "id": "CWE-79",
        "name": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)"
      },
      "discovery_date": "2026-05-22T16:01:11.151484+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2480762"
        }
      ],
      "notes": [
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          "category": "description",
          "text": "A flaw was found in golang.org/x/net/html. This vulnerability allows an attacker to manipulate how HTML is processed and displayed. By providing specially crafted HTML, an attacker can cause an unexpected structure in the rendered output. This can lead to Cross-Site Scripting (XSS) attacks, where malicious scripts are executed in a user\u0027s web browser, potentially compromising user data or taking control of their session.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via unexpected HTML tree rendering",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A flaw in golang.org/x/net/html can lead to Cross-Site Scripting (XSS) in applications that parse and render untrusted HTML, even with sanitization attempts. This is due to an unexpected HTML tree structure, allowing malicious scripts to execute in a user\u0027s browser.",
          "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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          "summary": "https://go.dev/issue/79572",
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          "date": "2026-08-06T17:05:48+00:00",
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
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      ],
      "title": "golang.org/x/net/html: golang: golang.org/x/net/html: Cross-Site Scripting via unexpected HTML tree rendering"
    }
  ]
}



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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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