RHSA-2026:37436

Vulnerability from csaf_redhat - Published: 2026-07-09 19:54 - Updated: 2026-08-03 11:21
Summary
Red Hat Security Advisory: golang security, bug fix, and enhancement update
Severity
Important
Notes
Topic: An update for golang is now available for Red Hat Enterprise Linux 10. 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: The golang packages provide the Go programming language compiler. Security Fix(es): * golang.org/x/net/idna: golang: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821) * os: golang: Go os.Root: Symlink following vulnerability allows directory traversal (CVE-2026-39822) Bug Fix(es) and Enhancement(s): * Update Go to version 1.26.5+1 [rhel-10.2.z] (JIRA:RHEL-193473) 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-10.2.Z:go-toolset-0:1.26.5-1.el10_2.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:go-toolset-0:1.26.5-1.el10_2.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:go-toolset-0:1.26.5-1.el10_2.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:go-toolset-0:1.26.5-1.el10_2.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-0:1.26.5-1.el10_2.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-0:1.26.5-1.el10_2.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-0:1.26.5-1.el10_2.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-0:1.26.5-1.el10_2.src
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-0:1.26.5-1.el10_2.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-bin-0:1.26.5-1.el10_2.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-bin-0:1.26.5-1.el10_2.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-bin-0:1.26.5-1.el10_2.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-bin-0:1.26.5-1.el10_2.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-docs-0:1.26.5-1.el10_2.noarch
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-misc-0:1.26.5-1.el10_2.noarch
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-race-0:1.26.5-1.el10_2.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-race-0:1.26.5-1.el10_2.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-race-0:1.26.5-1.el10_2.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-race-0:1.26.5-1.el10_2.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-src-0:1.26.5-1.el10_2.noarch
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-tests-0:1.26.5-1.el10_2.noarch
Vendor Fix fix
Workaround
Threats
Impact Important

A flaw was found in the `os.Root` functionality of Go on Unix systems. This vulnerability allows an attacker to bypass intended directory restrictions by crafting a path that ends with a symbolic link and a trailing slash. When a file is opened in `os.Root` with such a path, the symbolic link is improperly followed, potentially leading to access to locations outside of the defined root directory. This could result in information disclosure or unauthorized file system access.

CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-10.2.Z:go-toolset-0:1.26.5-1.el10_2.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:go-toolset-0:1.26.5-1.el10_2.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:go-toolset-0:1.26.5-1.el10_2.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:go-toolset-0:1.26.5-1.el10_2.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-0:1.26.5-1.el10_2.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-0:1.26.5-1.el10_2.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-0:1.26.5-1.el10_2.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-0:1.26.5-1.el10_2.src
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-0:1.26.5-1.el10_2.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-bin-0:1.26.5-1.el10_2.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-bin-0:1.26.5-1.el10_2.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-bin-0:1.26.5-1.el10_2.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-bin-0:1.26.5-1.el10_2.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-docs-0:1.26.5-1.el10_2.noarch
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-misc-0:1.26.5-1.el10_2.noarch
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-race-0:1.26.5-1.el10_2.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-race-0:1.26.5-1.el10_2.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-race-0:1.26.5-1.el10_2.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-race-0:1.26.5-1.el10_2.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-src-0:1.26.5-1.el10_2.noarch
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-tests-0:1.26.5-1.el10_2.noarch
Vendor Fix fix
Workaround
Threats
Impact Important

A flaw was found in the `crypto/tls` package in Go. Handshakes utilizing Encrypted Client Hello (ECH) could lead to de-anonymization by a passive network observer. This is due to the disclosure of pre-shared key identities within the unencrypted client hello, allowing an attacker to potentially link connections.

CWE-201 - Insertion of Sensitive Information Into Sent Data
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-10.2.Z:go-toolset-0:1.26.5-1.el10_2.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:go-toolset-0:1.26.5-1.el10_2.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:go-toolset-0:1.26.5-1.el10_2.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:go-toolset-0:1.26.5-1.el10_2.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-0:1.26.5-1.el10_2.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-0:1.26.5-1.el10_2.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-0:1.26.5-1.el10_2.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-0:1.26.5-1.el10_2.src
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-0:1.26.5-1.el10_2.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-bin-0:1.26.5-1.el10_2.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-bin-0:1.26.5-1.el10_2.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-bin-0:1.26.5-1.el10_2.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-bin-0:1.26.5-1.el10_2.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-docs-0:1.26.5-1.el10_2.noarch
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-misc-0:1.26.5-1.el10_2.noarch
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-race-0:1.26.5-1.el10_2.aarch64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-race-0:1.26.5-1.el10_2.ppc64le
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-race-0:1.26.5-1.el10_2.s390x
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-race-0:1.26.5-1.el10_2.x86_64
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-src-0:1.26.5-1.el10_2.noarch
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:golang-tests-0:1.26.5-1.el10_2.noarch
Vendor Fix fix
Workaround
Threats
Impact Moderate
References
URL Category
https://access.redhat.com/errata/RHSA-2026:37436 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=2498152 external
https://issues.redhat.com/browse/RHEL-193473 external
https://security.access.redhat.com/data/csaf/v2/a… self
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-2026-39822 self
https://bugzilla.redhat.com/show_bug.cgi?id=2498152 external
https://www.cve.org/CVERecord?id=CVE-2026-39822 external
https://nvd.nist.gov/vuln/detail/CVE-2026-39822 external
https://go.dev/cl/797880 external
https://go.dev/issue/79005 external
https://groups.google.com/g/golang-announce/c/Orm… external
https://pkg.go.dev/vuln/GO-2026-4970 external
https://access.redhat.com/security/cve/CVE-2026-42505 self
https://bugzilla.redhat.com/show_bug.cgi?id=2498138 external
https://www.cve.org/CVERecord?id=CVE-2026-42505 external
https://nvd.nist.gov/vuln/detail/CVE-2026-42505 external
https://go.dev/cl/775960 external
https://go.dev/issue/79282 external
https://pkg.go.dev/vuln/GO-2026-5856 external

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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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          "title": "Statement"
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          "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": "golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing"
    },
    {
      "cve": "CVE-2026-39822",
      "cwe": {
        "id": "CWE-59",
        "name": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)"
      },
      "discovery_date": "2026-07-08T17:01:53.592869+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2498152"
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        {
          "category": "description",
          "text": "A flaw was found in the `os.Root` functionality of Go on Unix systems. This vulnerability allows an attacker to bypass intended directory restrictions by crafting a path that ends with a symbolic link and a trailing slash. When a file is opened in `os.Root` with such a path, the symbolic link is improperly followed, potentially leading to access to locations outside of the defined root directory. This could result in information disclosure or unauthorized file system access.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "golang: Go os.Root: Symlink following vulnerability allows directory traversal",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A flaw was found in Go\u0027s os.Root implementation. On Unix systems, `os.Root.Open()` improperly follows symlinks to locations outside the root directory when the path ends with a trailing slash (e.g., root.Open(\"symlink/\")). This is because `openat()` with `O_NOFOLLOW` does not prevent symlink resolution when the path has a trailing /. An attacker able to create symlinks within an os.Root directory could use this to read or write files outside the intended root. The os.Root API was introduced in Go 1.24. Go versions prior to 1.24 are not affected. This issue is fixed in Go 1.25.12 and Go 1.26.5.\n\nThe following symbols are affected:\n* `OpenInRoot`: Opens a file or directory within an `os.Root`.\n* `Root.Create`: Creates a file inside an `os.Root`.\n* `Root.Open`: Opens a path relative to an `os.Root`.\n* `Root.OpenFile`: Opens a file with specified flags and permissions inside an `os.Root`.\n* `Root.OpenRoot`: Opens a sub-root directory from an `os.Root`.\n* `Root.ReadFile`: Reads a file inside an `os.Root`.\n* `Root.WriteFile`: Writes a file inside an `os.Root`.",
          "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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          "date": "2026-07-09T19:54:04+00:00",
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      "title": "golang: Go os.Root: Symlink following vulnerability allows directory traversal"
    },
    {
      "cve": "CVE-2026-42505",
      "cwe": {
        "id": "CWE-201",
        "name": "Insertion of Sensitive Information Into Sent Data"
      },
      "discovery_date": "2026-07-08T17:01:05.490547+00:00",
      "ids": [
        {
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          "text": "2498138"
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          "text": "A flaw was found in the `crypto/tls` package in Go. Handshakes utilizing Encrypted Client Hello (ECH) could lead to de-anonymization by a passive network observer. This is due to the disclosure of pre-shared key identities within the unencrypted client hello, allowing an attacker to potentially link connections.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "crypto/tls: golang: Go crypto/tls: Information disclosure in Encrypted Client Hello",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Moderate-impact information disclosure flaw in the Go `crypto/tls` package allows a passive network observer to de-anonymize connections utilizing Encrypted Client Hello (ECH). The vulnerability stems from the unintentional exposure of pre-shared key identities within the unencrypted client hello, potentially enabling an attacker to link previously anonymous connections. This primarily affects the privacy of communications rather than integrity or availability.",
          "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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      "references": [
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-42505"
        },
        {
          "category": "external",
          "summary": "RHBZ#2498138",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2498138"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-42505",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-42505"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42505",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42505"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/775960",
          "url": "https://go.dev/cl/775960"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/79282",
          "url": "https://go.dev/issue/79282"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc",
          "url": "https://groups.google.com/g/golang-announce/c/OrmQE_Yp5Sc"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-5856",
          "url": "https://pkg.go.dev/vuln/GO-2026-5856"
        }
      ],
      "release_date": "2026-07-08T15:46:33.407000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-09T19:54:04+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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          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:37436"
        },
        {
          "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.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "crypto/tls: golang: Go crypto/tls: Information disclosure in Encrypted Client Hello"
    }
  ]
}



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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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