RHSA-2026:42946

Vulnerability from csaf_redhat - Published: 2026-07-21 20:13 - Updated: 2026-10-30 00:49
Summary
Red Hat Security Advisory: rhc-worker-playbook security, bug fix, and enhancement update
Severity
Important
Notes
Topic: An update for rhc-worker-playbook 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: A worker for yggdrasil that receives Ansible playbooks and executes them against the local host. Security Fix(es): * net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME (CVE-2026-33811) * crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries (CVE-2026-27145) Bug Fix(es) and Enhancement(s): * Update Ansible dependencies (ansible-runner, collections) [10.2.z] (JIRA:RHEL-208712) 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 local privilege escalation vulnerability was found in the ansible.posix authorized_key module. The module's keyfile() function uses os.chown() instead of os.lchown() and opens files without O_NOFOLLOW when managing SSH authorized keys. An unprivileged local user can pre-stage symbolic links in their ~/.ssh directory to redirect file ownership changes to arbitrary system paths when an operator runs the authorized_key task as root, leading to local privilege escalation.

CWE-59 - Improper Link Resolution Before File Access ('Link Following')
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-10.2.Z:rhc-worker-playbook-0:0.2.10-1.el10_2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:rhc-worker-playbook-0:0.2.10-1.el10_2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:rhc-worker-playbook-0:0.2.10-1.el10_2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:rhc-worker-playbook-0:0.2.10-1.el10_2.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:rhc-worker-playbook-0:0.2.10-1.el10_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:rhc-worker-playbook-debuginfo-0:0.2.10-1.el10_2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:rhc-worker-playbook-debuginfo-0:0.2.10-1.el10_2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:rhc-worker-playbook-debuginfo-0:0.2.10-1.el10_2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:rhc-worker-playbook-debuginfo-0:0.2.10-1.el10_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:rhc-worker-playbook-debugsource-0:0.2.10-1.el10_2.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:rhc-worker-playbook-debugsource-0:0.2.10-1.el10_2.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:rhc-worker-playbook-debugsource-0:0.2.10-1.el10_2.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.2.Z:rhc-worker-playbook-debugsource-0:0.2.10-1.el10_2.x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important

A flaw was found in the `crypto/x509` package of `golang`. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by presenting a specially crafted X.509 certificate with a large number of DNS Subject Alternative Name (SAN) entries. The certificate verification process, specifically the `VerifyHostname` function, incurs excessive computational overhead due to repeated string operations when processing these entries. This can lead to a significant performance degradation or unresponsiveness of systems validating such certificates.

CWE-606 - Unchecked Input for Loop Condition
Affected products
Fixed 13 products, the same list as for CVE-2026-11837
Threats
Impact Important

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
Fixed 13 products, the same list as for CVE-2026-11837
Threats
Impact Important

A flaw was found in the Golang MIME (Multipurpose Internet Mail Extensions) package. A remote attacker could exploit this vulnerability by sending a maliciously-crafted MIME header containing many invalid encoded-words. This could lead to excessive CPU consumption, resulting in a Denial of Service (DoS) for the affected system.

CWE-1050 - Excessive Platform Resource Consumption within a Loop
Affected products
Fixed 13 products, the same list as for CVE-2026-11837
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:42946 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2467822 external
https://bugzilla.redhat.com/show_bug.cgi?id=2484207 external
https://issues.redhat.com/browse/RHEL-208712 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2026-11837 self
https://bugzilla.redhat.com/show_bug.cgi?id=2487424 external
https://www.cve.org/CVERecord?id=CVE-2026-11837 external
https://nvd.nist.gov/vuln/detail/CVE-2026-11837 external
https://access.redhat.com/security/cve/CVE-2026-27145 self
https://bugzilla.redhat.com/show_bug.cgi?id=2484207 external
https://www.cve.org/CVERecord?id=CVE-2026-27145 external
https://nvd.nist.gov/vuln/detail/CVE-2026-27145 external
https://go.dev/cl/783621 external
https://go.dev/issue/79694 external
https://groups.google.com/g/golang-announce/c/tKs… external
https://pkg.go.dev/vuln/GO-2026-5037 external
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-2026-42504 self
https://bugzilla.redhat.com/show_bug.cgi?id=2484204 external
https://www.cve.org/CVERecord?id=CVE-2026-42504 external
https://nvd.nist.gov/vuln/detail/CVE-2026-42504 external
https://go.dev/cl/774481 external
https://go.dev/issue/79217 external
https://pkg.go.dev/vuln/GO-2026-5038 external
Acknowledgments

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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Valentino Paulon"
          ]
        }
      ],
      "cve": "CVE-2026-11837",
      "cwe": {
        "id": "CWE-59",
        "name": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)"
      },
      "discovery_date": "2026-06-07T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2487424"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A local privilege escalation vulnerability was found in the ansible.posix authorized_key module. The module\u0027s keyfile() function uses os.chown() instead of os.lchown() and opens files without O_NOFOLLOW when managing SSH authorized keys. An unprivileged local user can pre-stage symbolic links in their ~/.ssh directory to redirect file ownership changes to arbitrary system paths when an operator runs the authorized_key task as root, leading to local privilege escalation.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "ansible-collection-ansible-posix: ansible.posix authorized_key: local privilege escalation via symlink-following chown",
          "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": {
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-11837"
        },
        {
          "category": "external",
          "summary": "RHBZ#2487424",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2487424"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-11837",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-11837"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-11837",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-11837"
        }
      ],
      "release_date": "2026-06-10T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-21T20:13:36+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-2026:42946"
        },
        {
          "category": "workaround",
          "details": "The following practices would help for avoiding exposure and mitigate this flaw:\n\n1) Do not run the ansible.posix authorized_key module with elevated privileges against untrusted user accounts. \n2) Validate that target user home directories do not contain unexpected symbolic links before running playbooks.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.3,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
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      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "ansible-collection-ansible-posix: ansible.posix authorized_key: local privilege escalation via symlink-following chown"
    },
    {
      "cve": "CVE-2026-27145",
      "cwe": {
        "id": "CWE-606",
        "name": "Unchecked Input for Loop Condition"
      },
      "discovery_date": "2026-06-02T23:01:08.992540+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2484207"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the `crypto/x509` package of `golang`. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by presenting a specially crafted X.509 certificate with a large number of DNS Subject Alternative Name (SAN) entries. The certificate verification process, specifically the `VerifyHostname` function, incurs excessive computational overhead due to repeated string operations when processing these entries. This can lead to a significant performance degradation or unresponsiveness of systems validating such certificates.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "A flaw was found in the Go standard library crypto/x509 package. When verifying a TLS certificate hostname, VerifyHostname processed each DNS Subject Alternative Name (SAN) entry in a loop and repeatedly split the candidate hostname on \".\" characters. For certificates with a very large DNS SAN list, CPU use could grow quadratically with the number of SAN entries and hostname labels. Because hostname verification runs before the certificate chain is built, this overhead can occur even when the certificate is not trusted.\n\nRed Hat rates this issue as Important. It affects Red Hat products that include the Go standard library crypto/x509 code from an affected Go toolchain version (before Go 1.25.11, or from Go 1.26.0 through Go 1.26.3). Applications and container images built with a fixed Go release (1.25.11 or later, or 1.26.4 or later) are not affected. Community distributions such as Fedora are also affected.\n\nUpstream fix: Go 1.25.11 and Go 1.26.4 (GO-2026-5037).",
          "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": {
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          "url": "https://access.redhat.com/security/cve/CVE-2026-27145"
        },
        {
          "category": "external",
          "summary": "RHBZ#2484207",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2484207"
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        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-27145",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-27145"
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        {
          "category": "external",
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          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27145"
        },
        {
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          "summary": "https://go.dev/cl/783621",
          "url": "https://go.dev/cl/783621"
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        {
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          "summary": "https://go.dev/issue/79694",
          "url": "https://go.dev/issue/79694"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw",
          "url": "https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw"
        },
        {
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          "summary": "https://pkg.go.dev/vuln/GO-2026-5037",
          "url": "https://pkg.go.dev/vuln/GO-2026-5037"
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          "url": "https://access.redhat.com/errata/RHSA-2026:42946"
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        {
          "category": "workaround",
          "details": "A flaw was found in the Go standard library crypto/x509 package. When verifying a TLS certificate hostname, VerifyHostname processed each DNS Subject Alternative Name (SAN) entry in a loop and repeatedly split the candidate hostname on \".\" characters. For certificates with a very large DNS SAN list, CPU use could grow quadratically with the number of SAN entries and hostname labels. Because hostname verification runs before the certificate chain is built, this overhead can occur even when the certificate is not trusted.\n\nRed Hat rates this issue as Important. It affects Red Hat products that include the Go standard library crypto/x509 code from an affected Go toolchain version (before Go 1.25.11, or from Go 1.26.0 through Go 1.26.3). Applications and container images built with a fixed Go release (1.25.11 or later, or 1.26.4 or later) are not affected. Community distributions such as Fedora are also affected.\n\nUpstream fix: Go 1.25.11 and Go 1.26.4 (GO-2026-5037).",
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            "baseScore": 7.5,
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            "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",
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      ],
      "title": "crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries"
    },
    {
      "cve": "CVE-2026-33811",
      "cwe": {
        "id": "CWE-1341",
        "name": "Multiple Releases of Same Resource or Handle"
      },
      "discovery_date": "2026-05-07T20:01:34.913869+00:00",
      "ids": [
        {
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          "text": "2467822"
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        {
          "category": "description",
          "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"
        },
        {
          "category": "summary",
          "text": "net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is an Important denial of service vulnerability in the Go `net` package, affecting applications configured to use the `cgo` DNS resolver. A remote attacker could trigger a double-free memory error by providing a very long CNAME response, leading to a crash of the vulnerable application and impacting service 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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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-33811"
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          "summary": "https://go.dev/cl/767860",
          "url": "https://go.dev/cl/767860"
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          "summary": "https://go.dev/issue/78803",
          "url": "https://go.dev/issue/78803"
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        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M",
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        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-4981",
          "url": "https://pkg.go.dev/vuln/GO-2026-4981"
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      "release_date": "2026-05-07T19:41:19.285000+00:00",
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          "date": "2026-07-21T20:13:36+00:00",
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      "title": "net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME"
    },
    {
      "cve": "CVE-2026-42504",
      "cwe": {
        "id": "CWE-1050",
        "name": "Excessive Platform Resource Consumption within a Loop"
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      "discovery_date": "2026-06-02T23:01:00.320527+00:00",
      "ids": [
        {
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        {
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          "text": "A flaw was found in the Golang MIME (Multipurpose Internet Mail Extensions) package. A remote attacker could exploit this vulnerability by sending a maliciously-crafted MIME header containing many invalid encoded-words. This could lead to excessive CPU consumption, resulting in a Denial of Service (DoS) for the affected system.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is rated as an Important severity flaw. A remote attacker could trigger a Denial of Service by sending a crafted MIME header with numerous invalid encoded-words to an application utilizing the affected Golang MIME package. This could lead to excessive CPU consumption on the system processing the malformed header, impacting service 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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            "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": [
            "AppStream-10.2.Z:rhc-worker-playbook-0:0.2.10-1.el10_2.aarch64",
            "AppStream-10.2.Z:rhc-worker-playbook-0:0.2.10-1.el10_2.ppc64le",
            "AppStream-10.2.Z:rhc-worker-playbook-0:0.2.10-1.el10_2.s390x",
            "AppStream-10.2.Z:rhc-worker-playbook-0:0.2.10-1.el10_2.src",
            "AppStream-10.2.Z:rhc-worker-playbook-0:0.2.10-1.el10_2.x86_64",
            "AppStream-10.2.Z:rhc-worker-playbook-debuginfo-0:0.2.10-1.el10_2.aarch64",
            "AppStream-10.2.Z:rhc-worker-playbook-debuginfo-0:0.2.10-1.el10_2.ppc64le",
            "AppStream-10.2.Z:rhc-worker-playbook-debuginfo-0:0.2.10-1.el10_2.s390x",
            "AppStream-10.2.Z:rhc-worker-playbook-debuginfo-0:0.2.10-1.el10_2.x86_64",
            "AppStream-10.2.Z:rhc-worker-playbook-debugsource-0:0.2.10-1.el10_2.aarch64",
            "AppStream-10.2.Z:rhc-worker-playbook-debugsource-0:0.2.10-1.el10_2.ppc64le",
            "AppStream-10.2.Z:rhc-worker-playbook-debugsource-0:0.2.10-1.el10_2.s390x",
            "AppStream-10.2.Z:rhc-worker-playbook-debugsource-0:0.2.10-1.el10_2.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header"
    }
  ]
}



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