RHSA-2026:42048

Vulnerability from csaf_redhat - Published: 2026-07-20 13:55 - Updated: 2026-07-22 21:22
Summary
Red Hat Security Advisory: Red Hat Web Terminal Operator 1.16.1 release.
Severity
Important
Notes
Topic: Red Hat Web Terminal Operator 1.16.1 has been released.
Details: The Web Terminal provides a way to access a fully in-browser terminal emulator within the OpenShift Console. Command-line tools for interacting with the OpenShift cluster are pre-installed.
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 Go's `crypto/x509` package. A remote attacker could exploit this by presenting a specially crafted certificate chain containing a large number of policy mappings. This inefficient validation process consumes excessive resources, which can lead to a denial of service (DoS) for applications or systems performing certificate validation.

CWE-1050 - Excessive Platform Resource Consumption within a Loop
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-exec-rhel9@sha256:365e1253b8da2ba88ec97ec5b074d16ac46b31fd7eba3baad6587ce8959b11bf_amd64
Vendor Fix fix
Workaround
Product Identifier Version Remediation
Unresolved product id: Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-operator-bundle@sha256:25e450ef9a1bbdb5e6d522a98928c0784c483de40f17ee111e8c32e59c4e78c9_amd64
Workaround
Unresolved product id: Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-rhel9-operator@sha256:f331222fc180e7195d51536dab01692da66ad9049671e034867855dce1e5b656_amd64
Workaround
Unresolved product id: Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-tooling-rhel9@sha256:fefa9980c5021706ccac27d05086359f45109790089e586221c08271b55b1b25_amd64
Workaround
Threats
Impact Moderate

A flaw was found in the internal/syscall/unix package in the Go standard library. If the target of the `Root.Chmod` function is replaced with a symbolic link during execution, specifically after `Root.Chmod` checks the target but before acting, the `chmod` operation will be performed on the file the symbolic link points to. This issue can bypass directory restrictions and lead to unauthorized permission changes on the filesystem.

CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-exec-rhel9@sha256:365e1253b8da2ba88ec97ec5b074d16ac46b31fd7eba3baad6587ce8959b11bf_amd64
Vendor Fix fix
Workaround
Product Identifier Version Remediation
Unresolved product id: Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-operator-bundle@sha256:25e450ef9a1bbdb5e6d522a98928c0784c483de40f17ee111e8c32e59c4e78c9_amd64
Workaround
Unresolved product id: Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-rhel9-operator@sha256:f331222fc180e7195d51536dab01692da66ad9049671e034867855dce1e5b656_amd64
Workaround
Unresolved product id: Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-tooling-rhel9@sha256:fefa9980c5021706ccac27d05086359f45109790089e586221c08271b55b1b25_amd64
Workaround
Threats
Impact Moderate

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 Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-exec-rhel9@sha256:365e1253b8da2ba88ec97ec5b074d16ac46b31fd7eba3baad6587ce8959b11bf_amd64
Vendor Fix fix
Workaround
Product Identifier Version Remediation
Unresolved product id: Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-operator-bundle@sha256:25e450ef9a1bbdb5e6d522a98928c0784c483de40f17ee111e8c32e59c4e78c9_amd64
Workaround
Unresolved product id: Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-rhel9-operator@sha256:f331222fc180e7195d51536dab01692da66ad9049671e034867855dce1e5b656_amd64
Workaround
Unresolved product id: Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-tooling-rhel9@sha256:fefa9980c5021706ccac27d05086359f45109790089e586221c08271b55b1b25_amd64
Workaround
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
Product Identifier Version Remediation
Unresolved product id: Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-exec-rhel9@sha256:365e1253b8da2ba88ec97ec5b074d16ac46b31fd7eba3baad6587ce8959b11bf_amd64
Vendor Fix fix
Workaround
Product Identifier Version Remediation
Unresolved product id: Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-operator-bundle@sha256:25e450ef9a1bbdb5e6d522a98928c0784c483de40f17ee111e8c32e59c4e78c9_amd64
Workaround
Unresolved product id: Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-rhel9-operator@sha256:f331222fc180e7195d51536dab01692da66ad9049671e034867855dce1e5b656_amd64
Workaround
Unresolved product id: Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-tooling-rhel9@sha256:fefa9980c5021706ccac27d05086359f45109790089e586221c08271b55b1b25_amd64
Workaround
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
Product Identifier Version Remediation
Unresolved product id: Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-exec-rhel9@sha256:365e1253b8da2ba88ec97ec5b074d16ac46b31fd7eba3baad6587ce8959b11bf_amd64
Vendor Fix fix
Workaround
Product Identifier Version Remediation
Unresolved product id: Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-operator-bundle@sha256:25e450ef9a1bbdb5e6d522a98928c0784c483de40f17ee111e8c32e59c4e78c9_amd64
Workaround
Unresolved product id: Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-rhel9-operator@sha256:f331222fc180e7195d51536dab01692da66ad9049671e034867855dce1e5b656_amd64
Workaround
Unresolved product id: Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-tooling-rhel9@sha256:fefa9980c5021706ccac27d05086359f45109790089e586221c08271b55b1b25_amd64
Workaround
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:42048 self
https://access.redhat.com/security/cve/CVE-2026-32281 external
https://access.redhat.com/security/cve/CVE-2026-32282 external
https://access.redhat.com/security/cve/CVE-2026-33811 external
https://access.redhat.com/security/cve/CVE-2026-39821 external
https://access.redhat.com/security/cve/CVE-2026-42504 external
https://access.redhat.com/security/updates/classi… external
https://redhat.atlassian.net/browse/WTO-411 external
https://redhat.atlassian.net/browse/WTO-422 external
https://redhat.atlassian.net/browse/WTO-426 external
https://redhat.atlassian.net/browse/WTO-435 external
https://redhat.atlassian.net/browse/WTO-451 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2026-32281 self
https://bugzilla.redhat.com/show_bug.cgi?id=2456333 external
https://www.cve.org/CVERecord?id=CVE-2026-32281 external
https://nvd.nist.gov/vuln/detail/CVE-2026-32281 external
https://go.dev/cl/758061 external
https://go.dev/issue/78281 external
https://groups.google.com/g/golang-announce/c/0uY… external
https://pkg.go.dev/vuln/GO-2026-4946 external
https://access.redhat.com/security/cve/CVE-2026-32282 self
https://bugzilla.redhat.com/show_bug.cgi?id=2456336 external
https://www.cve.org/CVERecord?id=CVE-2026-32282 external
https://nvd.nist.gov/vuln/detail/CVE-2026-32282 external
https://go.dev/cl/763761 external
https://go.dev/issue/78293 external
https://pkg.go.dev/vuln/GO-2026-4864 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-2026-39821 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-2026-42504 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://groups.google.com/g/golang-announce/c/tKs… external
https://pkg.go.dev/vuln/GO-2026-5038 external

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          "text": "This flaw occurs during the validation of otherwise trusted certificate chains that contain a large number of policy mappings, leading to excessive resource consumption. Exploitation requires an attacker to present a specially crafted, yet trusted, certificate chain which would require the attacker has already compromised a trusted certificate root. Red Hat continuously monitors certificate authorities and curates the set which is trusted by default for Red Hat products.",
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          "text": "A flaw was found in the internal/syscall/unix package in the Go standard library. If the target of the `Root.Chmod` function is replaced with a symbolic link during execution, specifically after `Root.Chmod` checks the target but before acting, the `chmod` operation will be performed on the file the symbolic link points to. This issue can bypass directory restrictions and lead to unauthorized permission changes on the filesystem.",
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          "title": "Statement"
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        {
          "category": "workaround",
          "details": "To mitigate this issue, applications can be configured to use the pure Go DNS resolver instead of the `cgo` DNS resolver. This can be achieved by setting the `GODEBUG` environment variable to `netdns=go`. For example, to run a Go application with this mitigation: `GODEBUG=netdns=go /path/to/your/go/application`. This change may require restarting affected applications or services to take effect. Users should verify that this change does not negatively impact DNS resolution for their specific application environment.",
          "product_ids": [
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-exec-rhel9@sha256:365e1253b8da2ba88ec97ec5b074d16ac46b31fd7eba3baad6587ce8959b11bf_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-operator-bundle@sha256:25e450ef9a1bbdb5e6d522a98928c0784c483de40f17ee111e8c32e59c4e78c9_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-rhel9-operator@sha256:f331222fc180e7195d51536dab01692da66ad9049671e034867855dce1e5b656_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-tooling-rhel9@sha256:fefa9980c5021706ccac27d05086359f45109790089e586221c08271b55b1b25_amd64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "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"
          },
          "products": [
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-exec-rhel9@sha256:365e1253b8da2ba88ec97ec5b074d16ac46b31fd7eba3baad6587ce8959b11bf_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-operator-bundle@sha256:25e450ef9a1bbdb5e6d522a98928c0784c483de40f17ee111e8c32e59c4e78c9_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-rhel9-operator@sha256:f331222fc180e7195d51536dab01692da66ad9049671e034867855dce1e5b656_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-tooling-rhel9@sha256:fefa9980c5021706ccac27d05086359f45109790089e586221c08271b55b1b25_amd64"
          ]
        }
      ],
      "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",
      "flags": [
        {
          "label": "vulnerable_code_not_present",
          "product_ids": [
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-operator-bundle@sha256:25e450ef9a1bbdb5e6d522a98928c0784c483de40f17ee111e8c32e59c4e78c9_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-rhel9-operator@sha256:f331222fc180e7195d51536dab01692da66ad9049671e034867855dce1e5b656_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-tooling-rhel9@sha256:fefa9980c5021706ccac27d05086359f45109790089e586221c08271b55b1b25_amd64"
          ]
        }
      ],
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2480756"
        }
      ],
      "notes": [
        {
          "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"
        }
      ],
      "product_status": {
        "fixed": [
          "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-exec-rhel9@sha256:365e1253b8da2ba88ec97ec5b074d16ac46b31fd7eba3baad6587ce8959b11bf_amd64"
        ],
        "known_not_affected": [
          "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-operator-bundle@sha256:25e450ef9a1bbdb5e6d522a98928c0784c483de40f17ee111e8c32e59c4e78c9_amd64",
          "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-rhel9-operator@sha256:f331222fc180e7195d51536dab01692da66ad9049671e034867855dce1e5b656_amd64",
          "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-tooling-rhel9@sha256:fefa9980c5021706ccac27d05086359f45109790089e586221c08271b55b1b25_amd64"
        ]
      },
      "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": "2026-07-20T13:55:42+00:00",
          "details": "To start using the Web Terminal Operator, install the Web Terminal Operator from OpenShift OperatorHub on OpenShift Container Platform 4.21 or higher.",
          "product_ids": [
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-exec-rhel9@sha256:365e1253b8da2ba88ec97ec5b074d16ac46b31fd7eba3baad6587ce8959b11bf_amd64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:42048"
        },
        {
          "category": "workaround",
          "details": "Upgrade to a fixed golang.org/x/net release that includes the idna correction, via updated golang or dependent package rebuilds.",
          "product_ids": [
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-exec-rhel9@sha256:365e1253b8da2ba88ec97ec5b074d16ac46b31fd7eba3baad6587ce8959b11bf_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-operator-bundle@sha256:25e450ef9a1bbdb5e6d522a98928c0784c483de40f17ee111e8c32e59c4e78c9_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-rhel9-operator@sha256:f331222fc180e7195d51536dab01692da66ad9049671e034867855dce1e5b656_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-tooling-rhel9@sha256:fefa9980c5021706ccac27d05086359f45109790089e586221c08271b55b1b25_amd64"
          ]
        }
      ],
      "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 Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-exec-rhel9@sha256:365e1253b8da2ba88ec97ec5b074d16ac46b31fd7eba3baad6587ce8959b11bf_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-operator-bundle@sha256:25e450ef9a1bbdb5e6d522a98928c0784c483de40f17ee111e8c32e59c4e78c9_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-rhel9-operator@sha256:f331222fc180e7195d51536dab01692da66ad9049671e034867855dce1e5b656_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-tooling-rhel9@sha256:fefa9980c5021706ccac27d05086359f45109790089e586221c08271b55b1b25_amd64"
          ]
        }
      ],
      "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"
    },
    {
      "cve": "CVE-2026-42504",
      "cwe": {
        "id": "CWE-1050",
        "name": "Excessive Platform Resource Consumption within a Loop"
      },
      "discovery_date": "2026-06-02T23:01:00.320527+00:00",
      "flags": [
        {
          "label": "vulnerable_code_not_present",
          "product_ids": [
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-operator-bundle@sha256:25e450ef9a1bbdb5e6d522a98928c0784c483de40f17ee111e8c32e59c4e78c9_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-rhel9-operator@sha256:f331222fc180e7195d51536dab01692da66ad9049671e034867855dce1e5b656_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-tooling-rhel9@sha256:fefa9980c5021706ccac27d05086359f45109790089e586221c08271b55b1b25_amd64"
          ]
        }
      ],
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2484204"
        }
      ],
      "notes": [
        {
          "category": "description",
          "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"
        }
      ],
      "product_status": {
        "fixed": [
          "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-exec-rhel9@sha256:365e1253b8da2ba88ec97ec5b074d16ac46b31fd7eba3baad6587ce8959b11bf_amd64"
        ],
        "known_not_affected": [
          "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-operator-bundle@sha256:25e450ef9a1bbdb5e6d522a98928c0784c483de40f17ee111e8c32e59c4e78c9_amd64",
          "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-rhel9-operator@sha256:f331222fc180e7195d51536dab01692da66ad9049671e034867855dce1e5b656_amd64",
          "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-tooling-rhel9@sha256:fefa9980c5021706ccac27d05086359f45109790089e586221c08271b55b1b25_amd64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-42504"
        },
        {
          "category": "external",
          "summary": "RHBZ#2484204",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2484204"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-42504",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-42504"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42504",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42504"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/774481",
          "url": "https://go.dev/cl/774481"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/79217",
          "url": "https://go.dev/issue/79217"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw",
          "url": "https://groups.google.com/g/golang-announce/c/tKs3rmcBcKw"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-5038",
          "url": "https://pkg.go.dev/vuln/GO-2026-5038"
        }
      ],
      "release_date": "2026-06-02T22:01:37.219000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-20T13:55:42+00:00",
          "details": "To start using the Web Terminal Operator, install the Web Terminal Operator from OpenShift OperatorHub on OpenShift Container Platform 4.21 or higher.",
          "product_ids": [
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-exec-rhel9@sha256:365e1253b8da2ba88ec97ec5b074d16ac46b31fd7eba3baad6587ce8959b11bf_amd64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:42048"
        },
        {
          "category": "workaround",
          "details": "To mitigate this issue, restrict network access to services that process MIME headers from untrusted sources. Implement input validation and sanitization for all incoming data, especially MIME headers, to prevent maliciously crafted content from being processed by applications utilizing the vulnerable Golang MIME package.",
          "product_ids": [
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-exec-rhel9@sha256:365e1253b8da2ba88ec97ec5b074d16ac46b31fd7eba3baad6587ce8959b11bf_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-operator-bundle@sha256:25e450ef9a1bbdb5e6d522a98928c0784c483de40f17ee111e8c32e59c4e78c9_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-rhel9-operator@sha256:f331222fc180e7195d51536dab01692da66ad9049671e034867855dce1e5b656_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-tooling-rhel9@sha256:fefa9980c5021706ccac27d05086359f45109790089e586221c08271b55b1b25_amd64"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "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"
          },
          "products": [
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-exec-rhel9@sha256:365e1253b8da2ba88ec97ec5b074d16ac46b31fd7eba3baad6587ce8959b11bf_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-operator-bundle@sha256:25e450ef9a1bbdb5e6d522a98928c0784c483de40f17ee111e8c32e59c4e78c9_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-rhel9-operator@sha256:f331222fc180e7195d51536dab01692da66ad9049671e034867855dce1e5b656_amd64",
            "Red Hat Web Terminal 1.16:registry.redhat.io/web-terminal/web-terminal-tooling-rhel9@sha256:fefa9980c5021706ccac27d05086359f45109790089e586221c08271b55b1b25_amd64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header"
    }
  ]
}



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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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