RHSA-2026:97387

Vulnerability from csaf_redhat - Published: 2026-11-10 18:53 - Updated: 2026-11-14 02:33
Summary
Red Hat Security Advisory: go-fdo-server security update
Severity
Important
Notes
Topic: An update for go-fdo-server 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: This package provides a server-side implementation of the FIDO Device Onboard (FDO) specification, written in Go. FDO is an open standard for the late binding of device credentials, allowing for automated and secure on-boarding of devices when they are first powered on in their final location. Security Fix(es): * crypto/x509: Incorrect enforcement of email constraints in crypto/x509 (CVE-2026-27137) * net/url: Incorrect parsing of IPv6 host literals in net/url (CVE-2026-25679) * net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME (CVE-2026-33811) * encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue (CVE-2026-56859) 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. Additional Changes: For detailed information on changes in this release, see the Red Hat Enterprise Linux 10 Release Notes linked from 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.
CVE-2026-25679

The Go standard library function net/url.Parse insufficiently validated the host/authority component and accepted some invalid URLs by effectively treating garbage before an IP-literal as ignorable. The function should have rejected this as invalid.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-1286 - Improper Validation of Syntactic Correctness of Input
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-10.3.GA:go-fdo-server-0:1.0.1-6.el10_3.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.3.GA:go-fdo-server-0:1.0.1-6.el10_3.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.3.GA:go-fdo-server-0:1.0.1-6.el10_3.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.3.GA:go-fdo-server-debuginfo-0:1.0.1-6.el10_3.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.3.GA:go-fdo-server-debuginfo-0:1.0.1-6.el10_3.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.3.GA:go-fdo-server-debugsource-0:1.0.1-6.el10_3.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.3.GA:go-fdo-server-debugsource-0:1.0.1-6.el10_3.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.3.GA:go-fdo-server-manufacturer-0:1.0.1-6.el10_3.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.3.GA:go-fdo-server-owner-0:1.0.1-6.el10_3.noarch —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.3.GA:go-fdo-server-rendezvous-0:1.0.1-6.el10_3.noarch —
Vendor Fix fix
Workaround
Threats
Impact Important
CVE-2026-27137

A certificate validation flaw has been discovered in the golang crypto/x509 module. When verifying a certificate chain which contains a certificate containing multiple email address constraints which share common local portions but different domain portions, these constraints will not be properly applied, and only the last constraint will be considered.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-295 - Improper Certificate Validation
Affected products
Fixed 10 products, the same list as for CVE-2026-25679
Threats
Impact Important
CVE-2026-33811

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.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-1341 - Multiple Releases of Same Resource or Handle
Affected products
Fixed 10 products, the same list as for CVE-2026-25679
Threats
Impact Important
CVE-2026-56859

A flaw was found in the `encoding/xml` package of Go. The `DecodeElement` function failed to correctly track recursion depth, which could lead to stack exhaustion. A remote attacker could exploit this vulnerability by providing a specially crafted XML input, resulting in a Denial of Service (DoS) for the affected application.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-776 - Improper Restriction of Recursive Entity References in DTDs
Affected products
Fixed 10 products, the same list as for CVE-2026-25679
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:97387 self
https://docs.redhat.com/en/documentation/red_hat_… external
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2445345 external
https://bugzilla.redhat.com/show_bug.cgi?id=2445356 external
https://bugzilla.redhat.com/show_bug.cgi?id=2467822 external
https://bugzilla.redhat.com/show_bug.cgi?id=2515840 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2026-25679 self
https://bugzilla.redhat.com/show_bug.cgi?id=2445356 external
https://www.cve.org/CVERecord?id=CVE-2026-25679 external
https://nvd.nist.gov/vuln/detail/CVE-2026-25679 external
https://go.dev/cl/752180 external
https://go.dev/issue/77578 external
https://groups.google.com/g/golang-announce/c/Edh… external
https://pkg.go.dev/vuln/GO-2026-4601 external
https://access.redhat.com/security/cve/CVE-2026-27137 self
https://bugzilla.redhat.com/show_bug.cgi?id=2445345 external
https://www.cve.org/CVERecord?id=CVE-2026-27137 external
https://nvd.nist.gov/vuln/detail/CVE-2026-27137 external
https://go.dev/cl/752182 external
https://go.dev/issue/77952 external
https://pkg.go.dev/vuln/GO-2026-4599 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-2026-56859 self
https://bugzilla.redhat.com/show_bug.cgi?id=2515840 external
https://www.cve.org/CVERecord?id=CVE-2026-56859 external
https://nvd.nist.gov/vuln/detail/CVE-2026-56859 external
https://go.dev/cl/803320 external
https://go.dev/issue/80481 external
https://groups.google.com/g/golang-announce/c/94p… external
https://pkg.go.dev/vuln/GO-2026-6088 external
To clipboard 

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        "name": "Improper Validation of Syntactic Correctness of Input"
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      "discovery_date": "2026-03-06T22:02:11.567841+00:00",
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          "text": "2445356"
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        {
          "category": "description",
          "text": "The Go standard library function net/url.Parse insufficiently validated the host/authority component and accepted some invalid URLs by effectively treating garbage before an IP-literal as ignorable. The function should have rejected this as invalid.",
          "title": "Vulnerability description"
        },
        {
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          "text": "net/url: Incorrect parsing of IPv6 host literals in net/url",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat evaluates this vulnerability as having an Important severity because unauthenticated remote attackers can target exposed Go services over the network to trigger severe denial-of-service conditions or validation discrepancies without requiring elevated privileges. Across standard Red Hat environments\u2014including OpenShift Container Platform and Red Hat Enterprise Linux container tools\u2014many components rely on the core Go runtime to process user-supplied addresses and endpoints. Although improper handling of malformed host segments in web addresses can disrupt network-facing daemons, the vulnerability cannot be leveraged for arbitrary code execution or data leakage, keeping the risk bounded within the Important classification.",
          "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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          "category": "vendor_fix",
          "date": "2026-11-10T18:53:20+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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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
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            "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",
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          "details": "Important"
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      "title": "net/url: Incorrect parsing of IPv6 host literals in net/url"
    },
    {
      "cve": "CVE-2026-27137",
      "cwe": {
        "id": "CWE-295",
        "name": "Improper Certificate Validation"
      },
      "discovery_date": "2026-03-06T22:01:38.859733+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2445345"
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        {
          "category": "description",
          "text": "A certificate validation flaw has been discovered in the golang crypto/x509 module. When verifying a certificate chain which contains a certificate containing multiple email address constraints which share common local portions but different domain portions, these constraints will not be properly applied, and only the last constraint will be considered.",
          "title": "Vulnerability description"
        },
        {
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          "text": "crypto/x509: Incorrect enforcement of email constraints in crypto/x509",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This vulnerability is rated as an Important impact because unauthenticated network entities can bypass identity restrictions without requiring local system privileges. In Red Hat environments hosting Go-based network services or container infrastructure, certificate chain validation overlooks specific email name constraints when multiple rules share an identical local mailbox name across distinct domain names. As a result, a subordinate certificate authority could successfully issue unauthorized certificates that circumvent organizational security policies, leading to improper trust establishment.",
          "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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    {
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        "id": "CWE-1341",
        "name": "Multiple Releases of Same Resource or Handle"
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      "ids": [
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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"
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        {
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          "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"
        },
        {
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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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        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33811",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33811"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/767860",
          "url": "https://go.dev/cl/767860"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/78803",
          "url": "https://go.dev/issue/78803"
        },
        {
          "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-2026-4981",
          "url": "https://pkg.go.dev/vuln/GO-2026-4981"
        }
      ],
      "release_date": "2026-05-07T19:41:19.285000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T18:53:20+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",
          "product_ids": [
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            "AppStream-10.3.GA:go-fdo-server-0:1.0.1-6.el10_3.src",
            "AppStream-10.3.GA:go-fdo-server-0:1.0.1-6.el10_3.x86_64",
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            "AppStream-10.3.GA:go-fdo-server-debuginfo-0:1.0.1-6.el10_3.x86_64",
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            "AppStream-10.3.GA:go-fdo-server-debugsource-0:1.0.1-6.el10_3.x86_64",
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            "AppStream-10.3.GA:go-fdo-server-owner-0:1.0.1-6.el10_3.noarch",
            "AppStream-10.3.GA:go-fdo-server-rendezvous-0:1.0.1-6.el10_3.noarch"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:97387"
        },
        {
          "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": [
            "AppStream-10.3.GA:go-fdo-server-0:1.0.1-6.el10_3.aarch64",
            "AppStream-10.3.GA:go-fdo-server-0:1.0.1-6.el10_3.src",
            "AppStream-10.3.GA:go-fdo-server-0:1.0.1-6.el10_3.x86_64",
            "AppStream-10.3.GA:go-fdo-server-debuginfo-0:1.0.1-6.el10_3.aarch64",
            "AppStream-10.3.GA:go-fdo-server-debuginfo-0:1.0.1-6.el10_3.x86_64",
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            "AppStream-10.3.GA:go-fdo-server-owner-0:1.0.1-6.el10_3.noarch",
            "AppStream-10.3.GA:go-fdo-server-rendezvous-0:1.0.1-6.el10_3.noarch"
          ]
        }
      ],
      "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": [
            "AppStream-10.3.GA:go-fdo-server-0:1.0.1-6.el10_3.aarch64",
            "AppStream-10.3.GA:go-fdo-server-0:1.0.1-6.el10_3.src",
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            "AppStream-10.3.GA:go-fdo-server-debuginfo-0:1.0.1-6.el10_3.aarch64",
            "AppStream-10.3.GA:go-fdo-server-debuginfo-0:1.0.1-6.el10_3.x86_64",
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            "AppStream-10.3.GA:go-fdo-server-debugsource-0:1.0.1-6.el10_3.x86_64",
            "AppStream-10.3.GA:go-fdo-server-manufacturer-0:1.0.1-6.el10_3.noarch",
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            "AppStream-10.3.GA:go-fdo-server-rendezvous-0:1.0.1-6.el10_3.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME"
    },
    {
      "cve": "CVE-2026-56859",
      "cwe": {
        "id": "CWE-776",
        "name": "Improper Restriction of Recursive Entity References in DTDs"
      },
      "discovery_date": "2026-08-13T22:16:52.493058+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2515840"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the `encoding/xml` package of Go. The `DecodeElement` function failed to correctly track recursion depth, which could lead to stack exhaustion. A remote attacker could exploit this vulnerability by providing a specially crafted XML input, resulting in a Denial of Service (DoS) for the affected application.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "An Important denial of service flaw affects applications utilizing the Go `encoding/xml` package. This vulnerability arises from an issue in XML decoding where a recursion depth counter fails to reset, potentially leading to stack exhaustion when processing malicious XML input.",
          "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": [
          "AppStream-10.3.GA:go-fdo-server-0:1.0.1-6.el10_3.aarch64",
          "AppStream-10.3.GA:go-fdo-server-0:1.0.1-6.el10_3.src",
          "AppStream-10.3.GA:go-fdo-server-0:1.0.1-6.el10_3.x86_64",
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          "AppStream-10.3.GA:go-fdo-server-debuginfo-0:1.0.1-6.el10_3.x86_64",
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          "AppStream-10.3.GA:go-fdo-server-debugsource-0:1.0.1-6.el10_3.x86_64",
          "AppStream-10.3.GA:go-fdo-server-manufacturer-0:1.0.1-6.el10_3.noarch",
          "AppStream-10.3.GA:go-fdo-server-owner-0:1.0.1-6.el10_3.noarch",
          "AppStream-10.3.GA:go-fdo-server-rendezvous-0:1.0.1-6.el10_3.noarch"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-56859"
        },
        {
          "category": "external",
          "summary": "RHBZ#2515840",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515840"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-56859",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-56859"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-56859",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56859"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/803320",
          "url": "https://go.dev/cl/803320"
        },
        {
          "category": "external",
          "summary": "https://go.dev/issue/80481",
          "url": "https://go.dev/issue/80481"
        },
        {
          "category": "external",
          "summary": "https://groups.google.com/g/golang-announce/c/94pEornpRlI",
          "url": "https://groups.google.com/g/golang-announce/c/94pEornpRlI"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-6088",
          "url": "https://pkg.go.dev/vuln/GO-2026-6088"
        }
      ],
      "release_date": "2026-08-13T21:58:52.959000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-10T18:53:20+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-2026:97387"
        },
        {
          "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": [
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      ],
      "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"
          },
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue"
    }
  ]
}



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Tags
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.