RHSA-2026:49703

Vulnerability from csaf_redhat - Published: 2026-08-03 16:15 - Updated: 2026-08-04 22:23
Summary
Red Hat Security Advisory: delve security, bug fix, and enhancement update
Severity
Important
Notes
Topic: An update for delve is now available for Red Hat Enterprise Linux 10.0 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Delve is a debugger for the Go programming language. The goal of the project is to provide a simple, full featured debugging tool for Go. Delve should be easy to invoke and easy to use. Chances are if you're using a debugger, things aren't going your way. With that in mind, Delve should stay out of your way as much as possible. 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 Delve to 1.26 [rhel-10.0.z] (JIRA:RHEL-213072) 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.
CVE-2026-27145

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.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-606 - Unchecked Input for Loop Condition
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:delve-debuginfo-0:1.26.1-1.el10_0.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:delve-debuginfo-0:1.26.1-1.el10_0.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:delve-debuginfo-0:1.26.1-1.el10_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:delve-debugsource-0:1.26.1-1.el10_0.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:delve-debugsource-0:1.26.1-1.el10_0.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:delve-debugsource-0:1.26.1-1.el10_0.x86_64 —
Vendor Fix fix
Workaround
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
Product Identifier Version Remediation
Unresolved product id: AppStream-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:delve-debuginfo-0:1.26.1-1.el10_0.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:delve-debuginfo-0:1.26.1-1.el10_0.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:delve-debuginfo-0:1.26.1-1.el10_0.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:delve-debugsource-0:1.26.1-1.el10_0.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:delve-debugsource-0:1.26.1-1.el10_0.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-10.0.Z.E2S:delve-debugsource-0:1.26.1-1.el10_0.x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important
References
To clipboard 

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        "name": "Unchecked Input for Loop Condition"
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        {
          "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"
        },
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          "text": "crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries",
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          "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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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "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"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-27145",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-27145"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-27145",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27145"
        },
        {
          "category": "external",
          "summary": "https://go.dev/cl/783621",
          "url": "https://go.dev/cl/783621"
        },
        {
          "category": "external",
          "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"
        },
        {
          "category": "external",
          "summary": "https://pkg.go.dev/vuln/GO-2026-5037",
          "url": "https://pkg.go.dev/vuln/GO-2026-5037"
        }
      ],
      "release_date": "2026-06-02T22:01:36.954000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-08-03T16:15:57+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": [
            "AppStream-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.aarch64",
            "AppStream-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.ppc64le",
            "AppStream-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.src",
            "AppStream-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.x86_64",
            "AppStream-10.0.Z.E2S:delve-debuginfo-0:1.26.1-1.el10_0.aarch64",
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            "AppStream-10.0.Z.E2S:delve-debuginfo-0:1.26.1-1.el10_0.x86_64",
            "AppStream-10.0.Z.E2S:delve-debugsource-0:1.26.1-1.el10_0.aarch64",
            "AppStream-10.0.Z.E2S:delve-debugsource-0:1.26.1-1.el10_0.ppc64le",
            "AppStream-10.0.Z.E2S:delve-debugsource-0:1.26.1-1.el10_0.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:49703"
        },
        {
          "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).",
          "product_ids": [
            "AppStream-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.aarch64",
            "AppStream-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.ppc64le",
            "AppStream-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.src",
            "AppStream-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.x86_64",
            "AppStream-10.0.Z.E2S:delve-debuginfo-0:1.26.1-1.el10_0.aarch64",
            "AppStream-10.0.Z.E2S:delve-debuginfo-0:1.26.1-1.el10_0.ppc64le",
            "AppStream-10.0.Z.E2S:delve-debuginfo-0:1.26.1-1.el10_0.x86_64",
            "AppStream-10.0.Z.E2S:delve-debugsource-0:1.26.1-1.el10_0.aarch64",
            "AppStream-10.0.Z.E2S:delve-debugsource-0:1.26.1-1.el10_0.ppc64le",
            "AppStream-10.0.Z.E2S:delve-debugsource-0:1.26.1-1.el10_0.x86_64"
          ]
        }
      ],
      "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-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.aarch64",
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            "AppStream-10.0.Z.E2S:delve-debuginfo-0:1.26.1-1.el10_0.x86_64",
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "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": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2467822"
        }
      ],
      "notes": [
        {
          "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"
        }
      ],
      "product_status": {
        "fixed": [
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-33811"
        },
        {
          "category": "external",
          "summary": "RHBZ#2467822",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2467822"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-33811",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-33811"
        },
        {
          "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": "2026-08-03T16:15:57+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-10.0.Z.E2S:delve-debugsource-0:1.26.1-1.el10_0.x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:49703"
        },
        {
          "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": [
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            "AppStream-10.0.Z.E2S:delve-debugsource-0:1.26.1-1.el10_0.x86_64"
          ]
        }
      ],
      "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": [
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            "AppStream-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.ppc64le",
            "AppStream-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.src",
            "AppStream-10.0.Z.E2S:delve-0:1.26.1-1.el10_0.x86_64",
            "AppStream-10.0.Z.E2S:delve-debuginfo-0:1.26.1-1.el10_0.aarch64",
            "AppStream-10.0.Z.E2S:delve-debuginfo-0:1.26.1-1.el10_0.ppc64le",
            "AppStream-10.0.Z.E2S:delve-debuginfo-0:1.26.1-1.el10_0.x86_64",
            "AppStream-10.0.Z.E2S:delve-debugsource-0:1.26.1-1.el10_0.aarch64",
            "AppStream-10.0.Z.E2S:delve-debugsource-0:1.26.1-1.el10_0.ppc64le",
            "AppStream-10.0.Z.E2S:delve-debugsource-0:1.26.1-1.el10_0.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME"
    }
  ]
}



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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.