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RHSA-2026:53416

Vulnerability from csaf_redhat - Published: 2026-08-11 12:10 - Updated: 2026-09-03 09:00
Summary
Red Hat Security Advisory: host-metering security update
Severity
Important
Notes
Topic: An update for host-metering is now available for Red Hat Enterprise Linux 7 Extended Lifecycle 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: Host metering service Security Fix(es): * crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries (CVE-2026-27145) 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: 7Server-ELS:host-metering-0:1.4.0-8.el7_9.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-ELS:host-metering-0:1.4.0-8.el7_9.src —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-ELS:host-metering-0:1.4.0-8.el7_9.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-ELS:host-metering-debuginfo-0:1.4.0-8.el7_9.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-ELS:host-metering-debuginfo-0:1.4.0-8.el7_9.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-ELS:host-metering-debugsource-0:1.4.0-8.el7_9.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-ELS:host-metering-debugsource-0:1.4.0-8.el7_9.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: 7Server-ELS:host-metering-selinux-0:1.4.0-8.el7_9.noarch —
Vendor Fix fix
Workaround
Threats
Impact Important
References
To clipboard 

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        "name": "Unchecked Input for Loop Condition"
      },
      "discovery_date": "2026-06-02T23:01:08.992540+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "2484207"
        }
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      "notes": [
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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"
        },
        {
          "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"
        }
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            "7Server-ELS:host-metering-debugsource-0:1.4.0-8.el7_9.ppc64le",
            "7Server-ELS:host-metering-debugsource-0:1.4.0-8.el7_9.x86_64",
            "7Server-ELS:host-metering-selinux-0:1.4.0-8.el7_9.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": [
            "7Server-ELS:host-metering-0:1.4.0-8.el7_9.ppc64le",
            "7Server-ELS:host-metering-0:1.4.0-8.el7_9.src",
            "7Server-ELS:host-metering-0:1.4.0-8.el7_9.x86_64",
            "7Server-ELS:host-metering-debuginfo-0:1.4.0-8.el7_9.ppc64le",
            "7Server-ELS:host-metering-debuginfo-0:1.4.0-8.el7_9.x86_64",
            "7Server-ELS:host-metering-debugsource-0:1.4.0-8.el7_9.ppc64le",
            "7Server-ELS:host-metering-debugsource-0:1.4.0-8.el7_9.x86_64",
            "7Server-ELS:host-metering-selinux-0:1.4.0-8.el7_9.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries"
    }
  ]
}



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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.