RHSA-2026:41930

Vulnerability from csaf_redhat - Published: 2026-07-20 11:31 - Updated: 2026-07-22 17:07
Summary
Red Hat Security Advisory: rhc security update
Severity
Important
Notes
Topic: An update for rhc is now available for Red Hat Enterprise Linux 8. 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: rhc is a client tool and daemon that connects the system to Red Hat hosted services enabling system and subscription management. Security Fix(es): * golang.org/x/net/idna: golang: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821) * 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: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-9.el8_10.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-9.el8_10.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-9.el8_10.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-9.el8_10.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-9.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-9.el8_10.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-9.el8_10.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-9.el8_10.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-9.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-9.el8_10.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-9.el8_10.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-9.el8_10.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-9.el8_10.x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important
CVE-2026-39821

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.

8.2 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
CWE-1289 - Improper Validation of Unsafe Equivalence in Input
Affected products
Product Identifier Version Remediation
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-9.el8_10.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-9.el8_10.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-9.el8_10.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-9.el8_10.src —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-9.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-9.el8_10.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-9.el8_10.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-9.el8_10.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-9.el8_10.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-9.el8_10.aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-9.el8_10.ppc64le —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-9.el8_10.s390x —
Vendor Fix fix
Workaround
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-9.el8_10.x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Important
References
To clipboard 

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          "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.",
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            "AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-9.el8_10.ppc64le",
            "AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-9.el8_10.s390x",
            "AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-9.el8_10.x86_64",
            "AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-9.el8_10.aarch64",
            "AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-9.el8_10.ppc64le",
            "AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-9.el8_10.s390x",
            "AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-9.el8_10.x86_64"
          ]
        }
      ],
      "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": [
            "AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-9.el8_10.aarch64",
            "AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-9.el8_10.ppc64le",
            "AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-9.el8_10.s390x",
            "AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-9.el8_10.src",
            "AppStream-8.10.0.Z.MAIN.EUS:rhc-1:0.2.5-9.el8_10.x86_64",
            "AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-9.el8_10.aarch64",
            "AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-9.el8_10.ppc64le",
            "AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-9.el8_10.s390x",
            "AppStream-8.10.0.Z.MAIN.EUS:rhc-debuginfo-1:0.2.5-9.el8_10.x86_64",
            "AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-9.el8_10.aarch64",
            "AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-9.el8_10.ppc64le",
            "AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-9.el8_10.s390x",
            "AppStream-8.10.0.Z.MAIN.EUS:rhc-debugsource-1:0.2.5-9.el8_10.x86_64"
          ]
        }
      ],
      "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"
    }
  ]
}



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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.