RHSA-2026:44868

Vulnerability from csaf_redhat - Published: 2026-07-24 01:48 - Updated: 2026-09-25 15:26
Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs: etcd: * etcd-3.7.1-0.1.hum1 (aarch64, x86_64) * etcd-3.7.1-0.1.hum1.src (src)
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-2026-44283

A flaw was found in etcd, a distributed key-value store. An authenticated user, without sufficient read or lease-related permissions, could bypass Role-Based Access Control (RBAC) authorization checks. This bypass occurs during transaction operations involving PrevKv or lease attachment in Put requests, potentially leading to unauthorized data access or lease attachment.

4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CWE-639 - Authorization Bypass Through User-Controlled Key
Affected products
Product Identifier Version Remediation
Unresolved product id: Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@aarch64 —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@src —
Vendor Fix fix
Workaround
Unresolved product id: Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@x86_64 —
Vendor Fix fix
Workaround
Threats
Impact Moderate
CVE-2026-59818

A flaw was found in etcd, a distributed key-value store. When etcd is configured to use separate listeners for HTTP and gRPC client endpoints, the Certificate Revocation List (CRL) is not properly enforced on the gRPC listener. This oversight allows a client with a revoked certificate to successfully authenticate, potentially leading to unauthorized access and compromise of data integrity.

6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
CWE-295 - Improper Certificate Validation
Affected products
Fixed 3 products, the same list as for CVE-2026-44283
Threats
Impact Moderate
CVE-2026-73500

A flaw was found in etcd, a distributed key-value store. A remote attacker can exploit this by opening numerous TCP connections to an etcd TLS listener without completing the TLS handshake. This action causes the `tlsListener.acceptLoop` to spawn an unbounded number of goroutines, which consume excessive memory. This resource exhaustion leads to a Denial of Service (DoS) for the etcd cluster and, consequently, for the Kubernetes control plane it supports.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Fixed 3 products, the same list as for CVE-2026-44283
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:44868 self
https://images.redhat.com/ external
https://access.redhat.com/security/cve/CVE-2026-73500 external
https://access.redhat.com/security/updates/classi… external
https://access.redhat.com/security/cve/CVE-2026-59818 external
https://access.redhat.com/security/cve/CVE-2026-44283 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2026-44283 self
https://bugzilla.redhat.com/show_bug.cgi?id=2477527 external
https://www.cve.org/CVERecord?id=CVE-2026-44283 external
https://nvd.nist.gov/vuln/detail/CVE-2026-44283 external
https://github.com/etcd-io/etcd/security/advisori… external
https://access.redhat.com/security/cve/CVE-2026-59818 self
https://bugzilla.redhat.com/show_bug.cgi?id=2498305 external
https://www.cve.org/CVERecord?id=CVE-2026-59818 external
https://nvd.nist.gov/vuln/detail/CVE-2026-59818 external
https://github.com/etcd-io/etcd/commit/2308ce1578… external
https://github.com/etcd-io/etcd/commit/24838af5a5… external
https://github.com/etcd-io/etcd/commit/8221ae82bc… external
https://github.com/etcd-io/etcd/pull/22007 external
https://github.com/etcd-io/etcd/pull/22021 external
https://github.com/etcd-io/etcd/pull/22025 external
https://github.com/etcd-io/etcd/releases/tag/v3.5.32 external
https://github.com/etcd-io/etcd/releases/tag/v3.6.13 external
https://github.com/etcd-io/etcd/security/advisori… external
https://access.redhat.com/security/cve/CVE-2026-73500 self
https://bugzilla.redhat.com/show_bug.cgi?id=2515007 external
https://www.cve.org/CVERecord?id=CVE-2026-73500 external
https://nvd.nist.gov/vuln/detail/CVE-2026-73500 external
https://github.com/etcd-io/etcd/commit/2e07efce97… external
https://github.com/etcd-io/etcd/commit/89ff6d5079… external
https://github.com/etcd-io/etcd/commit/8e4dd0679a… external
https://github.com/etcd-io/etcd/commit/f73cba7d92… external
https://github.com/etcd-io/etcd/pull/22130 external
https://github.com/etcd-io/etcd/releases/tag/v3.5.33 external
https://github.com/etcd-io/etcd/releases/tag/v3.6.14 external
https://github.com/etcd-io/etcd/releases/tag/v3.7.1 external
https://github.com/etcd-io/etcd/security/advisori… external
To clipboard 

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          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
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        {
          "category": "external",
          "summary": "https://github.com/etcd-io/etcd/security/advisories/GHSA-3wh4-j44w-pg92",
          "url": "https://github.com/etcd-io/etcd/security/advisories/GHSA-3wh4-j44w-pg92"
        }
      ],
      "release_date": "2026-07-08T21:00:18.207000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-24T01:48:52+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@aarch64",
            "Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@src",
            "Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:44868"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@aarch64",
            "Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@src",
            "Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "etcd: etcd: Authentication bypass due to improper Certificate Revocation List enforcement on gRPC listener"
    },
    {
      "cve": "CVE-2026-73500",
      "cwe": {
        "id": "CWE-770",
        "name": "Allocation of Resources Without Limits or Throttling"
      },
      "discovery_date": "2026-08-12T21:41:05.096460+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2515007"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in etcd, a distributed key-value store. A remote attacker can exploit this by opening numerous TCP connections to an etcd TLS listener without completing the TLS handshake. This action causes the `tlsListener.acceptLoop` to spawn an unbounded number of goroutines, which consume excessive memory. This resource exhaustion leads to a Denial of Service (DoS) for the etcd cluster and, consequently, for the Kubernetes control plane it supports.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "etcd: etcd: Denial of Service via unbounded TLS handshake goroutines",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is an Important denial of service flaw in etcd, a critical component for distributed systems and Kubernetes control planes. A remote attacker can exhaust etcd memory by initiating numerous incomplete TLS handshakes, leading to a loss of availability for affected clusters.",
          "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 Hardened Images:etcd-0:3.7.1-0.1.hum1@aarch64",
          "Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@src",
          "Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-73500"
        },
        {
          "category": "external",
          "summary": "RHBZ#2515007",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515007"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-73500",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-73500"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-73500",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-73500"
        },
        {
          "category": "external",
          "summary": "https://github.com/etcd-io/etcd/commit/2e07efce9745004eb4773cffaada9b5cdf77cff2",
          "url": "https://github.com/etcd-io/etcd/commit/2e07efce9745004eb4773cffaada9b5cdf77cff2"
        },
        {
          "category": "external",
          "summary": "https://github.com/etcd-io/etcd/commit/89ff6d50796049d4f1136915ba21504b76e7e372",
          "url": "https://github.com/etcd-io/etcd/commit/89ff6d50796049d4f1136915ba21504b76e7e372"
        },
        {
          "category": "external",
          "summary": "https://github.com/etcd-io/etcd/commit/8e4dd0679a2c6b095d2a32a749fda2521c7809a3",
          "url": "https://github.com/etcd-io/etcd/commit/8e4dd0679a2c6b095d2a32a749fda2521c7809a3"
        },
        {
          "category": "external",
          "summary": "https://github.com/etcd-io/etcd/commit/f73cba7d920019f91a1ea1f6697833e42731f057",
          "url": "https://github.com/etcd-io/etcd/commit/f73cba7d920019f91a1ea1f6697833e42731f057"
        },
        {
          "category": "external",
          "summary": "https://github.com/etcd-io/etcd/pull/22130",
          "url": "https://github.com/etcd-io/etcd/pull/22130"
        },
        {
          "category": "external",
          "summary": "https://github.com/etcd-io/etcd/releases/tag/v3.5.33",
          "url": "https://github.com/etcd-io/etcd/releases/tag/v3.5.33"
        },
        {
          "category": "external",
          "summary": "https://github.com/etcd-io/etcd/releases/tag/v3.6.14",
          "url": "https://github.com/etcd-io/etcd/releases/tag/v3.6.14"
        },
        {
          "category": "external",
          "summary": "https://github.com/etcd-io/etcd/releases/tag/v3.7.1",
          "url": "https://github.com/etcd-io/etcd/releases/tag/v3.7.1"
        },
        {
          "category": "external",
          "summary": "https://github.com/etcd-io/etcd/security/advisories/GHSA-6vch-q96h-7gc3",
          "url": "https://github.com/etcd-io/etcd/security/advisories/GHSA-6vch-q96h-7gc3"
        }
      ],
      "release_date": "2026-08-12T21:22:25.151000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-24T01:48:52+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
          "product_ids": [
            "Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@aarch64",
            "Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@src",
            "Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@x86_64"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:44868"
        },
        {
          "category": "workaround",
          "details": "Restrict network access to the etcd TLS listener to only trusted clients and networks. Configure firewall rules to limit inbound connections to the etcd client port (default 2379) and peer port (default 2380) to authorized hosts. This reduces the attack surface by preventing untrusted network attackers from reaching the vulnerable service.",
          "product_ids": [
            "Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@aarch64",
            "Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@src",
            "Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@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": [
            "Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@aarch64",
            "Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@src",
            "Red Hat Hardened Images:etcd-0:3.7.1-0.1.hum1@x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "etcd: etcd: Denial of Service via unbounded TLS handshake goroutines"
    }
  ]
}



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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.



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.