RHSA-2026:44868
Vulnerability from csaf_redhat - Published: 2026-07-24 01:48 - Updated: 2026-09-15 08:28Summary
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.
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)
Affected products
Threats
Impact
Moderate
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)
Affected products
Fixed
3 products, the same list as for
CVE-2026-59818
Threats
Impact
Important
References
32 references
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"title": "etcd: etcd: Authentication bypass due to improper Certificate Revocation List enforcement on gRPC listener"
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"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.",
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{
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"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.",
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{
"category": "impact",
"details": "Important"
}
],
"title": "etcd: etcd: Denial of Service via unbounded TLS handshake goroutines"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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