RHSA-2026:26210
Vulnerability from csaf_redhat - Published: 2026-06-16 08:46 - Updated: 2026-09-05 21:41Summary
Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.0.12
Severity
Important
Notes
Topic: Red Hat OpenShift Service Mesh 3.0.12
This update has 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: Red Hat OpenShift Service Mesh 3.0.12, which is based on the open source Istio project, addresses a variety of problems in a microservice architecture by creating a centralized point of control in an application.
Security Fix(es):
* openshift-service-mesh/istio-proxyv2-rhel9: envoy: HTTP/2 Remote Denial of Service via HPACK compression bomb and Slowloris-style attack (CVE-2026-47774)
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 denial-of-service vulnerability was found in Envoy's HTTP/2 HPACK header compression implementation. A remote attacker could send a specially crafted HTTP/2 request that triggers disproportionately large memory allocations on the server, leading to resource exhaustion and denial of service.
7.5 (High)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:30de7479aca6bdc71e323cd667d2dec4a120adf1da7b505f8c0972730ef87a86_arm64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:48bbe11575059969889d37f590251e56da1b468b12d2b2f0032162c321108a0a_amd64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:4dcf95fc4a6a18af5dfdac190235c571bee3d750d4b829771781aeab14733389_s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:a7335217f0872592b1ac734aae218085d8a5c230838603ceda1507867ff1c14b_ppc64le | — |
Vendor Fix
fix
Workaround
|
Known not affected
21 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9@sha256:523d7042fb9393b224fd44548f7055b9092882364e645b95b0ed93f151103ee3_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9@sha256:587e343cd859881e47a400d35ae4d99eed8ba61d55adf864d0b4a051d49c90e4_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9@sha256:81ef49c1b622a8932f613cd478698e27bed441173cbab750ca506dbe991a7be5_s390x | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9@sha256:e58217c56fd6e2b931dca68a553533706a8413eabf3c3ed2814a68e70f915d7e_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:2a0d3a49fac70f978cbacbe6221ba5c7c7e1f789c2c20c2e5eaf2f1863f420d2_s390x | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:4a2ad85bfef9cd49a4fe1d7a7147c44172ebf1ef1f5ae4561659452b299f48de_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:c2404012746d39079c6246788a0974fdd8f660c6f9578265c2df855a7b674576_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:e5685dc1a95816e7d93c32409ca52d9a7975c24907b498aacfff6857ba8665f9_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:cf1f51ae282488f63aa76c9963b9595afb47bc576824057379d1bcf92bed70e6_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:d48edb9f2a55f5f0cd2569c88b8314c9f703ef02974f22fde51d406d744e24f2_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:d717699897088fa509a6502f765bff0c817d18097046d7a485cd25bc14dbd42f_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:e20ca32e1f4641c85ae428884211e6fa701f2be0230a8ab0d4eed4cf28cc9bb4_s390x | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:1c7afb9faf38ba8d9154c7d0c5878196fb991a3a2856b54332ea1b46a40121da_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:41926eaff176d83df4c076df99161a55ee395a42e5ccac60c851678e9c0ed256_s390x | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:5d903e0ccad7f33cf5ffdddab8b199d4aac6b144a8958006b1d352b217a4d929_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:92172492762b5b3b15195dc2c627816ffd0068c0741ae5523d510df2d05bc285_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:45cf8be75aa8bf478dcaa55deed88fef42cadc2290f1ea28b1984d04c35bc908_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:60cc56c7a2697214fbd562e36060bbaf08329994f18037b69bd422fba9e2a114_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:6e0e826106365d8a0ee11c7a4e6c79ec83518341f2a175850172211e5a9b0c2d_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:bf55dc918a79d92726432fb45be2b61c9e3f3bf6cd139f534b051d85ebbb272d_s390x | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-sail-operator-bundle@sha256:afba220ae878102ac25604ec734206c4859eda22973804f89c51d85e6a92184e_amd64 | — |
Workaround
|
Threats
Impact
Important
References
9 references
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{
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{
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"text": "A denial-of-service vulnerability was found in Envoy\u0027s HTTP/2 HPACK header compression implementation. A remote attacker could send a specially crafted HTTP/2 request that triggers disproportionately large memory allocations on the server, leading to resource exhaustion and denial of service.",
"title": "Vulnerability description"
},
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"text": "envoy: envoy: HTTP/2 Remote Denial of Service via HPACK compression bomb and Slowloris-style attack",
"title": "Vulnerability summary"
},
{
"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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"Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:a7335217f0872592b1ac734aae218085d8a5c230838603ceda1507867ff1c14b_ppc64le"
],
"known_not_affected": [
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"Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9@sha256:587e343cd859881e47a400d35ae4d99eed8ba61d55adf864d0b4a051d49c90e4_amd64",
"Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9@sha256:81ef49c1b622a8932f613cd478698e27bed441173cbab750ca506dbe991a7be5_s390x",
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"Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:4a2ad85bfef9cd49a4fe1d7a7147c44172ebf1ef1f5ae4561659452b299f48de_amd64",
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"Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-sail-operator-bundle@sha256:afba220ae878102ac25604ec734206c4859eda22973804f89c51d85e6a92184e_amd64"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-47774"
},
{
"category": "external",
"summary": "RHBZ#2487465",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2487465"
},
{
"category": "external",
"summary": "RHSB-2026-007",
"url": "https://access.redhat.com/security/vulnerabilities/RHSB-2026-007"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-47774",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-47774"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-47774",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-47774"
}
],
"release_date": "2026-06-04T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-16T08:46:30+00:00",
"details": "See Red Hat OpenShift Service Mesh 3.0.12 documentation at https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.0",
"product_ids": [
"Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:30de7479aca6bdc71e323cd667d2dec4a120adf1da7b505f8c0972730ef87a86_arm64",
"Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:48bbe11575059969889d37f590251e56da1b468b12d2b2f0032162c321108a0a_amd64",
"Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:4dcf95fc4a6a18af5dfdac190235c571bee3d750d4b829771781aeab14733389_s390x",
"Red Hat OpenShift Service Mesh 3.0:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:a7335217f0872592b1ac734aae218085d8a5c230838603ceda1507867ff1c14b_ppc64le"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:26210"
},
{
"category": "workaround",
"details": "See the security bulletin for a detailed mitigation procedure.",
"product_ids": [
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]
}
],
"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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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "envoy: envoy: HTTP/2 Remote Denial of Service via HPACK compression bomb and Slowloris-style attack"
}
]
}
Loading…
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.
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