RHSA-2026:26247
Vulnerability from csaf_redhat - Published: 2026-06-16 10:02 - Updated: 2026-09-05 21:41Summary
Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.3.4
Severity
Important
Notes
Topic: Red Hat OpenShift Service Mesh 3.3.4
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 3.3.4, 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 3.3:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:215cb6b3601b4717644a989d834603079201ca5b7d5f235123d515ac35c51088_s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:c39845ef1238ded68ad33f97189bc6e4414c80967c8edb1a6b779920a9818d7e_amd64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:db328d4648c30a8080dba6cc40a9d077d172ee8383137ba897b71a987167e8a7_ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:df8f04d5ef0803440579658d273900bb9f643e91e89a3986de19c362aa7d3539_arm64 | — |
Vendor Fix
fix
Workaround
|
Known not affected
21 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:59fe5085f0c9e3aeeee3f34c1f76df7eb636ea090d8d3128c425a4c32b71fd69_s390x | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:66ad6ad07870afc1357b1480c0c591a86e206ca76cbddd9dd5efb8812569537b_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:7c93788b8c6eb3d36d80a8e0fb66b7db370ccd50fb78cf2d2378d14a05f87a9a_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:d25c8161022288f9f9ba42c75f250e20122892891499c3d3e165d939d421e746_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:8450eb411dd1f37f5b4a7edeb2afb17c5f7794ee75e1c2c09113d46415fc7318_s390x | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:c25237a503e63fc6fe16f03c783df49e03d7ffe87753cdbcfb3a07b17bff6aa7_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:d678c75a3bdb0eb72505e82c5ee3cdc17a43c466aa9a2b48d5749ea25a509656_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:d71f9ff7b96d37596b2d2120e53caef09d336bf8e0fa629a4ca19e895855db21_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:2aafc7b43e740a0b829afd1017c3843e24d2818f9361620557588cd2141cb718_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:616565cc2d12ee3f399d19117878d4d4dcf65d60d6ce3befaea68b20663db7e5_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:96d1dac863cc10892fcc1381695077193dd0d00d6c719a1024422059f69e65bb_s390x | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:d94b79e1ddb87b4e2181408afc11cb84bd6a9c749028faa3653412f19de5a511_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:39c2eea423cd822eac5537b21fd74b24732d891c726dabade2eee516dff1abf9_s390x | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:93edf7112509fec39c838a52724ec19fc7ec948a0f4aeaacd6092fd7648e0b7d_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:efa1d5925639c397d82967b0fc36f8a9695abc940b88061734b91fb25afb0b74_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:f13c5423bb47b3e1e2ed5e137c47b3616898f1bdb4ff5316b029500e3334c448_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-sail-operator-bundle@sha256:e3712a16441ba402c3df852b757d2d04b83772cd3bb1858688c5df2faf9b9a77_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:0ee97c0bace1ef2b81886d2607dbd6cee91494544c30d88e1fb030f7018b1713_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:74b54c37135730492f98ddd75c9e9998e281ac71730692f77a676879b5135ac2_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:a0af444b19f15990a251a1de7de89e45400ee62612d2a12c98d917f99349e560_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:c91642247486c86586ec5328e0e0ddffe0fa891d31eff59ff7af80d412a2a02b_s390x | — |
Workaround
|
Threats
Impact
Important
References
9 references
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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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"category": "summary",
"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 3.3:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:db328d4648c30a8080dba6cc40a9d077d172ee8383137ba897b71a987167e8a7_ppc64le",
"Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:df8f04d5ef0803440579658d273900bb9f643e91e89a3986de19c362aa7d3539_arm64"
],
"known_not_affected": [
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"Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:66ad6ad07870afc1357b1480c0c591a86e206ca76cbddd9dd5efb8812569537b_ppc64le",
"Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:7c93788b8c6eb3d36d80a8e0fb66b7db370ccd50fb78cf2d2378d14a05f87a9a_amd64",
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"Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:8450eb411dd1f37f5b4a7edeb2afb17c5f7794ee75e1c2c09113d46415fc7318_s390x",
"Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:c25237a503e63fc6fe16f03c783df49e03d7ffe87753cdbcfb3a07b17bff6aa7_amd64",
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"Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:96d1dac863cc10892fcc1381695077193dd0d00d6c719a1024422059f69e65bb_s390x",
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"Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:93edf7112509fec39c838a52724ec19fc7ec948a0f4aeaacd6092fd7648e0b7d_ppc64le",
"Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:efa1d5925639c397d82967b0fc36f8a9695abc940b88061734b91fb25afb0b74_amd64",
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"Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:0ee97c0bace1ef2b81886d2607dbd6cee91494544c30d88e1fb030f7018b1713_amd64",
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]
},
"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": "2026-06-16T10:02:04+00:00",
"details": "See Red Hat OpenShift Service Mesh 3.3.4 documentation at https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.3",
"product_ids": [
"Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:215cb6b3601b4717644a989d834603079201ca5b7d5f235123d515ac35c51088_s390x",
"Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:c39845ef1238ded68ad33f97189bc6e4414c80967c8edb1a6b779920a9818d7e_amd64",
"Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:db328d4648c30a8080dba6cc40a9d077d172ee8383137ba897b71a987167e8a7_ppc64le",
"Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:df8f04d5ef0803440579658d273900bb9f643e91e89a3986de19c362aa7d3539_arm64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:26247"
},
{
"category": "workaround",
"details": "See the security bulletin for a detailed mitigation procedure.",
"product_ids": [
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"Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:66ad6ad07870afc1357b1480c0c591a86e206ca76cbddd9dd5efb8812569537b_ppc64le",
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"Red Hat OpenShift Service Mesh 3.3:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:8450eb411dd1f37f5b4a7edeb2afb17c5f7794ee75e1c2c09113d46415fc7318_s390x",
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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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