RHSA-2026:26222
Vulnerability from csaf_redhat - Published: 2026-06-16 08:59 - Updated: 2026-09-05 21:41Summary
Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.1.9
Severity
Important
Notes
Topic: Red Hat OpenShift Service Mesh 3.1.9
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 3.1.9, 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 3.1:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:18b5e5e2b3a8f74d40c18bbd58e84c8031e0eacfeadb9532d6e4a02dab0b1056_s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:1c296024f2ec78190d8ce84f8e84819f84376c1047026952a1cd2fc4948c4090_arm64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:6991e2da2e80b475a074d5d6f88d369218f3f0685da9cf1681fff832f732332d_amd64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:d959a970e9e8f3abdeac805802d98a1974e6c564fee39871cfe9ccaa2660ae75_ppc64le | — |
Vendor Fix
fix
Workaround
|
Known not affected
21 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh-tech-preview/istio-ztunnel-rhel9@sha256:9ce34e666db0e2233e6c7cd8abec6f1ff1666e280a066121dbdc88fdee5ee8f5_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh-tech-preview/istio-ztunnel-rhel9@sha256:a6e721cec618a366f6e637eef207e5ac9b1df5b28bf143602f2e650c225a9596_s390x | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh-tech-preview/istio-ztunnel-rhel9@sha256:d3147f84726a242fb2607b8f90180a6d369fe6bb2c36185da738482e21e35078_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh-tech-preview/istio-ztunnel-rhel9@sha256:edd134df753b3489efc2193c51c86f0412f54ea55a9f206cfd06019a62c73d7a_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:1320da6136d8524476a1336673f89f8299d8fce9bf4a7890e78e358acc68a600_s390x | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:32fb5e53668e0872180d83bc00476a59c249ec22b80f688d79949fab487122ac_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:4777696dc53510105af1752f853171546afc636f7153f31044659dc4d619b401_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:4b4ef260ada8181e6214bada86f09f4eca5bbab4bad89c905ce09178780f23d9_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:12d10ab7c35446cb17cc5d62b6c24a8d01a70c96f6ff8987007f0a833b869d8f_s390x | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:2a53a1ae23f9233c53e64b8184662f2d7d01ef87a6faca95523c020792772812_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:3773a5dd56eeddc0cefcc17be4db773c6149192e7acab0dd6d313bb2cbd98034_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:fa628f1f7283aac46894322071880035672f7190b48321fd24575b15f591d510_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:0d296152d81a70b3bc20d85e96d2bf8c47cac0ee36993018cdba702c79e8d4cf_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:2e87fc0db414d7b20ca471225ee9f4f7e3e8d6b0d73758bb787f938452b9fef8_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:57cfcd3e3202d88981379ced33bac62bb1dc2da57bb9de5c4b7c1b2005d9fd6d_s390x | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:9198bc607d1c1fdce35760015751103c9746a25444f2507d3f6ab452bb564ce4_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:3b7ce5c040e508387ac72012147a6c6c76fcf1be0b8132219eafd92ec4e3d995_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:3ba2aa7c56993a908ca5a92b828d0bdfe05cbd99cace53e2879425b0bb750fa0_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:4e8b65eb6ff94ee67449fbde63f7800dfece156139fa2facd851f0190bc85f85_s390x | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:98741c91d31acc5f8ffceafe6ec78031044e67b272f7bc3613f9121f5d63401f_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-sail-operator-bundle@sha256:ad9538959ca5035ec315dbb597343b67dab3979417fc3003e77888f1a8ed7827_amd64 | — |
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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"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 3.1:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:6991e2da2e80b475a074d5d6f88d369218f3f0685da9cf1681fff832f732332d_amd64",
"Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:d959a970e9e8f3abdeac805802d98a1974e6c564fee39871cfe9ccaa2660ae75_ppc64le"
],
"known_not_affected": [
"Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh-tech-preview/istio-ztunnel-rhel9@sha256:9ce34e666db0e2233e6c7cd8abec6f1ff1666e280a066121dbdc88fdee5ee8f5_amd64",
"Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh-tech-preview/istio-ztunnel-rhel9@sha256:a6e721cec618a366f6e637eef207e5ac9b1df5b28bf143602f2e650c225a9596_s390x",
"Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh-tech-preview/istio-ztunnel-rhel9@sha256:d3147f84726a242fb2607b8f90180a6d369fe6bb2c36185da738482e21e35078_ppc64le",
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"Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:1320da6136d8524476a1336673f89f8299d8fce9bf4a7890e78e358acc68a600_s390x",
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"Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:2a53a1ae23f9233c53e64b8184662f2d7d01ef87a6faca95523c020792772812_amd64",
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"Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:fa628f1f7283aac46894322071880035672f7190b48321fd24575b15f591d510_ppc64le",
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"Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:57cfcd3e3202d88981379ced33bac62bb1dc2da57bb9de5c4b7c1b2005d9fd6d_s390x",
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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": "2026-06-16T08:59:03+00:00",
"details": "See Red Hat OpenShift Service Mesh 3.1.9 documentation at https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.1",
"product_ids": [
"Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:18b5e5e2b3a8f74d40c18bbd58e84c8031e0eacfeadb9532d6e4a02dab0b1056_s390x",
"Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:1c296024f2ec78190d8ce84f8e84819f84376c1047026952a1cd2fc4948c4090_arm64",
"Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:6991e2da2e80b475a074d5d6f88d369218f3f0685da9cf1681fff832f732332d_amd64",
"Red Hat OpenShift Service Mesh 3.1:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:d959a970e9e8f3abdeac805802d98a1974e6c564fee39871cfe9ccaa2660ae75_ppc64le"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:26222"
},
{
"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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