RHSA-2026:26231
Vulnerability from csaf_redhat - Published: 2026-06-16 09:27 - Updated: 2026-09-05 21:40Summary
Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.2.6
Severity
Important
Notes
Topic: Red Hat OpenShift Service Mesh 3.2.6
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 3.2.6, 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 3.2:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:0c8b094d37be696f55f4a7f3bacc89df0d7d8758ef726aa4cced8c675cedd893_s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:566720d2683ddc21de68ec4a7d06998565a5b307328b62188c00a859aa01416a_amd64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:f9ad974659eaa7fb581635dc7dec5f7e561d12f39ca11fef16b416fc9634a964_ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:fdab7c58feb092e4e4adcbb95c2375bdfd76fb9702539e7b92577c8197282364_arm64 | — |
Vendor Fix
fix
Workaround
|
Known not affected
21 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:57c22050e27874f142225cb52a3cfb48662749fa11badfaefe35c27e9cf6b9d7_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:7a82b4f882835509f53e3f60b395d7e58956ff4158a7ab77a78cc34835624e72_s390x | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:86f9149a3246121ec96d3413eb056617530f00808552637a291f27a800932556_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:a63c47511101e2fc22f051a057a0b5307a0a546a706e6b4042d7f483ed8e368c_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:22fb322dad667f097805440d5f2a9427156a4b3bbc8fe9a2ed3466dbeef3f2f7_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:23e9fbe6e6ea11e832c7f5dba42a6647468b782cacd4e1605e7ac9566cae6108_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:243ebdfcec4c9a5f856112061407632d8a3463f9a22f4b8196ba23bc978d4147_s390x | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:616a5e991ed54c8dc00b999dcedd8866fb7ded4d739079470fd306cdee4612b2_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:6a98519e5624a785b905790c9714764fc6ddd8ae4027716929397f6f8f5d8fda_s390x | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:bbdae8c7762d0028990a39ae19e39ff27a4d484563525c7c5f6f446409f2fc1a_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:f3159b0735f7f25b40b246634e4bf40b668a4ab8d9318d3c0499150b00486a34_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:fe03415d573ef8d4f907795255cec3f61dcc6d864401b6cd7aa45f1685f3b08d_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:3b72a06f6d0bc5a74107c7edb87af64e1878779a09946d72e6b5f181bf0f0a27_arm64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:3cd40ea42fc8ac197bd3f54b4e799b4e294e14081c73b9d6011bf50b08bdff59_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:8387e7640fb308b1da2ec996a1367d8da3c9a1d6b8b51a4a4c5255acd5c1cca9_s390x | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:e61db9b8fb75e91717ebe5819e04212aa71b65c9e098ad800c9b03f82c38704f_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-sail-operator-bundle@sha256:83ffcd8afe730203afd97713292fb56e29a120b6296d03439c0e8e8cf3013186_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:0c76e3710d2b156ab849a801cdfd9d4af713bf05928968a290e2e23ea7bfc6da_ppc64le | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:485865eb1b84b371b8584b05833a4f46267cd6ae7d748d9420cf3211fa67b513_amd64 | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:a8482ac8a8eb9a7e8f06abc2f8808089ac657425c6b497ab0a16a6d45780aeed_s390x | — |
Workaround
|
|
| Unresolved product id: Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:cfb768203c4fdd29e8229db912e47bc381dcd3841cfad9ae592461dc6b99fba5_arm64 | — |
Workaround
|
Threats
Impact
Important
References
9 references
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{
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"notes": [
{
"category": "description",
"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"
},
{
"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 3.2:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:fdab7c58feb092e4e4adcbb95c2375bdfd76fb9702539e7b92577c8197282364_arm64"
],
"known_not_affected": [
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"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:7a82b4f882835509f53e3f60b395d7e58956ff4158a7ab77a78cc34835624e72_s390x",
"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:86f9149a3246121ec96d3413eb056617530f00808552637a291f27a800932556_ppc64le",
"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:a63c47511101e2fc22f051a057a0b5307a0a546a706e6b4042d7f483ed8e368c_amd64",
"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:22fb322dad667f097805440d5f2a9427156a4b3bbc8fe9a2ed3466dbeef3f2f7_arm64",
"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:23e9fbe6e6ea11e832c7f5dba42a6647468b782cacd4e1605e7ac9566cae6108_ppc64le",
"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:243ebdfcec4c9a5f856112061407632d8a3463f9a22f4b8196ba23bc978d4147_s390x",
"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:616a5e991ed54c8dc00b999dcedd8866fb7ded4d739079470fd306cdee4612b2_amd64",
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"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:f3159b0735f7f25b40b246634e4bf40b668a4ab8d9318d3c0499150b00486a34_arm64",
"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:fe03415d573ef8d4f907795255cec3f61dcc6d864401b6cd7aa45f1685f3b08d_ppc64le",
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"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:3cd40ea42fc8ac197bd3f54b4e799b4e294e14081c73b9d6011bf50b08bdff59_ppc64le",
"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:8387e7640fb308b1da2ec996a1367d8da3c9a1d6b8b51a4a4c5255acd5c1cca9_s390x",
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"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-sail-operator-bundle@sha256:83ffcd8afe730203afd97713292fb56e29a120b6296d03439c0e8e8cf3013186_amd64",
"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:0c76e3710d2b156ab849a801cdfd9d4af713bf05928968a290e2e23ea7bfc6da_ppc64le",
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"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:a8482ac8a8eb9a7e8f06abc2f8808089ac657425c6b497ab0a16a6d45780aeed_s390x",
"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:cfb768203c4fdd29e8229db912e47bc381dcd3841cfad9ae592461dc6b99fba5_arm64"
]
},
"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": "2026-06-16T09:27:21+00:00",
"details": "See Red Hat OpenShift Service Mesh 3.2.6 documentation at https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.2",
"product_ids": [
"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:0c8b094d37be696f55f4a7f3bacc89df0d7d8758ef726aa4cced8c675cedd893_s390x",
"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:566720d2683ddc21de68ec4a7d06998565a5b307328b62188c00a859aa01416a_amd64",
"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:f9ad974659eaa7fb581635dc7dec5f7e561d12f39ca11fef16b416fc9634a964_ppc64le",
"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:fdab7c58feb092e4e4adcbb95c2375bdfd76fb9702539e7b92577c8197282364_arm64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:26231"
},
{
"category": "workaround",
"details": "See the security bulletin for a detailed mitigation procedure.",
"product_ids": [
"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:57c22050e27874f142225cb52a3cfb48662749fa11badfaefe35c27e9cf6b9d7_arm64",
"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:7a82b4f882835509f53e3f60b395d7e58956ff4158a7ab77a78cc34835624e72_s390x",
"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:86f9149a3246121ec96d3413eb056617530f00808552637a291f27a800932556_ppc64le",
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"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:22fb322dad667f097805440d5f2a9427156a4b3bbc8fe9a2ed3466dbeef3f2f7_arm64",
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"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:a8482ac8a8eb9a7e8f06abc2f8808089ac657425c6b497ab0a16a6d45780aeed_s390x",
"Red Hat OpenShift Service Mesh 3.2:registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:cfb768203c4fdd29e8229db912e47bc381dcd3841cfad9ae592461dc6b99fba5_arm64"
]
}
],
"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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