ESB-2026.4019 — Vulnetix

ESB-2026.4019 PUBLISHED CVSS 8.199999809265137 HIGH

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.4019 Red Hat OpenShift Service Mesh 3.1.7 22 April 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: Red Hat OpenShift Service Mesh 3.1.7 Publisher: Red Hat Operating System: Red Hat Resolution: Patch/Upgrade CVE Names: CVE-2026-33186 CVE-2026-25679 CVE-2026-33747 CVE-2026-33748 CVE-2026-34986 Original Bulletin: https://access.redhat.com/errata/RHSA-2026:9448 Comment: CVSS (Max): 8.2 CVE-2026-33747 (CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H) CVSS Source: Red Hat Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H EPSS (Max): 0.1% (17th) CVE-2026-33747 2026-04-21 - --------------------------BEGIN INCLUDED TEXT-------------------- RHSA-2026:9448 - Security Advisory Issued: 2026-04-21 Updated: 2026-04-21 Synopsis Hat openshift service mesh 3.1.7 Type/Severity Security Advisory: Important Topic Red Hat OpenShift Service Mesh 3.1.7 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. Description Red Hat OpenShift Service Mesh 3.1.7, 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. Fixes/Improvements: Security Fix(es): o istio-rhel9-operator: Incorrect parsing of IPv6 host literals in net/url (CVE-2026-25679) o istio-cni-rhel9: Incorrect parsing of IPv6 host literals in net/url (CVE-2026-25679) o istio-pilot-rhel9: Incorrect parsing of IPv6 host literals in net/url (CVE-2026-25679) o istio-proxyv2-rhel9: Incorrect parsing of IPv6 host literals in net/url (CVE-2026-25679) o istio-proxyv2-rhel9: gRPC-Go: Authorization bypass due to improper HTTP/2 path validation (CVE-2026-33186) o istio-proxyv2-rhel9: BuildKit: Arbitrary file write and code execution via untrusted frontend (CVE-2026-33747) o istio-proxyv2-rhel9: BuildKit: Unauthorized file access via Git URL fragment subdir components (CVE-2026-33748) o istio-cni-rhel9: Go JOSE: Denial of Service via crafted JSON Web Encryption (JWE) object (CVE-2026-34986) o istio-pilot-rhel9: Go JOSE: Denial of Service via crafted JSON Web Encryption (JWE) object (CVE-2026-34986) Bug Fix(es): o OSSM operator metrics reader ClusterRole conflicts with other operators (OSSM-13106) Solution See Red Hat OpenShift Service Mesh 3.1.7 documentation at https:// docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.1 Fixes o OSSM-13106 - OSSM operator metrics reader ClusterRole conflicts with other operators o OSSM-13263 - Add deprication note to OSSM3 FBC CVEs o CVE-2026-25679 o CVE-2026-33186 o CVE-2026-33747 o CVE-2026-33748 o CVE-2026-34986 o CVE-2026-25679 o CVE-2026-33186 o CVE-2026-33747 o CVE-2026-33748 o CVE-2026-34986 References o https://access.redhat.com/security/updates/classification o https://access.redhat.com/security/updates/classification/ - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://portal.auscert.org.au/bulletins/ =========================================================================== AUSCERT The University of Queensland, Brisbane QLD 4072 Australia e: auscert@auscert.org.au t: +61 (0)7 3365 4417 Allies in Cyber Security ===========================================================================

Risk Scores

CVSS v3.1

8.199999809265137

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

Affected Products

Vendor	Product	Versions
Red Hat	Red Hat OpenShift Service Mesh 3.1.7

Timeline

Apr 21, 2026 CVE Published
Apr 22, 2026 Distribution Patch

References

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