Security readout for executives and security teams
Plain-English summary
This flaw lets a user who can write Kubernetes EndpointSlices in OpenShift make the router contact a cloud metadata service. If successful, the router could expose instance credentials or sensitive metadata. The issue is serious because it targets infrastructure credentials, but the source bundle does not show active exploitation or fixed versions.
Executive priority
Treat as high priority for cloud-hosted OpenShift clusters. The main business risk is credential disclosure from instance metadata, which could enable broader cloud account or workload compromise. Prioritize RBAC review and vendor patch tracking.
Technical view
CVE-2026-42965 is a CWE-918 SSRF in OpenShift Router. FQDN-typed EndpointSlices can resolve to cloud metadata endpoints and bypass prior destination IP validation, causing the router to proxy requests to sensitive metadata services. Red Hat rates it High with CVSS 3.1 score 7.7.
Likely exposure
Exposure is limited to Red Hat OpenShift Container Platform 4 deployments using the affected router packages, especially cloud-hosted clusters where metadata endpoints can return credentials. Risk depends on who or what can create or modify EndpointSlices.
Exploitation context
The described attack requires EndpointSlice write access. The CVSS vector indicates network attack, low complexity, low privileges, no user interaction, changed scope, and high confidentiality impact. The bundle marks KEV false and provides no cited evidence of active exploitation.
Researcher notes
The bundle names affected Red Hat OpenShift 4 router packages but does not provide fixed versions, exploit reports, or detailed mitigations. Analysis should remain anchored to Red Hat CVE, Bugzilla, CSAF VEX, and the CVE record.
Mitigation direction
- Check Red Hat guidance for fixed router images or advisories.
- Prioritize updates for openshift4/ose-haproxy-router packages when available.
- Review and minimize RBAC grants allowing EndpointSlice write access.
- Monitor router egress attempts to cloud metadata endpoints.
- Investigate suspicious FQDN EndpointSlices in application namespaces.
Validation and detection
- Identify OpenShift Container Platform 4 clusters in cloud environments.
- Inventory router image/package versions against Red Hat CVE guidance.
- List subjects with EndpointSlice create, update, or patch permissions.
- Review EndpointSlices with FQDN endpoint types.
- Check logs for router requests toward metadata endpoint hostnames or IPs.
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-918: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCloud metadata behavior lookup
The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupContainer behavior lookup
The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-42965 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.7 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N3.14redhatCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N3.14redhat-SADPVulnerability scoring details
Base CVSS 3.1 score
7.7HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Base CVSS 3.1 score
7.7HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- ADP timelineredhat-SADP
Reported to Red Hat.
- ADP timelineredhat-SADP
Made public.
- Source timelineredhat
Reported to Red Hat.
- Source timelineredhat
Made public.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-04-17T21:46:19.000Z: Reported to Red Hat.
- 2026-04-17T21:46:19.000Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- https://access.redhat.com/security/cve/CVE-2026-42965CVE reference, redhat · vdb-entry, x_refsource_REDHAT
- RHBZ#2483184CVE reference, redhat · issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42965.jsonCVE reference, redhat-SADP · x_sadp-csaf-vex
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Server-Side Request Forgery (SSRF)
Server-Side Request Forgery (SSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.