RH
Product
Red Hat OpenShift Container Platform 4.21
by Red Hat · last CVE Oct 14, 2026
On CISA KEVExploited in the wild
80
CVEs
1
On KEV
10.0
Max CVSS
6
New 30D
Severity mix
Critical 14High 57Medium 9Low 0
Watch

Add Red Hat OpenShift Container Platform 4.21 to your stack to get only the CVEs that touch what you run.

CVECVSSEPSSPublishedSummary · affected versions
CVE-2026-45736
7.5
1%
May 15
ws: Uninitialized memory disclosure
Affected: All versions, or not specified
CVE-2026-39820
7.5
1%
May 7
Quadratic string concatentation in consumeComment in net/mail
Affected: All versions, or not specified
CVE-2026-42499
7.5
1%
May 7
Quadratic string concatenation in consumePhrase in net/mail
Affected: All versions, or not specified
CVE-2026-33814
7.5
1%
May 7
Infinite loop in HTTP/2 transport when given bad SETTINGS_MAX_FRAME_SIZE in net/http/internal/http2 in golang.org/x/net
Affected: All versions, or not specified
CVE-2026-41674
7.5
1%
May 7
xmldom: XML injection through unvalidated DocumentType serialization
Affected: All versions, or not specified
CVE-2026-6322
7.5
1%
May 5
fast-uri vulnerable to host confusion via percent-encoded authority delimiters
Affected: All versions, or not specified
CVE-2026-42154
7.5
1%
May 4
Prometheus: remote read endpoint allows denial of service via crafted snappy payload
Affected: All versions, or not specified
CVE-2026-42151
7.5
0%
May 4
Prometheus Azure AD remote write OAuth client secret exposed via config API
Affected: All versions, or not specified
CVE-2026-43003
7.5
1%
May 1
An issue was discovered in OpenStack ironic-python-agent 1.0.0 through 11.5.0
Affected: All versions, or not specified
CVE-2026-42039
7.5
1%
Apr 24
Axios: unbounded recursion in toFormData causes DoS via deeply nested request data
Affected: All versions, or not specified
CVE-2026-40895
7.5
0%
Apr 21
follow-redirects: Custom Authentication Headers Leaked to Cross-Domain Redirect Targets
Affected: All versions, or not specified
CVE-2026-32283
7.5
1%
Apr 8
Unauthenticated TLS 1.3 KeyUpdate record can cause persistent connection retention and DoS in crypto/tls
Affected: All versions, or not specified
CVE-2026-34986
7.5
1%
Apr 6
Go JOSE affect by a panic in JWE decryption
Affected: All versions, or not specified
CVE-2026-50236
7.4
0%
Aug 11
Openshift/console: authenticated ssrf with full response reflection and path neutralization via dev console webhook helpers in openshift console
Affected: All versions, or not specified
CVE-2026-50237
7.4
0%
Aug 11
Openshift/console: namespace tenant ssrf with egress bypass, catalog poisoning, and admin-mediated supply chain escalation via projecthelmchartrepository in openshift console
Affected: All versions, or not specified
CVE-2026-42033
7.4
1%
Apr 24
Axios: Prototype Pollution Gadgets - Response Tampering, Data Exfiltration, and Request Hijacking
Affected: All versions, or not specified
CVE-2026-75886
7.2
0%
Sep 23
Openshift/console: openshift/console: unauthenticated reverse proxy to in-cluster catalogd service with session token forwarding
Affected: All versions, or not specified
CVE-2026-96577
7.1
0%
Oct 1
Oc-mirror__release-4.21: embedded local cache registry listens on all interfaces without authentication, with delete enabled
Affected: All versions, or not specified
CVE-2026-87114
7.1
0%
Sep 28
Kube-compare: container:// reference extraction runs the image entrypoint and silently escalates to sudo
Affected: All versions, or not specified
CVE-2026-46243
7.1
0%
Jun 1
smb: client: reject userspace cifs.spnego descriptions
Affected: All versions, or not specified
CVE-2025-54518
7.0
0%
May 15
Improper isolation of shared resources within the CPU operation cache on Zen 2-based products could allow an attacker to corrupt instructions executed at a different privilege…
Affected: All versions, or not specified
CVE-2026-27145
6.5
1%
Jun 2
Inefficient candidate hostname parsing in crypto/x509
Affected: All versions, or not specified
CVE-2026-42965
6.5
0%
May 29
Openshift/router: openshift/router: cloud metadata ssrf via fqdn-typed endpointslice bypasses destination validation
Affected: All versions, or not specified
CVE-2026-1933
6.5
1%
May 27
Samba: missing access check on reparse point operations
Affected: All versions, or not specified
CVE-2026-42041
6.5
1%
Apr 24
Axios: Authentication Bypass via Prototype Pollution Gadget in `validateStatus` Merge Strategy
Affected: All versions, or not specified
CVE-2026-35469
6.5
1%
Apr 16
SpdyStream: DOS on CRI
Affected: All versions, or not specified
CVE-2026-83589
6.1
0%
Oct 1
Oauth-proxy: open redirect via /\ and /\t bypass in post-login redirect
Affected: All versions, or not specified
CVE-2026-42338
6.1
0%
May 12
ip-address: XSS in Address6 HTML-emitting methods
Affected: All versions, or not specified
CVE-2025-13465
5.3
2%
Jan 21
Prototype Pollution Vulnerability in Lodash _.unset and _.omit functions
Affected: All versions, or not specified
CVE-2026-40175
4.8
2%
Apr 10
Axios has Unrestricted Cloud Metadata Exfiltration via Header Injection Chain
Affected: All versions, or not specified
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