CVE-2026-75939— Openshift/oc-mirror: release signature verification: openpgp signatureerror checked before signed body is consumed
Quick assessment
Affected
Red Hat Red Hat OpenShift Container Platform 4
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
A flaw was found in openshift/oc-mirror. The tool incorrectly verifies PGP (Pretty Good Privacy) release image signatures by checking for signature errors before the entire signed body is processed, leading to a bypass of the signature verification. A remote a
Affected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat OpenShift Container Platform 4 | any |
unaffected |
any |
affected |
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I. Basic Information for CVE-2026-75939
Vulnerability Information
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Vulnerability Title
Openshift/oc-mirror: release signature verification: openpgp signatureerror checked before signed body is consumed
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in openshift/oc-mirror. The tool incorrectly verifies PGP (Pretty Good Privacy) release image signatures by checking for signature errors before the entire signed body is processed, leading to a bypass of the signature verification. A remote attacker, by intercepting or manipulating network traffic to the signature endpoint, could exploit this to craft a PGP message with a valid Red Hat release key ID but a forged signature. This enables the `oc-mirror` tool to accept and mirror a malicious release payload into a disconnected registry, potentially compromising the integrity of software deployments.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat OpenShift Container Platform 4 | - |
cpe:/a:redhat:openshift:4
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 | - |
cpe:/a:redhat:openshift:4
|
|
II. Public POCs for CVE-2026-75939
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-75939 (2)
Same Patch Batch · Red Hat · 2026-09-21 · 13 CVEs total
| CVE-2026-92574 | 8.8 HIGH | Cri-o: cri-o checkpoint restore bypasses destination security context |
| CVE-2026-80110 | 8.1 HIGH | Pki-core: dogtag pki v2 rest acl filter's reverse-lexicographic tie-break lets a ca agent |
| CVE-2026-15801 | 8.0 HIGH | Cri-o: cri-o: insufficient validation during container checkpoint restore |
| CVE-2026-94449 | 7.5 HIGH | Quarkus-smallrye-fault-tolerance: quarkus-smallrye-fault-tolerance: memory leak in @applyg |
| CVE-2026-94368 | 7.1 HIGH | Noobaa-core: noobaa-core: presigned put url escalation to copyobject via unsigned x-amz-co |
| CVE-2026-94215 | 5.5 MEDIUM | Keycloak-services: keycloak-services: cross-realm client read/write via request-level cach |
| CVE-2026-93433 | 5.5 MEDIUM | Libstoragemgmt: libstoragemgmt: denial of service via stack buffer overflow in scsi vpd pa |
| CVE-2026-94213 | 4.9 MEDIUM | Keycloak-services: keycloak-services: authorization services policy evaluation endpoint le |
| CVE-2026-92382 | 4.1 MEDIUM | Usbredir: usbredir: unbounded iso_packet_desc[] index in usbredirhost_iso_packet() leads t |
| CVE-2026-94217 | 3.5 LOW | Keycloak-services: keycloak-services: uma scope merge across resource owners via resource |
| CVE-2026-94218 | 3.1 LOW | Keycloak-services: keycloak-services: 2fa setup enforcement bypass via authentication sess |
| CVE-2026-94184 | Fetchmail: fetchmail: stack-based buffer overflow in ntlm authentication (fetchmail-sa-202 |
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