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TI-2026-53162 Aliases CVE-2026-75939GHSA-vhqx-cfmx-mjq9

Openshift/oc-mirror: release signature verification: openpgp signatureerror checked before signed body is consumed

Priority LOW 35CWE-347Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · None
Fix status
Partial Red Hat: 1 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-347.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00377 31st percentileScored 2026-11-07
Fix Partial Red Hat: 1 advisoryRed Hat: 1 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat OpenShift Container Platform 4.18—1790828598Patch availableCNA
Red HatRed Hat OpenShift Container Platform 4——Not affectedCNA
Red HatRed Hat OpenShift Container Platform 5——No fix listedCNA
Red HatRed Hat OpenShift Container Platform 5——No fix listedCNA
  • Red Hat OpenShift Container Platform 4.18 VendorRed Hat Affected — Fixed in 1790828598 Patch available CNA
  • Red Hat OpenShift Container Platform 4 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat OpenShift Container Platform 5 VendorRed Hat Affected — Fixed in — No fix listed CNA
  • Red Hat OpenShift Container Platform 5 VendorRed Hat Affected — Fixed in — No fix listed CNA

CPE names CNA · 3

CPEVersionsRoleVendor
cpe:/a:redhat:openshift:4.18::el94.18—Red Hat
cpe:/a:redhat:openshift:44—Red Hat
cpe:/a:redhat:openshift:55—Red Hat
  • cpe:/a:redhat:openshift:4.18::el9 Versions 4.18 — ·Red Hat
  • cpe:/a:redhat:openshift:4 Versions 4 — ·Red Hat
  • cpe:/a:redhat:openshift:5 Versions 5 — ·Red Hat

Remediation

Red Hat 1 advisory

  • RHSA-2026:79039 Released 2026-10-15 · Red Hat rating Important
    OpenShift Container Platform 4.18.57 bug fix and security update
    • Red Hat OpenShift Container Platform 4.18 registry.redhat.io/openshift4/frr-rhel9, registry.redhat.io/openshift4/oc-mirror-plugin-rhel9, registry.redhat.io/openshift4/ose-agent-installer-node-agent-rhel9 +18

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat OpenShift Container Platform 5AffectedNo fix yet
Red Hat OpenShift Container Platform 4.18Fixed RHSA-2026:79039
Not affected: 2 products
  • Red Hat OpenShift Container Platform 4
  • Red Hat OpenShift Container Platform 4.18

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-75939
  2. 2026-10-03 Alias added: GHSA-vhqx-cfmx-mjq9
  3. 2026-10-16 Fix available: openshift4/oc-mirror-plugin-rhel9@1790828598 · CNA
  4. 2026-10-16 1 new reference · CNA
  5. 2026-10-16 Fix available: RHSA-2026:79039 · Red Hat
  6. 2026-10-16 Fix available: Red Hat OpenShift Container Platform 4.18 · Red Hat
  7. 2026-11-06 Affected versions changed · CNA
  8. 2026-11-07 Affected versions changed · Red Hat

References

Advisory 1

Other 2

  • TI-2019-15875 Protection mechanism failure in Jenkins Pipeline: Groovy Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-15874 Protection mechanism failure in Jenkins Script Security Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
  • TI-2019-03949 Out-of-bounds write in ESXi and Horizon DaaS KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8
See all 7413 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences