CVE-2026-75939

HIGHPre-NVD 7.47.4—
EchelonGraph scoreHIGH confidence

Score 7.4 from GitHub Security Advisory (severity: HIGH) published 2026-09-21. a secondary CVSS source baseline 7.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.4Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.4
EG Score
7.4(high)
EG Risk
33(Track)
EG Risk 33/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity74% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
21%
KEV
Not listed

Published

September 21, 2026

Last Modified

September 24, 2026

Advisory Details (2)

Auto-updated Sep 21, 2026
Patch available. Sources: redhat.
redhat

2517976 – (CVE-2026-75939) CVE-2026-75939 openshift/oc-mirror: Release signature verification: OpenPGP SignatureError checked before signed body is consumed

https://bugzilla.redhat.com/show_bug.cgi?id=2517976
redhat Patch Available

CVE-2026-75939 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-75939

Vendor Advisories for CVE-2026-75939(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 20× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-25 02:35 UTCGHSA enrichment
  2. 2026-09-24 14:34 UTCEG score recompute
  3. 2026-09-24 14:34 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 13:39 UTCEG score recompute
  6. 2026-09-24 13:39 UTCGHSA enrichment
  7. 2026-09-24 07:52 UTCGHSA enrichment
  8. 2026-09-23 19:52 UTCEG score recompute
  9. 2026-09-23 19:52 UTCGHSA enrichment
  10. 2026-09-23 17:54 UTCEPSS rescore
  11. 2026-09-23 07:52 UTCGHSA enrichment
  12. 2026-09-22 19:52 UTCEG score recompute
  13. 2026-09-22 19:52 UTCGHSA enrichment
  14. 2026-09-22 16:01 UTCEPSS rescore
  15. 2026-09-22 15:22 UTCGHSA enrichment
  16. 2026-09-22 03:22 UTCEG score recompute
  17. 2026-09-22 03:22 UTCGHSA enrichment
  18. 2026-09-21 15:22 UTCEG score recompute
  19. 2026-09-21 14:25 UTCEG score recompute
  20. 2026-09-21 14:25 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-75939?
CVE-2026-75939 is a high vulnerability published on September 21, 2026. 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…
When was CVE-2026-75939 disclosed?
CVE-2026-75939 was first published in the National Vulnerability Database on September 21, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-75939 actively exploited?
CVE-2026-75939 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 78.7% of all scored CVEs.
What is the CVSS score of CVE-2026-75939?
CVE-2026-75939 has a CVSS v3 base score of 7.4 (NVD).
How do I remediate CVE-2026-75939?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-75939, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-75939

Explore →

Is Your Infrastructure Affected by CVE-2026-75939?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs