Vulnerability · Published Nov 5, 2026 · Assigned by chainguard
CVE-2026-122267
High 8.8
In plain English
A high-severity security flaw in MinIO from Chainguard. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).
Severity (CVSS 4.0)8.8High
Exploit odds (30 days)0.2%top 90.2% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
MinIO Signature V4 verification before RELEASE.2026-09-22T19-25-18Z accepts unsigned x-amz-* headers, letting a presigned PUT URL be escalated into a cross-bucket read.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Chainguard | MinIO | 0 – through RELEASE.2026-09-21T00-15-41Z |
Weakness: CWE-347 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N