CVE-2026-122267 MinIO Signature V4 verification before RELEASE.2026-09-22T19-25-18Z accepts unsigned x-amz-* headers, letting a presigned PUT URL be escalat
High 8.8
Published
Updated
Check this codebase for CVE-2026-122267 and fix it if it is affected.
What it is: CVE-2026-122267 is a high-severity vulnerability in Chainguard MinIO, published on 5 Nov 2026.
Exploitation: There is no known exploitation of CVE-2026-122267 in the wild and no public exploit code.
Affected product: Chainguard MinIO. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-122267/ (Markdown: https://insights.sbomify.com/CVE-2026-122267/index.md)
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-122267?
CVE-2026-122267 is a high-severity vulnerability in Chainguard MinIO, published on 5 Nov 2026.
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.
Weakness: CWE-347
Which versions are affected by CVE-2026-122267?
How do I fix CVE-2026-122267?
No fix has been published for CVE-2026-122267 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-122267 being exploited?
There is no known exploitation of CVE-2026-122267 in the wild and no public exploit code.
Sources
Also known as GHSA-48rv-pgqh-mhjg.