Low [CVE-2026-87055] Base image referenced by mutable tag rather than sha256 digest
This low-severity Red Hat Linux advisory covers CVE-2026-87055.
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Summary
A flaw was found in operator-sdk-builder. The software uses a flexible label, called a mutable tag, to identify its base container image instead of a unique, fixed identifier.
This practice allows the underlying base image to change unexpectedly between builds. Such a change could introduce vulnerabilities or malicious code into the build process, posing a supply chain integrity risk.
This issue has a Low impact as it primarily affects the integrity of the build process rather than introducing a runtime vulnerability in deployed applications. Referencing base images with mutable tags can lead to inconsistent builds if the underlying image changes, potentially introducing unexpected behavior or dependencies.
Red Hat severity: Low — CVSS 2.6 (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:N/A:N). Weakness: CWE-829.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- To mitigate this issue, ensure that the `FROM` line in the `Containerfile` references the base image using an immutable SHA256 digest instead of a mutable tag. For example, update the `FROM` line to `FROM registry.access.redhat.com/ubi9/go-toolset:1.25.5-1770654497@sha256:<digest>`. This practice ensures that the base image remains consistent across builds, improving build integrity. This change requires modifying the `Containerfile` and rebuilding the image.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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