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CVE-2026-54174

melange: Incomplete package integrity verification allows data section substitution

melange allows users to build apk packages using declarative pipelines. Apko prior to version 1.2.9, corresponding to melange prior to version 0.50.4, verified the control section hash (`.PKGINFO` etc.) against the signed `APKINDEX`, but never verified the data section hash (the actual package files that get installed). An attacker who could compromise a mirror, poison a cache, or MITM a package fetch could substitute arbitrary file contents while the control hash check still passed. Apko version 1.2.9 and melange version 0.50.4 contain a fix.

CVSS 3.1 · 8.3 High EPSS < 1% KEV · Not listed
Vendors
Chainguard-dev
Products
Apko Melange
CVE-2026-29049

melange: unbounded HTTP download in `melange update-cache` can exhaust disk in CI

melange allows users to build apk packages using declarative pipelines. In version 0.40.5 and prior, melange update-cache downloads URIs from build configs via io.Copy without any size limit or HTTP client timeout (pkg/renovate/cache/cache.go). An attacker-controlled URI in a melange config can cause unbounded disk writes, exhausting disk on the build runne. Version 0.43.4 contains a patch.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Vendors
Chainguard Chainguard-dev
Products
Melange Melange
CVE-2026-25145

melange has a path traversal in license-path which allows reading files outside workspace

melange allows users to build apk packages using declarative pipelines. From version 0.14.0 to before 0.40.3, an attacker who can influence a melange configuration file (e.g., through pull request-driven CI or build-as-a-service scenarios) could read arbitrary files from the host system. The LicensingInfos function in pkg/config/config.go reads license files specified in copyright[].license-path without validating that paths remain within the workspace directory, allowing path traversal via ../ sequences. The contents of the traversed file are embedded into the generated SBOM as license text, enabling exfiltration of sensitive data through build artifacts. This issue has been patched in version 0.40.3.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed
Vendors
Chainguard Chainguard-dev
Products
Melange Melange
CVE-2026-24843

melange QEMU runner could write files outside workspace directory

melange allows users to build apk packages using declarative pipelines. In version 0.11.3 to before 0.40.3, an attacker who can influence the tar stream from a QEMU guest VM could write files outside the intended workspace directory on the host. The retrieveWorkspace function extracts tar entries without validating that paths stay within the workspace, allowing path traversal via ../ sequences. This issue has been patched in version 0.40.3.

CVSS 3.1 · 8.2 High EPSS < 1% KEV · Not listed
Vendors
Chainguard Chainguard-dev
Products
Melange Melange
CVE-2026-24844

melange pipeline working-directory could allow command injection

melange allows users to build apk packages using declarative pipelines. From version 0.3.0 to before 0.40.3, an attacker who can provide build input values, but not modify pipeline definitions, could execute arbitrary shell commands if the pipeline uses ${{vars.*}} or ${{inputs.*}} substitutions in working-directory. The field is embedded into shell scripts without proper quote escaping. This issue has been patched in version 0.40.3.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Chainguard Chainguard-dev
Products
Melange Melange
CVE-2026-25143

melange affected by potential host command execution via license-check YAML mode patch pipeline

melange allows users to build apk packages using declarative pipelines. From version 0.10.0 to before 0.40.3, an attacker who can influence inputs to the patch pipeline could execute arbitrary shell commands on the build host. The patch pipeline in pkg/build/pipelines/patch.yaml embeds input-derived values (series paths, patch filenames, and numeric parameters) into shell scripts without proper quoting or validation, allowing shell metacharacters to break out of their intended context. The vulnerability affects the built-in patch pipeline which can be invoked through melange build and melange license-check operations. An attacker who can control patch-related inputs (e.g., through pull request-driven CI, build-as-a-service, or by influencing melange configurations) can inject shell metacharacters such as backticks, command substitutions $(…), semicolons, pipes, or redirections to execute arbitrary commands with the privileges of the melange build process. This issue has been patched in version 0.40.3.

CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
Vendors
Chainguard Chainguard-dev
Products
Melange Melange