TI-2026-20307 Aliases CVE-2026-25145 GHSA-2w4f-9fgg-q2v9

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

LOW 24CWE-22Published 2026-02-04 · Updated 2026-02-05

Key facts

Attack vector: Local
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-22 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00191 8th percentileScored 2026-11-07

Fix Fixed melange (chainguard-dev): 0.40.3chainguard.dev/melange (Go): 0.40.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
chainguard-dev	melange	0.14.0 to before 0.40.3	0.40.3	Patch available	CNA
—	chainguard.dev/melange (Go)	0.14.0 to before 0.40.3	0.40.3	Patch available	GHSA-2w4f-9fgg-q2v9

melange Vendorchainguard-dev Affected 0.14.0 to before 0.40.3 Fixed in 0.40.3 Patch available CNA
chainguard.dev/melange (Go) Vendor— Affected 0.14.0 to before 0.40.3 Fixed in 0.40.3 Patch available GHSA-2w4f-9fgg-q2v9

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:chainguard:melange::::::go::*	0.14.0 to before 0.40.5	Vulnerable	chainguard-dev

cpe:2.3:a:chainguard:melange:*:*:*:*:*:go:*:* Versions 0.14.0 to before 0.40.5 Vulnerable ·chainguard-dev

Remediation

Fix · CNA melange (chainguard-dev) Fixed in 0.40.3
Fix · GHSA-2w4f-9fgg-q2v9 chainguard.dev/melange (Go) Fixed in 0.40.3 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-25145
2026-10-03 Alias added: GHSA-2w4f-9fgg-q2v9

References

Patch 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-25145

Other 1

https://github.com/chainguard-dev/melange

TI-2026-20043 melange pipeline working-directory could allow command injection CVSS 3.1HIGH 8.8
TI-2026-20042 melange QEMU runner could write files outside workspace directory CVSS 3.1HIGH 8.4
TI-2026-20305 melange affected by potential host command execution via license-check YAML mode patch pipeline CVSS 3.1HIGH 7.8
TI-2026-23195 melange has Path Traversal When Resolving External Pipelines via Unvalidated pipeline[].uses CVSS 3.1MEDIUM 6.1
TI-2026-23196 melange has Path Traversal via .PKGINFO in --persist-lint-results CVSS 3.1MEDIUM 4.4
TI-2026-23194 melange: unbounded HTTP download in `melange update-cache` can exhaust disk in CI CVSS 3.1MEDIUM 4.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences