CVE-2026-29050: melange allows users to build apk packages using declarative pipelines

Routine

MEDIUM 6.1UPGRADE

CVE-2026-29050 is a medium-severity flaw (CVSS 6.1) affecting melange. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

melange allows users to build apk packages using declarative pipelines. Starting in version 0.32.0 and prior to version 0.43.4, an attacker who can influence a melange configuration file — for example through pull-request-driven CI or build-as-a-service scenarios — could set `pipeline[].uses` to a value containing `../` sequences or an absolute path. The `(*Compiled).compilePipeline` function in `pkg/build/compile.go` passed `uses` directly to `f

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.1% (top 97%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-04-24
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: chainguard

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-24 00:16 UTCPublished CVE record published
2026-10-26 22:10 UTCUpdated Record last modified

chainguard melange UPGRADE

Affected: >= 0.32.0 and < 0.43.4

Fixed in: 0.43.4

Safe to downgrade to: a release before 0.32.0

1. Check installed version

apt-cache policy melange || rpm -q melange || melange --version

2. UPGRADE to 0.43.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade melange

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade melange

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 0.32.0 (Debian / Ubuntu)

apt-cache madison melange sudo apt install melange=<VERSION_BEFORE_0.32.0> sudo apt-mark hold melange

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list melange sudo dnf downgrade melange-<VERSION_BEFORE_0.32.0> sudo dnf versionlock add melange

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-29050?

melange: upgrade to 0.43.4. Exact commands for each OS are on this page.

Is CVE-2026-29050 being exploited?

CVE-2026-29050 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-29050 affect?

CVE-2026-29050 affects melange. Severity is medium (CVSS 6.1). melange allows users to build apk packages using declarative pipelines. Starting in version 0.32.0 and prior to version 0.43.4, an attacker who can influence a melange configuration file — for example through pull-request-driven CI or build

How urgent is CVE-2026-29050?

Priority 22/100. No elevated risk signals yet.

Related CVEs

CVE-2026-29051 MEDIUM 4.4 UPGRADE melange allows users to build apk packages using declarative pipelines

References

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