How severe is CVE-2026-29049?

CVE-2026-29049 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-29049 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-29049?

CVE-2026-29049 affects Chainguard Melange. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-29049?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-29049 have an EU (EUVD) identifier?

Yes. CVE-2026-29049 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10015.

When was CVE-2026-29049 published?

CVE-2026-29049 was published on 2026-03-06 and last updated on 2026-07-07.

CVE-2026-29049

CVE-2026-29049 is a medium-severity vulnerability in Chainguard Melange with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (13th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-10015
Weakness: CWE-400
Affected product: Chainguard Melange
Published: 2026-03-06
Last modified: 2026-07-07

Description

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.

Frequently asked questions

What is CVE-2026-29049?: 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.
How severe is CVE-2026-29049?: CVE-2026-29049 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-29049 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (13th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-29049?: CVE-2026-29049 affects Chainguard Melange. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-29049?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-29049 have an EU (EUVD) identifier?: Yes. CVE-2026-29049 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-10015.
When was CVE-2026-29049 published?: CVE-2026-29049 was published on 2026-03-06 and last updated on 2026-07-07.

References

Affected products (1)

cpe:2.3:a:chainguard:melange:*:*:*:*:*:go:*:*

More vulnerabilities in Chainguard Melange

CVE-2026-24843 — High (CVSS 8.2): melange allows users to build apk packages using declarative pipelines. In version 0.11.3 to before 0.40.3, an attacker…
CVE-2026-24844 — High (CVSS 7.9): melange allows users to build apk packages using declarative pipelines. From version 0.3.0 to before 0.40.3, an…
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CVE-2026-29051 — Medium (CVSS 4.4): melange allows users to build apk packages using declarative pipelines. Starting in version 0.32.0 and prior to version…

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