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CVE-2026-29049— melange: unbounded HTTP download in `melange update-cache` can exhaust disk in CI

Quick assessment

Affected
chainguard-dev melange
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

melange是Chainguard开源的一个从源代码构建APK的软件。 melange 0.40.5及之前版本存在代码问题漏洞，该漏洞源于melange update-cache通过io.Copy下载构建配置中的URI时无大小限制或HTTP客户端超时，可能导致攻击者控制的URI引发无限制磁盘写入，从而耗尽构建运行器的磁盘空间。

CVSS 4.3 · Medium EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
chainguard-dev melange < 0.43.4 affected
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I. Basic Information for CVE-2026-29049

Vulnerability Information
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Vulnerability Title
melange: unbounded HTTP download in `melange update-cache` can exhaust disk in CI
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
melange 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
melange是Chainguard开源的一个从源代码构建APK的软件。 melange 0.40.5及之前版本存在代码问题漏洞，该漏洞源于melange update-cache通过io.Copy下载构建配置中的URI时无大小限制或HTTP客户端超时，可能导致攻击者控制的URI引发无限制磁盘写入，从而耗尽构建运行器的磁盘空间。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
chainguard-dev melange < 0.43.4 -

II. Public POCs for CVE-2026-29049

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III. Intelligence Information for CVE-2026-29049

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Patches & Fixes for CVE-2026-29049 (2)

Vendor Advisories for CVE-2026-29049 (1)

Vendor Pages for CVE-2026-29049 (1)

IV. Related Vulnerabilities

Same product: melange
Same vendor: chainguard-dev
Same weakness: CWE-400

V. Comments for CVE-2026-29049

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