Host file disclosure via symlink-mounted container builds
Published Mar 31, 2025 · Updated Oct 14, 2025
Path traversal in AWS SAM CLI 1.98.0 through 1.132.0 allows remote attackers to read host files through container builds. The container volume builder resolves source symlinks with os.path.realpath and mounts each target without checking that it remains inside the build directory. Exploitation requires a victim to run a Docker-backed build on an attacker-controlled project; its build script can read files available to the elevated Docker process.
Summary
What happened
Path traversal in AWS SAM CLI 1.98.0 through 1.132.0 allows remote attackers to read host files through container builds. The container volume builder resolves source symlinks with os.path.realpath and mounts each target without checking that it remains inside the build directory. Exploitation requires a victim to run a Docker-backed build on an attacker-controlled project; its build script can read files available to the elevated Docker process.
The record
- CVE
- CVE-2025-3047
- Published
- Mar 31, 2025
- Updated
- Oct 14, 2025
- Vendor
- Amazon Web Services
- Product
- AWS SAM CLI
- Classifications
- CWE-61, T1005
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 31, 2025CVE publishedPublication date reported by the CVE source.
- Oct 14, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.98.0 <1.133.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- GitHub Security Lab GHSL-2025-030 reproductionproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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