Build-time code execution via malicious dependency
Published Aug 21, 2026 · Updated Aug 21, 2026
Embedded malicious code in David Roundy's internment 0.8.7 allows remote attackers to execute code during a dependent project's build. Its injected proc-macro1 dependency runs build.rs, disables TLS certificate validation, downloads a platform payload, and launches it detached. Compilation alone triggers execution with the build user's privileges; the library API need not be called, and the payload can establish command-and-control access.
Summary
What happened
Embedded malicious code in David Roundy's internment 0.8.7 allows remote attackers to execute code during a dependent project's build. Its injected proc-macro1 dependency runs build.rs, disables TLS certificate validation, downloads a platform payload, and launches it detached. Compilation alone triggers execution with the build user's privileges; the library API need not be called, and the payload can establish command-and-control access.
The record
- CVE
- CVE-2026-77649
- Published
- Aug 21, 2026
- Updated
- Aug 21, 2026
- Vendor
- David Roundy
- Product
- internment
- Classifications
- CWE-506, CAPEC-442, T1195.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 20, 2026Exploitation reportedinternment-to-proc-macro1 build-time payload chain
- Aug 21, 2026CVE publishedPublication date reported by the CVE source.
- Aug 21, 2026Record 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=0.8.7
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
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Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Reported exploitation
- internment-to-proc-macro1 build-time payload chainexploit chain
Technologies
Your stack
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Your stack
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