CVE-2026-55078
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
Coder allows organizations to provision remote development environments via Terraform. Starting in version 2.17.0 and prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, POST /api/v2/files converts zip uploads to tar in memory via CreateTarFromZip, which enforced a per-entry size limit but no aggregate limit on total decompressed output, writing to an unbounded in-memory buffer. Exploitation requires authenticated file-upload access and the impact is limited to availability (denial of service). The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 adds a metadata preflight check that sums projected entry sizes and a streaming writer that enforces the aggregate limit during decompression. As a workaround, restrict file-upload permissions to trusted users or place a reverse proxy with request-body size limits in front of coderd.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| coder | coder | >= 2.34.0, < 2.34.2 | affected |
| coder | coder | >= 2.33.0, < 2.33.8 | affected |
| coder | coder | >= 2.30.0, < 2.32.7 | affected |
| coder | coder | >= 2.17.0, < 2.29.17 | affected |
Weaknesses
- CWE-409: CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)
- CWE-770: CWE-770: Allocation of Resources Without Limits or Throttling
References
- https://github.com/coder/coder/security/advisories/GHSA-2mg2-p7r7-g27f
- https://github.com/coder/coder/pull/25877
- https://github.com/coder/coder/releases/tag/v2.29.17
- https://github.com/coder/coder/releases/tag/v2.32.7
- https://github.com/coder/coder/releases/tag/v2.33.8
- https://github.com/coder/coder/releases/tag/v2.34.2
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