CVE-2026-55079
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Summary
Coder allows organizations to provision remote development environments via Terraform. Starting in version 2.24.0 and prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, NewDataBuilder in provisionersdk/proto/dataupload.go allocated a byte slice using the client-supplied FileSize from a DataUpload message without an upper-bound check. Although the DRPC wire limit is 4 MiB, the FileSize value itself was unconstrained. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 validates FileSize against an upper bound (MaxFileSize = 100 MiB) before allocation. As a workaround, restrict access to the provisioner daemon serve endpoint to trusted provisioner daemon service accounts.
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 | >= 2.24.0, < 2.29.17 | affected |
Weaknesses
- CWE-789: CWE-789: Memory Allocation with Excessive Size Value
References
- https://github.com/coder/coder/security/advisories/GHSA-f962-qm93-mj4c
- https://github.com/coder/coder/pull/25710
- 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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