CVE-2026-55079

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.

• github.comhttps://github.com/coder/coder/pull/25710
• github.comhttps://github.com/coder/coder/releases/tag/v2.29.17
• github.comhttps://github.com/coder/coder/releases/tag/v2.32.7
• github.comhttps://github.com/coder/coder/releases/tag/v2.33.8
• github.comhttps://github.com/coder/coder/releases/tag/v2.34.2
• github.comhttps://github.com/coder/coder/security/advisories/GHSA-f962-qm93-mj4c