Vulnerability in Coder
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Coder — versions >= 2.34.0, < 2.34.2, >= 2.33.0, < 2.33.8, >= 2.30.0, < 2.32.7
Weakness classification (CWE)
References
- github.com/coder/coder/pull/25710 (Patch, Issue Tracking)
- github.com/coder/coder/releases/tag/v2.29.17 (Release Notes)
- github.com/coder/coder/releases/tag/v2.32.7 (Release Notes)
- github.com/coder/coder/releases/tag/v2.33.8 (Release Notes)
- github.com/coder/coder/releases/tag/v2.34.2 (Release Notes)
- github.com/coder/coder/security/advisories/GHSA-f962-qm93-mj4c (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-55079?
- CVE-2026-55079 is a medium-severity vulnerability in Coder, classified under CWE-789. CVSS score: 4.9/10. Published 2026-07-08.
- How severe is CVE-2026-55079?
- Medium severity. CVSS v3 base score is 4.9 out of 10.