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CVE-2026-55078
Published:July 07, 2026
Updated:July 21, 2026
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 Packages
github.com/coder/coder/v2 (GO):
Affected version(s) >=v2.17.0 <v2.29.17
Fix Suggestion:
Update to version v2.29.17
github.com/coder/coder/v2 (GO):
Affected version(s) >=v2.34.0 <v2.34.2
Fix Suggestion:
Update to version v2.34.2
github.com/coder/coder/v2 (GO):
Affected version(s) >=v2.33.0 <v2.33.8
Fix Suggestion:
Update to version v2.33.8
github.com/coder/coder/v2 (GO):
Affected version(s) >=v2.30.0 <v2.32.7
Fix Suggestion:
Update to version v2.32.7
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CVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Allocation of Resources Without Limits or Throttling
Improper Handling of Highly Compressed Data (Data Amplification)
EPSS
Base Score:
0.60