Coder: Zip upload decompression lacks aggregate size limit, enabling denial of service

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Summary

CVECVE-2026-55078
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-07 23:16:55 UTC
Updated2026-07-08 19:45:05 UTC
DescriptionCoder 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`.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.006020000 probability, percentile 0.445910000 (date 2026-07-09)

Problem Types: CWE-409 | CWE-770 | CWE-409 CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Coder Coder All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Coder Coder affected >= 2.34.0, < 2.34.2 Not specified
CNA Coder Coder affected >= 2.33.0, < 2.33.8 Not specified
CNA Coder Coder affected >= 2.30.0, < 2.32.7 Not specified
CNA Coder Coder affected >= 2.17.0, < 2.29.17 Not specified

References

ReferenceSourceLinkTags
github.com/coder/coder/releases/tag/v2.34.2 [email protected] github.com Release Notes
github.com/coder/coder/releases/tag/v2.29.17 [email protected] github.com Release Notes
github.com/coder/coder/security/advisories/GHSA-2mg2-p7r7-g27f [email protected] github.com Patch, Vendor Advisory
github.com/coder/coder/pull/25877 [email protected] github.com Issue Tracking, Patch
github.com/coder/coder/releases/tag/v2.32.7 [email protected] github.com Release Notes
github.com/coder/coder/releases/tag/v2.33.8 [email protected] github.com Release Notes
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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