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CVE-2026-55078— Coder: Zip upload decompression lacks aggregate size limit, enabling denial of service

Quick assessment

Affected
coder coder
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Coder是Coder组织开源的一个可以在公共或私有云基础设施中设置开发环境的应用程序。 Coder存在资源管理错误漏洞，该漏洞源于 接口在处理zip上传转换为tar时，未对总解压输出设置聚合大小限制，导致写入无界内存缓冲区，可能导致拒绝服务。以下版本受到影响：2.17.0版本至2.29.17之前版本、2.30.0版本至2.32.7之前版本、2.33.0版本至2.33.8之前版本和2.34.0版本至2.34.2之前版本。

CVSS 6.5 · Medium EPSS 0.60% · P47

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 4

VendorProduct Version RangeStatus
coder coder >= 2.34.0, < 2.34.2 affected
>= 2.33.0, < 2.33.8 affected
>= 2.30.0, < 2.32.7 affected
>= 2.17.0, < 2.29.17 affected
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I. Basic Information for CVE-2026-55078

Vulnerability Information
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Vulnerability Title
Coder: Zip upload decompression lacks aggregate size limit, enabling denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
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`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
Coder 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Coder是Coder组织开源的一个可以在公共或私有云基础设施中设置开发环境的应用程序。 Coder存在资源管理错误漏洞，该漏洞源于`/api/v2/files`接口在处理zip上传转换为tar时，未对总解压输出设置聚合大小限制，导致写入无界内存缓冲区，可能导致拒绝服务。以下版本受到影响：2.17.0版本至2.29.17之前版本、2.30.0版本至2.32.7之前版本、2.33.0版本至2.33.8之前版本和2.34.0版本至2.34.2之前版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
coder coder >= 2.34.0, < 2.34.2 -

II. Public POCs for CVE-2026-55078

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III. Intelligence Information for CVE-2026-55078

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Patches & Fixes for CVE-2026-55078 (1)

Vendor Advisories for CVE-2026-55078 (1)

Vendor Pages for CVE-2026-55078 (4)

Same Patch Batch · coder · 2026-07-07 · 12 CVEs total

CVE-2026-46354 9.1 CRITICAL Coder: PKCS#7 signature bypass in Azure instance identity allows unauthenticated agent tok
CVE-2026-55427 8.3 HIGH Coder vulnerable to SSH config injection via unsanitized server-supplied values in `coder
CVE-2026-55428 8.2 HIGH Coder: Route hijacking through lack of validation of agent-supplied AllowedIPs in tailnet
CVE-2026-44454 8.1 HIGH Coder vulnerable to workspace auto-creation via crafted URL parameters without user consen
CVE-2026-55075 7.4 HIGH Coder vulnerable to OIDC account takeover via email-based user matching and email_verified
CVE-2026-55076 7.4 HIGH Coder's OIDC email_verified type coercion bypass enables account takeover via unverified e
CVE-2026-55077 7.2 HIGH Coder: User-admin role can reset owner account password
CVE-2026-55434 6.5 MEDIUM Coder vulnerable to denial of service via unbounded request body in AI Bridge provider end
CVE-2026-45796 6.5 MEDIUM Coder vulnerable to unauthenticated SSRF via Azure Instance Identity Endpoint
CVE-2026-55435 5.4 MEDIUM Suspended Coder users retain access to AI Bridge LLM proxy endpoints
CVE-2026-55079 4.9 MEDIUM Coder's unbounded memory allocation in provisioner file upload allows authenticated denial

IV. Related Vulnerabilities

Same product: coder
Same vendor: coder
Same weakness: CWE-409

V. Comments for CVE-2026-55078

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