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CVE-2026-55428— Coder: Route hijacking through lack of validation of agent-supplied AllowedIPs in tailnet coordinator

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存在授权问题漏洞，该漏洞源于尾网协调器仅验证代理的 是否来自其经过身份验证的UUID，而未对 进行等效检查，导致协调器将代理提供的 原样转发至隧道对等节点并配置到WireGuard对等配置中，可能允许授权问题攻击。以下版本受到影响：2.29.17之前版本、2.32.7之前的2.30.x版本、2.33.8之前的2.33.x版本和2.34.2之前的

CVSS 8.2 · High EPSS 0.40% · P32

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
< 2.29.17 affected
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I. Basic Information for CVE-2026-55428

Vulnerability Information
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Vulnerability Title
Coder: Route hijacking through lack of validation of agent-supplied AllowedIPs in tailnet coordinator
Source: CVE Program / CVE List V5
Vulnerability Description
Coder allows organizations to provision remote development environments via Terraform. Prior to versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2, the tailnet coordinator validates that an agent's `Addresses` derive from its authenticated UUID but applies no equivalent check to `AllowedIPs`. The coordinator forwards agent-supplied `AllowedIPs` verbatim to tunnel peers which install them into the WireGuard peer configuration. The fix in versions 2.29.7, 2.32.7, 2.33.8, and 2.34.2 validates each `AllowedIPs` prefix against the authenticating agent's UUID just like `Addresses`. As a workaround, monitor coordinator logs for agents advertising unexpected `AllowedIPs` prefixes.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Coder 授权问题漏洞
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存在授权问题漏洞，该漏洞源于尾网协调器仅验证代理的`Addresses`是否来自其经过身份验证的UUID，而未对`AllowedIPs`进行等效检查，导致协调器将代理提供的`AllowedIPs`原样转发至隧道对等节点并配置到WireGuard对等配置中，可能允许授权问题攻击。以下版本受到影响：2.29.17之前版本、2.32.7之前的2.30.x版本、2.33.8之前的2.33.x版本和2.34.2之前的
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-2026-55428

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III. Intelligence Information for CVE-2026-55428

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Patches & Fixes for CVE-2026-55428 (1)

Vendor Advisories for CVE-2026-55428 (1)

Vendor Pages for CVE-2026-55428 (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-2026-44454 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-2026-55078 6.5 MEDIUM Coder: Zip upload decompression lacks aggregate size limit, enabling denial of service
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-285

V. Comments for CVE-2026-55428

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