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CVE-2026-55428
8.2 HIGH
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): High (H)
- Privileges Required (PR): Low (L)
- User Interaction (UI): None (N)
- Scope (S): Changed (C)
- Confidentiality (C): High (H)
- Integrity (I): High (H)
- Availability (A): None (N)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): High (H)
- Modified Privileges Required (MPR): Low (L)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): High (H)
- Modified Scope (MS): Changed (C)
- Modified Integrity (MI): High (H)
- Modified Availability (MA): None (N)
Activity log
- Created & dismissed (max. allowed matches exceeded) suggestion
Coder: Route hijacking through lack of validation of agent-supplied AllowedIPs in tailnet coordinator
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.
References
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https://github.com/coder/coder/security/advisories/GHSA-wrq8-fcv5-8hvp x_refsource_CONFIRM
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https://github.com/coder/coder/pull/26144 x_refsource_MISC
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https://github.com/coder/coder/releases/tag/v2.29.17 x_refsource_MISC
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https://github.com/coder/coder/releases/tag/v2.32.7 x_refsource_MISC
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https://github.com/coder/coder/releases/tag/v2.33.8 x_refsource_MISC
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https://github.com/coder/coder/releases/tag/v2.34.2 x_refsource_MISC
Affected products
coder
- ==>= 2.33.0, < 2.33.8
- ==>= 2.30.0, < 2.32.7
- ==< 2.29.17
- ==>= 2.34.0, < 2.34.2