EUVD-2026-38374Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Remote unauthenticated flood against a default endpoint (AV:N/AC:L/PR:N/UI:N); availability of DB tier is the primary impact (A:H), with minor integrity from table bloat (I:L) and no confidentiality loss.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2DescriptionCVE.org
Capgo before 12.128.2 contains a rate limit bypass vulnerability in the channel_self endpoint that allows attackers to circumvent rate limiting by rotating the user-controlled device_id parameter. Attackers can send multiple requests per second by changing device_id values to flood the channel_devices table and cause database exhaustion.
AnalysisAI
Rate-limit bypass in Capgo versions prior to 12.128.2 lets remote unauthenticated attackers flood the channel_self endpoint by rotating the client-supplied device_id parameter, defeating per-device throttling. Sustained abuse writes unbounded rows into the channel_devices table, exhausting database resources and degrading or denying service to legitimate users. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Network reachability to the Capgo channel_self endpoint of a Capgo deployment running a version earlier than 12.128.2; no authentication, no user interaction, and no non-default configuration are required because device_id is a normal client-supplied parameter on this endpoint. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N) correctly reflects that exploitation is remote, low-complexity, and requires no authentication or user interaction, and VA:H captures the availability hit on the database tier. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker scripts a loop that POSTs to the Capgo channel_self endpoint while incrementing or randomizing the device_id field on each request, sending thousands of requests per second from a single host without ever tripping the per-device rate limit. Each request inserts a new row into channel_devices; within minutes the table grows large enough to degrade query performance, exhaust connection pools, or fill disk, denying OTA update service to every application relying on that Capgo instance. |
| Remediation | Upgrade Capgo to version 12.128.2 or later, which is the vendor-released patch referenced in GHSA-77p2-9rcr-5w27 (https://github.com/Cap-go/capgo/security/advisories/GHSA-77p2-9rcr-5w27). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all systems running Capgo versions prior to 12.128.2 and assess network exposure of the channel_self endpoint. …
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External POC / Exploit Code
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