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Capgo CVE-2026-56248

| EUVDEUVD-2026-38431 HIGH
Uncontrolled Resource Consumption (CWE-400)
2026-06-23 VulnCheck GHSA-rp66-wcx8-j4pj
Denial Of Service PostgreSQL Capgo
8.7
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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
vuln.today AI
7.5 HIGH

Network-reachable PostgREST endpoint usable with the public anon key, no auth or interaction, only availability impacted via DB resource exhaustion.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Jun 23, 2026 - 14:17 EUVD
Analysis Generated
Jun 23, 2026 - 13:04 vuln.today
CVE Published
Jun 23, 2026 - 12:12 cve.org
HIGH 8.7

DescriptionCVE.org

Cap-go capgo (capgo-backend) before 12.128.12 contains an unauthenticated denial-of-service vulnerability arising from the audit_logs table's Row-Level Security (RLS) policy when accessed via the Supabase PostgREST API. Because the PostgreSQL query planner executes costly logic before RLS rejection, unfiltered queries to the public.audit_logs endpoint using the public anon key consistently trigger statement timeouts (PostgREST error 57014). Under concurrency, this exhausts database resources and causes cascading HTTP 500 failures on unrelated endpoints (e.g. /orgs), resulting in an application-layer denial of service.

AnalysisAI

Unauthenticated denial of service in Cap-go capgo (capgo-backend) before 12.128.12 allows remote attackers to exhaust PostgreSQL resources by sending unfiltered queries to the public.audit_logs PostgREST endpoint using the public anon key. Because the query planner runs expensive logic before Row-Level Security rejection, repeated requests trigger statement timeouts (error 57014) and cascade into HTTP 500 failures on unrelated endpoints such as /orgs. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain public anon key from Capgo client
Delivery
Send concurrent GET /rest/v1/audit_logs requests
Exploit
Planner executes costly logic before RLS rejection
Execution
statement_timeout 57014 saturates DB workers
Persist
Cascading HTTP 500s on /orgs and other endpoints
Impact
Application-layer denial of service
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Vulnerability AssessmentAI

Exploitation Exploitation requires only that the target run a Capgo backend before 12.128.12 with the default audit_logs RLS policy reachable through Supabase PostgREST, and that the attacker possess the Supabase anon key, which is intentionally public and embedded in the Capgo client. … 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 with VA:H accurately reflects a trivially reachable, high-availability-impact flaw: any client holding the publicly distributed anon key can issue the request, and concurrency amplifies the effect to unrelated endpoints. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker extracts the publicly embedded Supabase anon key from any Capgo-powered mobile app or the Capgo web client, then scripts concurrent GET requests against https://<capgo-host>/rest/v1/audit_logs. Each request stalls until statement_timeout fires, and within seconds connection-pool and CPU pressure cause unrelated endpoints like /orgs to return HTTP 500, taking the update-delivery API offline for legitimate client devices.
Remediation Vendor-released patch: upgrade capgo-backend to 12.128.12 or later, as documented in GHSA-5vgv-rqj5-5748 (https://github.com/Cap-go/capgo/security/advisories/GHSA-5vgv-rqj5-5748) which rewrites the audit_logs RLS policy so the anon role is rejected before the expensive query plan executes. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

24 hours: Inventory all Cap-go capgo-backend instances and identify those running versions before 12.128.12; enable detailed logging and monitoring on the public.audit_logs PostgREST endpoint for anomalous query patterns. …

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CVE-2026-56248 vulnerability details – vuln.today
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